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Keyspan High Speed USB Serial Adapter Serial adapter - USB

RS-232, Serial, External

Looking for a way to connect your serial devices to a USB port on your PC? The Keyspan "High Speed" USB Serial Adapter is a simple, inexpensive, and reliable way to make this connection. The Adapter is ideal for use with modems, digital cameras, ISDN terminal adapters, graphics tablets, PDAs, bar code scanners, label printers and other serial devices, which require an RS-232 connection. This "High Speed" USB Serial Adapter supports data rates up to 230 Kbps - twice the speed ... Read more
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User reviews and opinions

<== Click here to post a new opinion, comment, review, etc.

Comments to date: 10. Page 1 of 1. Average Rating:
davevink 11:46am on Saturday, October 30th, 2010 
What a amazing quality camera it is with lots of features. Sensor 8.0 million effective pixels 8.3 million photo detectors 1/1.
The Jakester 10:21pm on Thursday, October 7th, 2010 
The products received were as described. They work very well. The prices were fair, and the shipping is far less expensive than any other site. Fabulous LG widescreen monitor. Bright and clear. Love it. Unfortunately I only used it for 2 weeks.
XRumer879 10:23pm on Thursday, September 16th, 2010 
I previously had the LG 194WT hooked up to my system, and as a photographer I need what I edit to look the same as when it gets printed. I have nothing bad to say about this monitor. It has a beautiful picture for gaming and video.
mcar 9:28am on Thursday, September 16th, 2010 
pc gets new lease of life with this monitor After trawling the net for 19" monitors with DVI connectivity for under 150 quid. Awesome quality and value for money What a superb monitor. Great clarity and resolution. Rock solid on DVI input. POOR AFTER SALE SERVICE After I recieved the screen I noticed a white dot on the bottom right hand side.
yuraj 8:32am on Thursday, August 26th, 2010 
Terrific monitor. Especially at this price point. Refurbished + 2 year warranty= 1 Happy Customer. Picture is clear. No setup required, used it right out of the box. Product arrived promptly and condition was as stated on Overstock. Overall.
GopherMouse 9:55pm on Monday, July 19th, 2010 
Great LCD display I purchase one of these about 6 months ago and was so pleased with it I bought another one for my son.
drstrangelove 7:08pm on Saturday, July 17th, 2010 
POOR AFTER SALE SERVICE After I recieved the screen I noticed a white dot on the bottom right hand side.
tomaso 4:25am on Wednesday, July 14th, 2010 
Jer This monitor is very sharp, bright, very good picture. Fast motion pictures come across clean and clear. I would recommend it. Great monitor, but.... I bought this monitor less than a year ago to replace a CRT that finally crapped out after 8 years of use.
GauqdtasWVWerndes 8:55pm on Friday, June 25th, 2010 
The Flatron W2252TQ makes using a computer feel more like a privilege than a task and if anything is a little big for the average user.
rsgibson 6:57am on Saturday, May 15th, 2010 
The average LCD have really low contrast ratio this one does not playing wow and other games Halo3 hehe look very good one of the better moniters i ha...

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Documents

doc0

Keyspan:USB Serial Adapter for Windows-v3.4 Manual

Table of Contents

Introduction Capabilities Installation Instructions Configuring Your Serial Device Keyspan Serial Assistant Problem Solving Appendices Frequently Asked Questions (FAQs) Compatibility List for Windows Configuration Examples for Windows Serial Port Pin Outs LED Behavior TX Ack Advance Notices Keyspan Warranty Information Support Information
This User Manual applies to the Keyspan USB Serial Adapter Software for Windows. Rev 03jul13 Page 1

1.1 - Introduction

Looking for a way to connect your serial devices to a USB port on your USB equipped Windows computer? The Keyspan USB Serial Adapter is a simple, inexpensive, and reliable way to make this connection. The Adapter plugs into any USB port on your PC. It provides one DB9 serial port which can be used to connect to your Palm Organizer, WindowsCE device, Wacom tablet, and many other serial devices. Multiple Keyspan USB Serial Adapters may be installed on one CPU if desired.

Requirements

The Keyspan USB Serial Adapter Software for Windows requires the following: Windows: At least one available USB port Windows 98 / 98 SE / 98 Me / 2000 / XP

Contents

The Keyspan USB Serial Adapter package includes: Keyspan USB Serial Adapter (USA-19H) USB cable Mac and Windows compatible CD with software and user manual
Note: This documentation applies to Keyspan's USB Serial Adapter Software for Windows and covers the features and use of this software on that platform. For information and instructions for this product on other platforms, please visit Keyspan's web page <http://www.keyspan.com>.
This User Manual applies to the Keyspan USB Serial Adapter Software for Windows. Rev 03jul13 Page 2

2.1 - Capabilities

The Keyspan USB Serial Adapter provides one male DB9 serial port which supports RS-232 asynchronous communications at data rates up to 230 Kbps. Please read our Compatibility List for Windows for a list of serial devices that have been tested with the Keyspan USB Serial Adapter.
Keyspan USB Serial Adapter Port
Keyspan USB Serial Adapter Serial Port
The DB9 port on the Keyspan Adapter is seen as a COM port by Windows. The Keyspan COM port is interfaced via the "Win32 Communications API" and is then available to any program that accesses COM ports via this API. By default, the COM port number assigned to the Keyspan adapter is the first unassigned (available) COM port number in the Windows registry. For example, if COM1 and COM2 have already been assigned or set aside by any software or hardware, the Keyspan adapter will take the next COM port (COM3). This COM port number can then be accessed via your serial device's software (ie Palm's HotSync Manager, Wacom tablet control panel, etc.)
Note: You can connect more than one Keyspan USB Serial Adapter to your USB equipped Windows computer. The DB9 ports on subsequent adapters will have a different COM port numbers.
This User Manual applies to the Keyspan USB Serial Adapter Software for Windows. Rev 03jul13 Page 3
3.1 - Installation Instructions
Installing the USB Serial Adapter Software for Windows Operating Systems
Note: These instructions apply to installing the Keyspan USB Serial Adapter on Windows. If you are installing this software on other platforms, please read the Keyspan USB Serial Software User Manual for that platform.
Step 1 - Insert the Keyspan Serial Adapter CD-ROM
Turn your computer ON. When your computer starts up, place the Keyspan USB Serial Adapter CD into the CD-ROM drive. This will open the Keyspan USB Serial Adapter CD browser (Note: you can manually start the CD browser by locating and running the "Launch.exe" program on the CD-ROM).
Step 2 - Run the Keyspan USB Serial Software for Windows Installer
If the Keyspan Adapter is connected to your computer, disconnect it now. Once the Keyspan CD browser has opened, click on the "Install Software" selection and then click on the "Install Keyspan USA19H Software" selection. This will start the software installer. Follow the instructions on-screen to complete the installation.
Step 3 - Software Installation Complete!
Now that you have installed the Keyspan USB Serial Adapter software, you are ready to install the Keyspan USB Serial Adapter hardware. Please proceed to the installing the Keyspan USB Serial Adapter Hardware instructions.
(continued on next page.)
This User Manual applies to the Keyspan USB Serial Adapter Software for Windows. Rev 03jul13 Page 4
Installing the Keyspan USB Serial Adapter Hardware

This User Manual applies to the Keyspan USB Serial Adapter Software for Windows. Rev 03jul13 Page 6
Step 3 - Check the Keyspan Serial Assistant
Now that your serial device is connected to the Keyspan adapter, you should check to see if the Keyspan serial port is installed correctly. To do this, open the Keyspan Serial Assistant (in Start menu -> Programs -> Keyspan USB Serial Adapter -> Keyspan Serial Assistant). When you open the Keyspan Serial Assistant, you will see the following window:
the Keyspan Serial Assistant window
If your Keyspan hardware and software are installed correctly, you will see your adapter in the 'Adapter Status' tab box. You should also see the COM port number (ie COM1, COM2, etc.) and the COM Port Status.(IDLE or BUSY). The COM port number and its COM port Status message are very important to configuring your serial device. The COM port Status is the state of the Keyspan serial port. All serial ports have two states, BUSY (aka "In Use") or IDLE (aka "Available"). When serial port is IDLE, the port is available for use by any serial device's software. When a COM port is BUSY, the serial port is in use by software and therefore not available to other programs. The COM port number is the address of the Keyspan serial port. In order for any serial device to communicate via the Keyspan adapter, that serial device's software must be told to use the Keyspan COM port number. If you see your COM port number and its COM port Status, proceed to Step 4. If you do not see either of these items, proceed Problem Solving section in this manual.
This User Manual applies to the Keyspan USB Serial Adapter Software for Windows. Rev 03jul13 Page 7
Step 4 - Determine Where To Select/Configure The Keyspan Serial Port(s)
Prior to using your serial device with a Keyspan serial port, you must first tell that serial device's software which serial port your serial device hardware is connected to. For example, if you have a Palm, you will have to tell the Palm Desktop software to look for your Palm handheld (hardware) on a Keyspan serial port. By doing this, you establish communication between your serial device's software (ie the Palm Desktop software) and your serial device hardware (the Palm handheld unit). Most serial devices will have software that will allow you to select which serial port the device is connected to. Depending on your serial device and its software, you may have to configure: a Control Panel (ie modems accessing ISPs), an application (ie UPSes), or some combination of these (ie modems accessing terminals using Zterm). Please refer to your serial devices documentation on which method your serial device uses and how to access that software's serial port "configuration" screen. Once you've determined where to select or configure your serial device's software's serial port settings, please proceed to Step 5.

Step 5 - Determine Which Serial Port To Select In Your Serial Device's Software
When you've found the port selection screen in your serial device's software, you may be presented with a list of COM port numbers, a place to type in a COM port number, or some combination of both. At this point, you have to select or enter COM port number of the Keyspan serial adapter you are connecting to. Please note that you can see the COM port number in the Adapter Status tab in the Keyspan Serial Assistant.
Step 6 - Use Your Serial Device
Once you've configured your serial software to use the Keyspan serial port, you're ready to start using your serial device under Windows.
This User Manual applies to the Keyspan USB Serial Adapter Software for Windows. Rev 03jul13 Page 8
5.1 - Keyspan Serial Assistant
Besides the required drivers, the Keyspan USB Serial Adapter software installer installs an application called Keyspan Serial Assistant. This application is used to: Determine the status of the adapter software and hardware Assist in problem solving
Launching the Keyspan Serial Assistant
To launch the Assistant, open the Keyspan Serial Assistant (in Start menu -> Programs -> Keyspan USB Serial Adapter -> Keyspan Serial Assistant). When you open the Keyspan Serial Assistant, you will see the following window:
If your Keyspan hardware and software are installed correctly, you will see your adapter in the 'Adapter Status' tab box. You should also see the COM port number (ie COM1, COM2, etc.) and the COM Port Status.(IDLE or BUSY). If you see your COM port number and its COM port Status. If you do not see either of these items, proceed Problem Solving section in this manual.
Explanation of Assistant Features
The following is a description of all the relevant text boxes and menus found in the Keyspan Serial Assistant. You can also obtain this information by turning on the 'Enable Tool Tips' check box in the Help tab in the Assistant window.
(continued on next page.) This User Manual applies to the Keyspan USB Serial Adapter Software for Windows. Rev 03jul13 Page 9

Adapter Status Tab

the Adapter Status tab
The Adapter Status tab in the Keyspan Serial Assistant displays the status of your Keyspan adapter. Specifically, it shows the COM port number (ie COM1, COM2, etc.) and the COM Port Status.(IDLE or BUSY). If you have several Keyspan adapters of the same type, they will all show up in this tab. This is also the first place to check to see if your Keyspan adapter is working properly. If your Keyspan adapter does not show up in the Adapter Status tab, please proceed Problem Solving section in this manual for further instructions.

the Test Type box

The Test Type box allows to specify how many times the selected test will be repeated when you press the Test button. Use the Quick option to perform the test once. To perform a subsequent test, press the Test This Port button. Use the Continuous option to repeat the test continuously. To stop the test, press the Stop Test button (the Test This Port button becomes the Stop Test button during a test).
the Test Speed pull down menu
The Test Speed pull down menu allows to specify the speed (baud rate) at which the port will be tested at when you press the Test This Port button button.
the Test Status box reports
The Test Status box reports the test status or results of the selected COM port.
the Receive FIFO Buffer Size pull down menu
The Receive FIFO Buffer Size pull down menu allows you to configure the number of characters which are stored in the card's "First In First Out" input buffer ("FIFO") before they are made available to the computer. The default value of this parameter is "16". The Receive FIFO improves the reliability of data transfer at high speeds. You can turn this option OFF for performance reasons however this is not necessary in most cases.
the Update Configuration button
The Update Configuration button updates the Keyspan adapter with the changes you have made in the Properties tab. Please note that these changes will take effect when you click the Update Configuration button.
This User Manual applies to the Keyspan USB Serial Adapter Software for Windows. Rev 03jul13 Page 13

Port Mapping Tab

the Port Mapping tab
The Port Mapping tab in the Keyspan Serial Assistant allows you to change how COM port numbers are assigned to your Keyspan adapter. The following is an explanation of the items in this tab.
Important!!! Please make sure you read this entire section. Changing COM port assignments may render other hardware unusable.

the COM Port List box

The COM Port List box shows any connected Keyspan USB Serial Adapter, its COM port number and COM port status. You can also see any other COM port that have been assigned or reserved on your computer if you enable or check the Show All COM Assignment check box.
the Show All COM Assignments check box
Enable or check the Show All COM Assignments check box to display ALL of the COM port name and numbers that have been registered on your computer. This will include COM ports for other devices.
This User Manual applies to the Keyspan USB Serial Adapter Software for Windows. Rev 03jul13 Page 14
Note: You may have COM ports assigned or 'set aside' for hardware that may not be installed on your computer depending on how your computer was setup by its manufacturer.
the COM port mapping pull down menu
The COM port mapping pull down menu allows you to reassign the selected Keyspan COM port in the COM port list window. This window also reports whether a COM port is 'in use'. In this menu, 'in use' means that the selected COM port has assigned or reserved. It is highly recommended that you only change the COM port mapping to COM ports that are not 'in use'.

Note: The COM port mapping pull down menu allows you to change the COM port mapping to any COM port including those that have already been assigned (aka in use). Changing the COM port mapping to a COM port that is in use may render any hardware and/or software using that port inoperable.
the Adapter Port Mapping Mode box
The Adapter Port Mapping Mode box allows you to change the behavior of how Keyspan COM port numbers are assigned when you connect the Keyspan adapter to a different USB port than the one it was originally connected to. Dynamic assigns a COM port number (or numbers if your Keyspan adapter has multiple serial ports) to a particular Keyspan adapter. If you disconnect the Keyspan adapter and connect it to a different USB port, the COM port number of that Keyspan adapter will not change. This is the default setting and is recommended setting if you only have one Keyspan adapter. Geographic assigns a COM port number (or numbers if your Keyspan adapter has multiple serial ports) to a particular USB port on your computer. If you disconnect the Keyspan adapter and connect it to a different USB port, the COM port number of that Keyspan adapter will change. This setting is recommended if you are using multiple Keyspan adapters and want the COM port numbers to remain the same.
(continued on next page.) This User Manual applies to the Keyspan USB Serial Adapter Software for Windows. Rev 03jul13 Page 15
the Delete All Keyspan USB Serial Adapter Port Mappings button
The Delete All Keyspan USB Serial Adapter Port Mappings button clears the Windows registry of all Keyspan USB Serial Adapter COM port numbers and Keyspan USB information. This allows Windows to create new COM port assignments.
Note: that this is an option for advanced users only. If you are unsure about how this command will affect your computer, please contact Keyspan Tech Support for further assistance.
This User Manual applies to the Keyspan USB Serial Adapter Software for Windows. Rev 03jul13 Page 16

Diagnostics Tab

the Diagnostics tab
The Diagnostic tab in the Keyspan Serial Assistant reports diagnostic information about your Keyspan adapter's software and hardware. This information is useful if you are trying to solve problems with Keyspan's technical support staff. The following is an explanation of the items in this tab.
the Adapter Status/Error log Log Window
The Adapter Status / Error Events box displays the status of your Keyspan adapter hardware and software. It detects if the Keyspan driver is installed and whether or not a Keyspan adapter is connected.

This User Manual applies to the Keyspan USB Serial Adapter Software for Windows. Rev 03jul13 Page 20
Keyspan:USB Serial Adapter for Windows-v3.4 Manual If you see the COM port number and have properly selected the Keyspan port that your serial device is connected to and are still having problems, please continue to Step 4.
Step 4 - Use Your Serial Device
If you have followed all of the above steps and are still having problems with your Keyspan USB Serial Adapter, contact Keyspan Tech Support for further assistance.

When You Need More Help.

The Keyspan web site http://www.keyspan.com is your best source for technical support information. The web site includes technical notes, reference manual updates, and answers to frequently asked questions. You may also contact our technical support department directly via email, phone, or fax. Please see the Support Information section in this manual for more details.
This User Manual applies to the Keyspan USB Serial Adapter Software for Windows. Rev 03jul13 Page 21
7.1 - Appendices Frequently Asked Questions (FAQs)
Frequently Asked Questions
Compatibility List for Windows
List of serial devices that have been tested with Keyspan serial adapters.
Configuration Examples for Windows
Instructions on configuring select serial devices to use Keyspan serial ports

Serial Port Pin Outs

Serial Port Pin Out and Loopback Test Information

LED Behavior

Description of the LED Behavior on your Keyspan Adapter

TX Ack Advance

White Paper on the TX Ack Advance feature

Notices

FCC, CE, VCCI, Copyright and Trademark Information
Keyspan Warranty Information
Keyspan Warranty Information

Support Information

Information about obtaining technical support
This User Manual applies to the Keyspan USB Serial Adapter Software for Windows. Rev 03jul13 Page 22
7.1.a - Frequently Asked Questions (FAQs)
The following is a list of Frequently Asked Questions (FAQs) about the Keyspan USB Serial Adapter for Windows. Keyspan frequently updates and adds the questions and answers list below. For the latest list, please visit the our web site at: http://www.keyspan.com

Frequently Asked Question List

Question:

How do I configure my serial device to recognize the Keyspan USB Serial Adapter?

Answer:

To configure any serial device to use a serial port on any Keyspan USB Serial Adapter, you must: 1. Locate the software that controls your serial device. 2. Access that software's port or connection configuration screen/dialog/menu/etc. 3. Select the Keyspan port that your device is connected to in port or connection configuration screen/dialog/menu/etc. for that device Depending on what type of serial device you have, you may have to configure a control panel, an application, or a plug-in. Keyspan provides documentation on how to configure many popular serial devices in the Configuration Examples for Windows appendix in this manual.
Can I connect my Keyspan USB device to a USB hub?
Yes, any Keyspan USB device can be connected to a USB hub. However, there are some USB hubs that cannot fully support some USB devices. If you are having problems with a Keyspan USB device that is connected to a USB hub, please connect the Keyspan USB device to a built-in USB port on your computer. If this solves the problem, then this may be an issue with your USB hub. If you are encountering this problem or something similar to it, please contact Keyspan Tech Support for further instructions.
This User Manual applies to the Keyspan USB Serial Adapter Software for Windows. Rev 03jul13 Page 23
7.1.b - Compatibility List for Windows
The following is a list of serial devices that have been tested with various Keyspan Serial Products on Windows. This list is intended to be used as reference guide and not as complete compatibility list. We are constantly testing products and adding them to this list. Although compatibility testing of the Keyspan USB Serial Adapter software has been focused on modems and Palm PDAs, most Windows (98 and greater) compatible serial devices are compatible with the Keyspan USB Serial Adapter. For the latest version of this list, please visit our web site at: http://www.keyspan.com For the compatibility list for other operating system (ie Mac OS, Mac OS X, etc.), please refer to the user manual for that platform or visit our web site at: http://www.keyspan.com
Legend Y N ! = = = = = = = See Notes section at end of list Configuration Guide Available Not Tested Compatible Not Compatible See Guide for Information not compatible with Operating System

Compatibility List for Windows
Product Graphic Tablets Wacom Tablets
USA19Qi USA19H USA19Q USA19QW USA49WLC USA19 USA19W USA49W
PDAs and PDA Software Palm Psion Revo Sharp Wizard Compaq Aero Y Y Y Y Y Y Y Y Y Y Y Y
This User Manual applies to the Keyspan USB Serial Adapter Software for Windows. Rev 03jul13 Page 24
Casio PV 400 Series RIM Blackberry Royal Vista Windows CE PDAs (all models) ActiveSync

Y Y Y Y

Y Y Y Y Y
Other Devices and Software C-Pen Olympus Digital Cameras Modems (serial) N N N Y Y Y Y Y Y
Compatibility List for Windows - Notes

RIM Blackberry

USA19 - If you have a Keyspan USB PDA Adapter, model number USA-19, the Blackberry Desktop Manager v2.1 is not able to communicate with Keyspan USB PDA Adapter with the model number of USA-19 due to a bug in the Desktop Manager. The currently shipping models of the Keyspan USB PDA Adapter *USA-19Q, USA-19Qi) are compatible. If you have the USA-19 model, please contact Keyspan tech support for further details. USA19/Q, USA19W/QW, USA19H, USA49W/LC - If you are running Windows 98, Windows 98 SE, or Windows Me, you will have to add "AT&C0" to your modem initialization string. This is not necessary on Windows 2000 and Windows XP.

Modems (serial)

This User Manual applies to the Keyspan USB Serial Adapter Software for Windows. Rev 03jul13 Page 25
7.1.c - Configuration Examples for Windows The following is a list of available configuration examples for Windows. These example provide step-by-step instructions on configuring select serial devices. The current example available are:

Palm Desktop

For the latest version of this list, please visit our web site at: http://www.keyspan.com For the configuration examples for other operating system (ie Mac OS, Mac OS X, etc.), please refer to the user manual for that platform or visit our web site at: http://www.keyspan.com
This User Manual applies to the Keyspan USB Serial Adapter Software for Windows. Rev 03jul13 Page 26

7.1.c.01 - Palm Desktop

Before you begin.
This Configuration Example assumes that you have already done the following: 1. installed the Keyspan serial port hardware and software 2. installed the Palm Desktop software 3. connected the Palm Serial Cradle hardware to a Keyspan serial port If you have not performed any of the steps mentioned above, please do so before proceeding.
Step 1 - Check the Keyspan Serial Assistant
Before proceeding, you should check to see if the Keyspan serial port is installed correctly. To do this, open the Keyspan Serial Assistant (in Start menu -> Programs -> Keyspan USB Serial Adapter -> Keyspan Serial Assistant). When you open the Keyspan Serial Assistant, you will see a window similar to the one shown below:

Signal Designation Data Carrier Detect (Input) Received Data (Input) Transmitted Data (Output) Data Terminal Ready (Output) Ground Data Set Ready (Input) Request To Send (Output) Clear To Send (Input) Ring Indicator (Input)
In order to ensure compliance with emission specifications, cables should be shielded using braided shields and metal hoods with complete 100% contact between the shields and hoods.
External Loopback Connector Information
The Keyspan Serial Assistant allows you to perform two types of loopback tests - internal and external. The external test requires the use of a special loopback connector. This connector requires a "DB9 Female Loopback plug" with the following wiring:
Pin(s) 6 Wired to <-> <-> <-> Pin(s) 4,7,9
This User Manual applies to the Keyspan USB Serial Adapter Software for Windows. Rev 03jul13 Page 30

7.1.e - LED Behavior

The Keyspan USB Serial Adapter part number USA-19HS comes equipped with a green LED light that reports the status of the Keyspan adapter USB hardware and serial port. The following table shows all of the possible states of these LED light and what they mean:
Color Green State Off Significance The Keyspan adapter is not connected or not receiving power from your computer The Keyspan adapter software and hardware are working properly. The Keyspan serial port is available for use. The Keyspan serial port is 'in use' by an application on your computer and is ready to send and receive data to and from your serial device. The Keyspan serial port is sending and/or receiving data

On-Blinking Slowly

On-Steady Light

On-Blinking Rapidly

This User Manual applies to the Keyspan USB Serial Adapter Software for Windows. Rev 03jul13 Page 31

7.1.f - TX Ack Advance

USA-19H Tx Ack Advance Overview
Many Keyspan USB serial adapters support configurable "Transmit Acknowledgment Advance" (aka TX-ACK threshold, aka TX-ACK(nowledgement) advance, etc.) in the Keyspan Manager. This feature allows the user to adjust a device's transmit behavior to achieve the optimum compromise between compatibility (exact emulation of built-in ports) and improved throughput. This document describes the factors which a user should be aware of to guide their configuration of this feature.

The Problem

In the case of a standard, "built-in" serial port, the host CPU (the "brain" of the computer) can communicate directly with the serial hardware because the (serial) hardware is in the address space directly accessible to the CPU. When the serial port has transmitted all the data in its transmit FIFO (the buffer that holds characters waiting to be sent), it interrupts the CPU, which then adds more characters to the transmit FIFO with a minimal time delay. By contrast, in a USB to serial adapter, information about the state of the serial port FIFO reaches the CPU by means of USB messages. The USB subsystem in most computers delays the delivery of inbound (USB peripheral to USB host computer) USB messages by about 1 millisecond. The impact of this delay on serial throughput depends on the baud rate. At 9600 baud, it takes about 1 millisecond to transmit a character. If the serial adapter signals the host when it begins transmitting the last character in its FIFO, the host learns about it at about the same time the character is actually finished being transmitted. Since outbound (USB host computer to USB peripheral) USB messages are not subject to such a long delay, the host can supply new data before the serial port has been idle for too long. At higher baud rates, however, this 1-millisecond delay becomes more of a problem. For example, at 920 Kbps, 1 millisecond is enough time to send 92 characters. So, if you're sending 92 characters at a time, you will only achieve 50% throughput, since half the time is spent with the adapter waiting for the host to send more data.

The Work Around

Since there's no way to eliminate the USB delays, there's only one work around: the serial adapter has to lie about when it's done transmitting. This way, the adapter still has some data to transmit while it's waiting for more to arrive from the host. If the next data from the host arrives before the previous data is completely sent, the new data can be sent with no delay, and the device will achieve improved transmit throughput.
This User Manual applies to the Keyspan USB Serial Adapter Software for Windows. Rev 03jul13 Page 32
Notes about the Work Around
In most situations, the serial adapter's lie is harmless or beneficial, even. However, in some circumstances, this lie gets us into trouble. There are several ways this can happen: Flow control: If the adapter is programmed to use flow control, the remote (receiving) end of the serial connection can ask the adapter to suspend its data transmission (e.g. if it's not ready to receive more data). Since this state can persist indefinitely, the "I'm done" indication, if it were sent early, could arrive at the host a significant amount ahead of time. As a result, the application might use the "I'm done" signal as an indication that the remote end is ready, leading to various kinds of trouble. Data flushing: Sometimes, an application will issue a "transmit flush" command to the adapter get rid of extra data. For example, let's say that an application sends "AAAA" to the adapter, and then, once it's received the "I'm done" indication, sends "BBBB." Now, let's say that some time after sending "BBBB," the application decides to cancel whatever part of the "BBBB" has yet to leave the serial port, and sends a "transmit flush" command to the adapter. If the adapter had been lying about being done sending "AAAA," it might still not be done, and the flush could purge the transmit FIFO of some of the A's (which is not what the application was expecting) in addition to the B's. Timing: In some applications, the receipt of the "I'm done" indication is used as a timing reference point. For example, an application could send a data stream like this:

COMMAND...

The extra periods following COMMAND would be just used to establish a timing interval: the application would know that once the serial port said "I'm done," the receiver would have had at least 64 character times to process COMMAND. If the "I'm done" indication was sent early, the application might then do its subsequent action too early. There are many other communication protocols in which time periods are counted from the point that a message has been delivered. Any time you change the timing of the "I'm done" indication, you run the risk of interfering with such protocols.

What Should I Use?

There are two ways you can configure Tx Ack Advance: Standard: If you're using a baud rate of 57600 or less, you probably don't have a problem. The 1 millisecond delay will not significantly affect your throughput, and you can select this option. This option is also a good choice if you are running an application in which throughput is not an issue, or one in which guaranteeing 100% correct operation is important enough that you'd prefer not to risk having problems. Faster: If you're using a baud rate above 57600, you can simply try increasing this setting, and see whether it improves performance (in which case, great!), causes problems (in which case, don't use it), or doesn't make any difference (in which case it doesn't matter what you do).
This User Manual applies to the Keyspan USB Serial Adapter Software for Windows. Rev 03jul13 Page 33

7.1.x - Notices

Notices
United States FCC DECLARATION OF CONFORMITY We, InnoSys Incorporated at 3095 Richmond Parkway, Suite 207 Richmond, CA 94806 USA (510) 222-7717 declare under our sole responsibility that the KEYSPAN USB Serial Adapter, Model USA19H complies with Part 15 of FCC Rules. Operation is subject to the following two conditions: (1) this device may not cause harmful interference, and (2) this device must accept any interference received, including interference that may cause undesired operation. CAUTION: Changes or modifications to the USB Serial Adapter not expressly approved by InnoSys Incorporated could void the user's authority to operate this equipment. NOTE: This equipment has been tested and found to comply with the limits for a Class B digital device, pursuant to Part 15 of the FCC Rules. These limits are designed to provide reasonable protection against harmful interference in a residential installation. This equipment generates, uses and can radiate radio frequency energy, and, if not installed and used in accordance with the instructions, may cause harmful interference to radio communications. However, there is no guarantee that interference will not occur in a particular installation. If this equipment does cause harmful interference to radio or television reception, which can be determined by turning the equipment off and on, the user is encouraged to try to correct the interference by one or more of the following measures: Reorient or relocate the receiving antenna. Increase the separation between the equipment and receiver. Connect the equipment into an outlet on a circuit different from that to which the receiver is connected. Consult InnoSys Incorporated or an experienced radio/TV technician for help.

This User Manual applies to the Keyspan USB Serial Adapter Software for Windows. Rev 03jul13 Page 36
7.1.y - Keyspan Warranty Information
KEYSPAN Software License Agreement and Limited Warranty Definitions
The following definitions apply to the terms as they appear in this agreement. KEYSPAN means KEYSPAN, a division of InnoSys Incorporated. Software means the computer program contained in this package, and all updates to the computer program. The term also includes all copies of any part of the computer program. Documentation means the on-disk user's manual(s) as well as printed materials accompanying the Software. Product means the Software and Documentation

Copyright Protection

The Product is owned by KEYSPAN and is protected by United States and international copyright laws and international trade provisions. You must treat the Product like any other copyrighted material. This license and your right to use the Product terminate automatically if you violate any part of this agreement. In the event of termination, you must immediately destroy all copies of the Product or return them to KEYSPAN.

License Grant

Upon receipt of full payment for this product, KEYSPAN grants you a non exclusive license to: Use one copy of the Software on a single computer ("Dedicated Computer") Make one copy of the Software for archival purposes, or copy the Software onto the hard disk of your computer and retain the original for archival purposes. If one individual uses the Software on the Dedicated Computer more than 80% of the time it is in use, then the individual may also use a second copy of the Software for use on a single home computer, provided such use on a single home computer is limited to no more than 20% of the time. After written notification to KEYSPAN, transfer the entire product on a permanent basis to another person or entity, provided you retain no copies of the Product and the transferee agrees to the terms of this agreement. For the purposes of this section,"use" means loading the Software into RAM, as well as installation on a hard disk or other storage device (other than a network server). You may access the Software from a hard disk, over a network, or any other means you choose, so long as you otherwise comply with this agreement. You may NOT: Copy the documentation, except for purposes of creating a back-up copy for your own use.
This User Manual applies to the Keyspan USB Serial Adapter Software for Windows. Rev 03jul13 Page 37
Keyspan:USB Serial Adapter for Windows-v3.4 Manual Modify, translate, or merge the Software with another program, except for your personal use on a single computer. Any modifications to the Software are subject to this agreement. Reverse engineer, disassemble, decompile, or make any attempt to discover the source code of the Software. Sublicense, rent, or lease any portion of the Product. Use the previous version of the Software that has been upgraded or updated under this agreement. Upon upgrading, or updating the Software, the old copy must be deleted from the computer and the original disks destroyed.

This User Manual applies to the Keyspan USB Serial Adapter Software for Windows. Rev 03jul13 Page 39
7.1.z - Support Information

Contacting Support

If you require assistance with any Keyspan product, you may contact us by one of the following ways: web/email: fax: telephone : (tech support) http://www.keyspan.com/support/
(Monday through Friday: 9 am to 5 pm Pacific)

+1.510.222.0323

+1.510.222.8802
International Support Options
If you live outside of the United States and require assistance with your Keyspan product, please contact the Keyspan's distributor in your country for technical support in your language. For a list of Keyspan's international distributors, please visit our international web page at:
http://www.keyspan.com/international/
This User Manual applies to the Keyspan USB Serial Adapter Software for Windows. Rev 03jul13 Page 40

doc1

Tripp Lite 1111 West 35th Street Chicago, IL 60609 USA Telephone: +(773) E-mail: saleshelp@tripplite.com

Model #: USA-19HS

Keyspan High-Speed USB to Serial Adapter Highlights
Works with Windows and Mac OS Connects RS-232/DB9 (male) to USB Type A (male) Detachable 3-ft. cable included No external power source required

Description

Looking for a way to connect a serial device to the USB port on your PC or Mac? Our USB High Speed Serial Adapter provides a simple and reliable solution. This adapter is broadly recommended by serial device manufacturers due to its dependability and "Best in Class" compatibility. System Requirements Windows: An available USB port Compatible with Windows 98, 98 SE, Me, 2000, XP 32- and 64-bit, 2003 Server 32- and 64-bit, Vista 32- and 64-bit, and 7 32- and 64-bit
Macintosh: An available USB port Compatible with Mac OS 8.6 through 9.x, Mac OS X 10.2.8 through 10.5.x (both 32- and 64-bit), and Mac OS X 10.6 (32-bit and 64-bit)
For use with all RS-232 serial devices including modems, GPS devices, cell phones, hand held scanners, networking equipment (console port), graphics tablets, point of sale devices, touch screens, UPS devices, medical and scientific instruments, industrial process control devices, building automation instrumentation and other serial devices. Package Includes USA-19HS USB High-Speed Serial Adapter 3 ft. USB device cable CD with driver software and user guide

Features

Certified: Microsoft WHQL approved High Speed: Supports 230 Kbps - twice the speed of a built in serial port Detachable Cable: Use adapter with any USB cable (up to 5 meters long) LED: Shows adapter status and data activity Plug & Play: Appears as standard COM port
Mobile: Easy to carry - weighs just 2 oz. Bus Powered: No external power adapter required Analytic Tools: Includes Windows line monitor and data trace software Field Upgrade: Easy to update over time with free software downloads Easy Expansion: Supports use of multiple adapters on one PC

Specifications

PRODUCT OVERVIEW Product Overview PHYSICAL Color CONNECTIONS Connector A DB9 (MALE) Connector B USB A (MALE) WARRANTY Product Warranty Period (U.S., Canada & Puerto Rico) 2-year limited warranty Black Keyspan-by-Tripp Lite USB High-Speed Serial Adapter

Related Items

Optional Products Product Type USB Cables & Adapters USB Cables & Adapters USB Cables & Adapters USB Cables & Adapters USB Cables & Adapters Computer Cables Related Model U024-006 U024-010 U026-016 U209-000-R USA-49WG P520-006 Description 6-ft. USB A/A Gold Extension Cable for USB2.0 Cable (USB-A M/F) 10-ft. USB A/A Gold Extension Cable for USB2.0 Cable (USB-A M/F) 16-ft. USB2.0 A/A Active Extension Cable (USB-A M/F) USB to Serial Adapter (USB-A Male to DB9M) 4-Port USB Serial Adapter Keyspan by Tripp Lite 6-ft. RS-232 Serial Extension Cable (DB9 M/F) Qty. -
More information, including related products, owner's manuals, and additional technical specifications, can be found online at www.tripplite.com/en/products/model.cfm?txtModelID=3914.
Copyright 2011 Tripp Lite. All rights reserved. All trademarks are the sole property of their respective owners. Tripp Lite has a policy of continuous improvement. Specifications are subject to change without notice. Photos may differ slightly from final products.

 

Technical specifications

Full description

Looking for a way to connect your serial devices to a USB port on your PC? The Keyspan "High Speed" USB Serial Adapter is a simple, inexpensive, and reliable way to make this connection. The Adapter is ideal for use with modems, digital cameras, ISDN terminal adapters, graphics tablets, PDAs, bar code scanners, label printers and other serial devices, which require an RS-232 connection. This "High Speed" USB Serial Adapter supports data rates up to 230 Kbps - twice the speed of a standard PC serial port. It is 100% USB compliant and features simple "Plug and Play" installation (no IRQs). Ideal for laptops (it weighs just 2 oz.), the Adapter draws its power from the USB connection so no power adapter is required. This product is designed for the following systems: NEC MobilePro P300; Toshiba e740; Serial PDAs from Palm, Blackberry, Compaq, HP, Casio, Psion, and others; Digital Cameras; Modems; Wacom Intuos and ArtZ II Tablets; GPS devices; ISDN terminal adapters; Mobile phones with serial connection; Hand held scanners; RS-232 instrumentation used in POS, data acquisition and process control applications.

General
Device TypeSerial adapter
Form FactorExternal
Interface (Bus) TypeUSB
LocalizationUnited States
Networking
Connectivity TechnologyWired
Cabling TypeSerial
Data Link ProtocolRS-232
Data Transfer Rate230 Kbps
Expansion / Connectivity
Interfaces1 x serial - RS-232 - 9 pin D-Sub (DB-9)
Connections1 x USB - 4 pin USB Type A
Miscellaneous
Works with Windows VistaSoftware and devices that carry the Works with Windows Vista logo have been tested for baseline compatibility with PC's running.
Software / System Requirements
OS RequiredLinux, Microsoft Windows CE 3.0, Apple MacOS 8.6 or later, Microsoft Pocket PC, Apple MacOS X 10.1.3 or later, Microsoft Windows 98/ME/2000/XP
Peripheral / Interface DevicesUSB port
Universal Product Identifiers
BrandTripp Lite
Part NumberUSA-19HS
GTIN00858399242460, 00672603000413, 00840356476018

 

Tags

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