KEYSPAN® Series

USA-28XG

USB Twin Serial Adapter for Macs Keyspan by Tripp Lite

• Provides two RS-422 MiniDin8 serial ports via the USB port on your Mac
• Supports data rates up to 1 Mbps
• Qualified for use with Final Cut Pro

Overview

There is good reason why we sell more Mac USB serial adapters than any other company. We've been making PCI serial cards and USB serial adapters for Mac OS for more than 10 years!

Our USB Twin Serial Adapter is recommended by dozens of serial device manufacturers and has been certified by Apple for use with Final Cut Pro.

Apple LaserWriter 4/600 or Laserwriter 4/600 PS Compatibility

The Apple Laserwriter 4/600 is an Apple Laser printer. This printer shipped with Localtalk, Ethernet, and Parallel Ports. Keyspan does not have any products that would connect this printer to Mac that does not have a built in serial ports. Although Keyspan does sell a USB to Serial adapter, serial ports are not the same thing as a LocalTalk port. Because of this technical difference, Keyspan USB to Serial adapters will not work with this printer. Keyspan does sell a USB to Parallel product (http://www.keyspan.com/products/usb/up6c/) that may work with this printer under Mac OS X however this requires you to obtain a driver (from Apple or a 3rd party) that would compatible with: a) your Laserwriter 4/600, b) Mac OS X, and most importantly, c) a USB to Parallel cable. This configuration is not supported. This printer can be connected via Ethernet by using a 'Ethernet Transceiver' (AAUI to RJ-45). Once you connect the Laserwriter 16/600 via Ethernet, you can print from both Mac OS X and Mac OS 9 computers. For more information, read your printer's manual for more information.

Apple Laserwriter Select 360 Compatibility

The Apple LaserWriter Select 360 is an Apple Laser printer. This printer shipped with Localtalk and Parallel Ports. Apple currently only has AppleTalk drivers for this print on Mac OS 8-9.x and certain versions of Mac OS X. Keyspan does not have any products that would connect this printer to Mac that does not have a builtin serial ports. Although Keyspan does sell a USB to Serial adapter, serial ports are not the same thing as a LocalTalk port. Because of this technical difference, Keyspan USB to Serial adapters will not work with this printer. Keyspan does sell a USB to Parallel product (http://www.keyspan.com/products/usb/up6c/) that may work with this printer under Mac OS X however this requires you to obtain a driver (from Apple or a 3rd party such as GimpPrint) that would compatible with: a) your Laserwriter 360, b) Mac OS X, and most importantly, c) a USB to Parallel cable. This configuration is not supported is not supported by Apple or Keyspan. This printer might be able to be connected via Ethernet by using a 'Ethernet Transceiver' (AAUI to RJ-45). Once you connect the Laserwriter 360 via Ethernet, you can print from both Mac OS X and Mac OS 9 computers. For more information, read your printer's manual to see if your printer supports Ethernet (via a AAUI cable).

Difference Between USA-28, USA-28X (A/B), USA-28X

As of December 2006, the USA-28XG is the current shipping Keyspan USB Two Port Din8 Adapter for Mac. The USA-28XG is a 'green' RoHS compliant version of the USA-28X. The USA-28XG is identical in features as the USA-28X. Over the years, there have been various models of the 'USA-28' family. The following is a list of these adapters of these adapters (with newer adapters at the top of the list): USA-28XG USA-28X (includes USA-28X, USA-28 A, and USA-28X B) USA-28 The USA-28X models (USA-28X, USA-28X A, USA-28B) were all identical to each other. The USA-28XG and USA-28X (any version) are identical to each other The USA-28 was Keyspan's first adapter. It lacked the 'external clock' support of the USA-28X/28XG models. This feature only affected serial devices that required external clock signals (ie certain Apple StyleWriters). If you have any questions or comments about this FAQ, please contact Keyspan technical support.

Do the Keyspan serial port products support Mac OS 10.6 (Snow Leopard)?

The latest driver version 2.6b (file: Model USA-19HS, USA-49WG, USA-28XG & UPR-112G Keyspan Driver - Mac OS 10.6 (Snow Leopard) - found in Help & Downloads section of each product as well as the download section) will allow the following products to run on Mac OS10.6. Those products are the USA-19HS, USA-49WG, USA-28XG, and the serial port of the UPR-112G. Although previous versions of these serial based products should work with the new driver release, our support staff will only be able to troubleshoot issues with the current skus. We have done extensive testing, but welcome you the user to give any additional feedback to help with the improvement of the this beta driver.

Do you have Windows drivers for your Din-8 serial port products?

Keyspan does not provide Windows drivers for our Din-8 serial port products (ie USA-28X, USA-28, USA-18X, SXPro4, SX2, SX4) as Windows never utilized the Din-8 serial port (Windows uses DB9 serial ports). Keyspan Din-8 serial products are made for Mac only. On top of this, Windows programs expect to speak to either DB9/DB25 serial ports which are intrinsically different from Din-8 ports. Because of this, even if you had a Windows driver for a Keyspan Din-8 product, you (as the user of this product) would need to manufacture a specific Din-8 to DB9/DB25 for your specific device (unfortunately, a universal Din-8 to DB9/DB25 is not possible due to technical issues). KEYSPAN DOES NOT PLAN ON RELEASING A WINDOWS DRIVER FOR ANY KEYSPAN DIN-8 PRODUCT DUE TO THESE ISSUES. If you need to add a serial port to a Windows computer, please note that Keyspan does provide DB9 serial ports for Windows (and Mac) in the following products: * USA-19HS (http://www.keyspan.com/products/usb/usa19hs/) and *USA-49W (http://www.keyspan.com/products/usb/usa49w/ ADDITIONAL INFO: Keyspan has never developed a Windows driver for Keyspan Din-8 products. Unfortunately, there are no beta/alpha/prerelease Windows drivers for Keyspan Din-8 products.

Does Keyspan have a product that will allow me to connect my Laserjet 5M to my Mac? For Mac OS 9 Users: - - - - - - - - - - Keyspan USB to serial adapters allow you connect many serial printers to Mac OS 9 however Laserjet printers DO NOT HAVE SERIAL

For Mac OS 9 Users: - - - - - - - - - - Keyspan USB to serial adapters allow you connect many serial printers to Mac OS 9 however Laserjet printers DO NOT HAVE SERIAL PORTS. Laserjet Printers have LocalTalk ports. Any software or printer that uses AppleTalk or LocalTalk is not compatible with any USB to Serial Adapter. There are other solutions to hooking up AppleTalk printers via Ethernet. Unfortunately, Keyspan does not make these products. For Mac OS X Users: - - - - - - - - - - On Mac OS X, HP has only released Ethernet compatible drivers for their Laserjet printers. If you want to use the HP driver, you must use an HP JetDirect product. You may be able to use our USB to Parallel cable with a 3rd party driver called GimpPrint. GimpPrint is not supported by HP or Keyspan.

Does the Keyspan SXPro or USA28X support MIDI (Opcode/OMS/FreeMIDI/MOTU) on Mac OS X?

Keyspan supports MIDI on Mac OS 8.6-9.x however MIDI is not supported in Mac OS X. We currently do not have any plans to support MIDI on Mac OS X anytime in the near future.

How do I HotSync my Palm in Mac OS X?

Please see this FAQ: Title: Troubleshooting: Palm on Mac OS X Using Keyspan Serial Ports URL: http://keyspan.custhelp.com/cgi-bin/keyspan.cfg/php/enduser/std_adp.php?p_faqid=371

How do I uninstall the Keyspan Mac OS X software for my Keyspan serial port device?

To uninstall the Keyspan Mac OS X software for Keyspan serial port adapters and cards, please do the following: 1. Open the KEYSPAN SERIAL ASSISTANT application. This application is located in your APPLICATIONS folder. 2. In the KEYSPAN SERIAL ASSISTANT, locate the SETTINGS menu. The SETTINGS menu is located in the menu bar at the top of your screen. Note: If you can't locate the SETTINGS menu, quit and reopen the KEYSPAN SERIAL ASSISTANT. Next find the blue Apple icon in the upper lefthand corner of your screen. Immediately to the right of the blue Apple icon, you will see 'Keyspan Serial Assistant', 'File', and 'Window' menus. The SETTINGS menu is to the right of the 'Window' menu. 3. If you have a Keyspan USB to Serial Adapter (any model), select 'Un-install USB Serial Extension'. If you have a Keyspan SXPro Serial Card, select 'Un-install SXPro Extension'. Note: You may need to enter your user name and password to remove the Keyspan extension. This can either be the same user name and password that you used to install the software or you can use any user name and password that has administrative privilege. 4. Once you have remove the Keyspan extension for your Keyspan product, quit the KEYSPAN SERIAL ASSISTANT application and drag it to the TRASH. Empty the trash to complete the uninstall process. 5. Uninstall complete.

HP LaserJet 4L Mac Compatibility

For Mac OS 9 Users: - - - - - - - - - - Keyspan USB to serial adapters allow you connect many serial printers to Mac OS 9 however Laserjet printers DO NOT HAVE SERIAL PORTS. Laserjet Printers have LocalTalk ports. Any software or printer that uses AppleTalk or LocalTalk is not compatible with any USB to Serial Adapter. There are other solutions to hooking up AppleTalk printers via Ethernet. Unfortunately, Keyspan does not make these products. For Mac OS X Users: - - - - - - - - - - On Mac OS X, HP has only released Ethernet compatible drivers for their LaserJet printers. If you want to use the HP driver, you must use an HP JetDirect product. NOTES ON LASERJET 6L HARWDARE: There are some versions of this printer that only have a parallel port.

Is the LaserWriter 320 compatible with my Keyspan Serial Port?

IMPORTANT: The LaserWriter 320 is NOT THE SAME AS A LaserWriter 310 or LaserWriter 300. This information ONLY APPLIES to the LaserWriter 320. The Apple LaserWriter 320 is an Apple Laser printer. This printer shipped with one Din8 port. This printer only shipped with the LaserWriter8 driver which means that this printer only has LocalTalk/AppleTalk protocol support (and no SERIAL support). Although Keyspan does sell a USB to Serial adapter and PCI serial cards, serial ports are not the same thing as a LocalTalk port. Because of this technical difference, Keyspan Serial products will not work with this printer. The only way to connect the Apple LocalTalk based Laserwriter to a non-LocalTalk computer (ie computer that does not have the old style MODEM and PRINTER ports), is to use a LocalTalk to Ethernet converter cable/box. Keyspan does not make LocalTalk to Ethernet converters and therefore we cannot not offer support and/or further information on these types of products. RELEVANT LINKS/FAQs: - - - - - - - - - - - - - - http://docs.info.apple.com/article.html?artnum=112497 http://keyspan.custhelp.com/cgi-bin/keyspan.cfg/php/enduser/std_adp.php?p_faqid=122

Keyspan Din8 Pinout

The pin assignments for the Keyspan Female Din8 ports are illustrated below:

Pin	Name	Signal Designation
1	HSKo	Handshake Output (DTR)
2	HSKi	Handshake Input (CTS)
3	TxD-	Transmit Data (-)
4	GND	Ground
5	RxD-	Receive Data (-)
6	TxD+	Transmit Data (+)
7	GPi	General Purpose Input (DCD)
8	RxD+	Receive Data (+)

NEEDS REFORMATTING

Laserjet 4100 Compatibility

For Mac OS 9 Users: - - - - - - - - - - Keyspan USB to serial adapters allow you connect many serial printers to Mac OS 9 however Laserjet printers DO NOT HAVE SERIAL PORTS. Laserjet Printers have LocalTalk ports. Any software or printer that uses AppleTalk or LocalTalk is not compatible with any USB to Serial Adapter. There are other solutions to hooking up AppleTalk printers via Ethernet. Unfortunately, Keyspan does not make these products. For Mac OS X Users: - - - - - - - - - - On Mac OS X, HP has only released Ethernet compatible drivers for their Laserjet printers. If you want to use the HP driver, you must use an HP JetDirect product. You may be able to use our USB to Parallel cable with a 3rd party driver called GimpPrint. GimpPrint is not supported by HP or Keyspan.

Laserwriter 320 Compatibility

IMPORTANT: The LaserWriter 320 is NOT THE SAME AS a LaserWriter 310 or LaserWriter 300. This information ONLY APPLIES to the LaserWriter 320. The Apple LaserWriter 320 is an Apple Laser printer. This printer shipped with one Din8 port. This printer only shipped with the LaserWriter8 driver which means that this printer only has LocalTalk/AppleTalk protocol support (and no SERIAL support). Although Keyspan does sell a USB to Serial adapter and PCI serial cards, serial ports are not the same thing as a LocalTalk port. Because of this technical difference, Keyspan Serial products will not work with this printer. The only way to connect the Apple LocalTalk based Laserwriter to a non-LocalTalk computer (ie computer that does not have the old style MODEM and PRINTER ports), is to use a LocalTalk to Ethernet converter cable/box. Keyspan does not make LocalTalk to Ethernet converters and therefore we cannot not offer support and/or further information on these types of products.

LaserWriter NTR Compatibility

IMPORTANT: The Apple LaserWriter NTR is an Apple Laser printer. This printer shipped with one Din8 port (LocalTalk), one Centronics Parallel port, and one DB9 serial port. Although Keyspan does sell a USB to Serial adapter and PCI serial cards, serial ports are not the same thing as a LocalTalk port. Because of this technical difference, Keyspan Serial products will not work with this printer. The DB9 serial and the Centronics parallel port are not supported by Apple in Mac OS X. The only way to connect the Apple LocalTalk based Laserwriter to a non-LocalTalk computer (ie computer that does not have the old style MODEM and PRINTER ports), is to use a LocalTalk to Ethernet converter cable/box. Keyspan does not make LocalTalk to Ethernet converters and therefore we cannot not offer support and/or further information on these types of products.

Mac OS X 10.5 (Leopard) Compatibility

Note: This FAQ will be updating frequently during the 60 days after Mac OS X 10.5's release. Keyspan has tested our products under prerelease versions of 10.5. The following information is based on this testing and should apply to the public release of 10.5. We will be testing the public version of 10.5 after it has been released on Oct 26, 2007. Our results will be updated here. Please note that many of our products are used by other applications (ie Palm software uses our serial ports to communicate with Palm handhelds, Skype software and our VoIP phone, GPS software with GPS hardware connected via a Keyspan adapter). Please make sure that your 3rd party software (ie Palm software, GPS software, etc) is 10.5 compatible. USB to Serial Adapters (any USA-xxx model adapter, any UPR-xxx port replicator) Software version 2.4 or later - COMPATIBLE USB/Print Server (US4A, PS4A, U2S2A) COMPATIBLE Update to software version 2.1b4. An uninstaller is also available (v2.1b3). This version has been posted on our downloads page. Software version 2.0.1 or earlier - NOT COMPATIBLE. We will be releasing an update shortly to address 10.5 issues. Do not install v2.0.1 or earlier on 10.5. IR Based Remotes (any UIA-xxx receiver and REM-xxx remote) Software version 2.4b4 or later - COMPATIBLE. Please note that Express Remotes connected to Airport Express units don't require software. This is expected to work in 10.5 as well. RF Based Remotes (PRUS2, PREZ1, ERRF1, PRPRO3) COMPATIBLE - no drivers needed. For remotes that require software to enable F5, please note that we will be releasing an update for 10.5. TuneView USB COMPATIBLE TuneView for iPod COMPATIBLE - software is only needed for firmware updates. This software is 10.5 compatible. USB Hubs / USB PCI and CardBus Cards / Firewire PCI and CardBus Cards COMPATIBLE - no drivers needed. VoIP Phone Our 1.1.6 software seems to work on 10.5 with Skype v 2.6.0.184 however Skype recommends that you use Skype v 2.7.0.195 BETA for 10.5. We're still testing this version. We won't be ready to say we have 10.5 compatibility until 10.5 support is released in non-beta form from Skype. Bluetooth Adapter COMPATIBLE - no drivers needed. UP-6C/UP-6CM UNTESTED. We will be testing this product shortly. SX Pro Serial Card UNTESTED. If you have any problems with the SXPro Card with 10.5, please contact techsupport@tripplite.com

RS485 and Keyspan

It is possible to use our RS422 adapters 28x and 28xg with RS485 in OSX if you have software control of the signals. RS232 anbd RS485 are not compatible.

Setup: MacENC GPSNavX Keyspan Serial Port Configuration

To Configure MacENC to use Keyspan Serial Port, please follow these steps: - - - - - Step 1: - - - - - If MacENC is currently open, quit MacENC. Install the Keyspan software for your adapter and then connect your Keyspan adapter to your Mac's serial port. - - - - - Step 2: - - - - - Open the Keyspan Serial Assistant application (located in your APPLICATIONS folder). The 'Assistant' will show your Keyspan adapter and the serial ports created by the adapter. If your adapter and its ports (you may have more than one even when using a single port adapter) appear in the 'Assistant', proceed to the next step. If the adapter does not appear, contact Keyspan tech support letting know that your adapter does not appear in the Keyspan Serial Assistant. - - - - - Step 3: - - - - - Launch/open MacENC. In the menu bar, select the GPS menu and then select the CONNECT command. This will open a new window called GPS. In the new window, click the SETTINGS button. This will show settings for GPS. Locate the PORT field and select your Keyspan serial port from the port field. This will typically be KeySerial1. Set the other fields (TYPE, RATE (baud), etc) according to MacENC instructions. Once you have set your other settings, the MacENC will open a connection to the Keyspan adapter. If your adapter has a status light, the light will stop blinking slowly (indicating that the port is IDLE) and will turn on and stay solid (not blink) or blink rapidly (indicating that port has been opened by MacENC). Set Up Is Now Complete. - - - - - - - - Support Notes - - - - - - - - Keyspan has writing this configuration guide. This information is focused on configuring the program to use your Keyspan serial port(s). There may be additional steps needed to configure other aspects of the program that are not Keyspan related. Please contact the maker of your program for additional support. MacENC version 4.10 (4.10) was used for this guide. This information may also apply to previous and future versions of MacENC. - - - - - - - - - - - - Additional Links: - - - - - - - - - - - - http://www.gpsnavx.com/ http://www.macenc.com/

The Installer package 'xxx' cannot be opened. The Bill of Materials for this package was not found.

The message 'The Installer package 'xxx' cannot be opened. The Bill of Materials for this package was not found.' means that installer.app is having problems with the .pkg installer that you have downloaded. This means that that your .pkg file is corrupted. In general, there are two causes of this problem. The original pkg file was corrupted before you received it or the pkg file was corrupted as it was extracted/expanded after it was downloaded. Since Keyspan's downloads are tested before they are posted, the usual cause of this problem (here at Keyspan) is that your file expander (ie Stuffit or Stuffit Expander) is corrupting the file. To fix this issue, we recommend that you: 1. delete all of downloaded Keyspan files (pkg files and zip files) 2. re-download the Keyspan file(s). This time, don't use Stuffit/Stuffit Expander. Instead, find the Keyspan .zip file, select the file (aka highlight it), right click or control-click on the zip file (to open the contextual submenu), select OPEN WITH > BOMArchive Helper. This will open the file with Apple's utility and create a new .pkg file. 3. run/double-click the new pkg file. If you have any questions, please contact Keyspan support. FYI... Upgrading to the latest version of Stuffit and/or Stuffit Expander can sometimes fix this issue as well.

Troubleshooting: Palm on Mac OS X Using Keyspan Serial Ports

Step 1: Check The Keyspan Serial Assistant / Connect The Keyspan Adapter - - - - - If you have not installed the Keyspan software, please install it before proceeding. Once the Keyspan software is installed, connect the Keyspan adapter to your computer's USB port. Since we are troubleshooting, connect the Keyspan adapter directly into a USB port on your computer and not a USB port on a USB hub, keyboard, or monitor (you can connect the Keyspan adapter later to the desired port - connecting the adapter to a built in USB port eliminates problems introduced by USB ports on USB hub, keyboards, and mice). Now that the Keyspan adapter is connected to a built in USB port, open the KEYSPAN SERIAL ASSISTANT application. This application is found in your APPLICATIONS folder in Mac OS X. Once the KEYSPAN SERIAL ASSISTANT is open, you should be able to see your Keyspan adapter listed in the Keyspan Serial Assistant window. [Step 1: Option A: SUCCESS: Adapter Shows Up In Keyspan Serial Assistant Window] If your adapter shows up in the Keyspan Serial Assistant window, click the triangle on the LEFT of your adapter's name. This will show the name of the port that was created by your adapter (ie USAxxxyyy.p1). Please take note of this port name as we will need this in Step 3. Once you have noted the port name, close the Keyspan Serial Assistant and proceed to Step 2. [Step 1: Option A: FAILURE :Adapter DOES NOT SHOW UP In Keyspan Serial Assistant Window] If your adapter does not show up in the Keyspan Serial Assistant window, please inform Keyspan tech support of this and let us know which specific Keyspan product (name and part number) you are using. We will be able to assist you from this point on. Step 2: Open the Palm Desktop Software For Mac OS X - - - - - Open the Palm Desktop Software for Mac OS X. If you do not know how to do this or what this means, contact Palm tech support or read the Palm Mac OS X documentation. Once you have opened the Palm Desktop application proceed to Step 3. Step 3: Access The HotSync Manager And Select the Keyspan Port (from Step 1) - - - - - In the Palm Desktop Software, open the HotSync menu (located in the menu bar) and select SETUP. This will open a window with two tabs. Click the HOTSYNC CONTROL tab (the left tab). In the HOTSYNC CONTROL tab, set HOTSYNC to DISABLED (this needs to be done anytime you make a change to the HotSync options on your computer). Next, click the CONNECTION SETTINGS tab. In the CONNECTION SETTINGS tab, you should see a list of connection types with check boxes to the left the connection names. Once the connections/ports will be your Keyspan adapter. Turn ON the Keyspan connection and turn OFF all of the other (including USB). IMPORTANT!!! Match the port shown in the CONNECTION SETTINGS tab to the port name from Step 1. The names MUST match. Once you have verified this, click the HOTSYNC CONTROL tab. In the HOTSYNC CONTROL, set the HOTSYNC to ENABLED. You have now told the Palm software to use the Keyspan serial port. If you have an adapter with an embedded light, you should notice that the light is solid and not blinking slowly. Proceed to Step 4. Step 4: Try To HotSync - - - - - You should now try to HotSync. [Step 4: Option A: SUCCESS: HOTSYNC Works] If HotSync works, you are finished. If are are moving your adapter to a different USB port, please note that you will need to repeat steps 1-3. [Step 4: Option B: PARTIAL SUCCESS: HotSync Starts But I'm Asked To Create A User] If the HotSync start but you are asked to create a user account, this means that the serial connection has completed but the HotSync needs to create a 'user account' on your computer before proceeding. This is normal and part of the PALM HotSync process when you first HotSync your Palm device to a new computer. If you need help, contact Palm or read the Palm documentation on what to do next. [Step 4: Option C: PARTIAL SUCCESS: HotSync Starts But Gets Stuck On ESTABLISHING CONNECTION] If the HotSync starts but your computer screen and Palm device get stuck on ESTABLISHING CONNECTION, this means that the serial connect has completed but the Palm software is trying to match find a Palm 'User' file on your computer to HotSync with. Since it cannot find the correct file, it get stuck. This is usually caused by bad installation of the Palm software or by having multiple copies of the Palm Desktop Software (and therefore multiple Palm 'User' files) on your computer. For help with this matter, contact Palm tech support for help with cleaning up this issue. [Step 4: Option D: FAILURE: Nothing Happens] If nothing happens when you try to HotSync, repeat this process a second time. If it still fails, contact Keyspan tech support. [Step 4: Option E: FAILURE: Something else] If something else happens when you try to HotSync, please let Keyspan tech support what happens when you try to HotSync and we will direct you from there.

What baud rates are supported by Keyspan serial ports?

Although each Keyspan adapter is different, most Keyspan adapters support standard baud rates up to 230 Kbps. Since each adapter is different, please refer to your adapter's documentation and/or packaging about its maximum baud rate. Standard baud rates are set by your computer's OS (while maximum baud rate is usually set bu the serial port). Standard baud rates include: 110 300 600 1200 2400 4800 9600 14400 19200 28800 38400 57600 115200 230400

What is the KeySerial1 port in Mac OS X?

The KeySerial1 port is a feature that was added to latest version of the Keyspan Serial Adapter software for Mac OS X. The KeySerial1 port is an alias or shortcut to the: - the port 1 on a Keyspan adapter (if you have a multiple port Keyspan adapter) - of the first Keyspan adapter (any model) detected by your computer The purpose of the KeySerial1 port is to make it easier for customers and developers to easily identify and select a Keyspan port in Mac OS X based software. Keyspan still Keyspan still maintains its geographical port naming scheme. Because of this, you will get a dynamic port name and one extra port name called KeySerial1. Geographical port names will change depending on which USB port your Keyspan adapter is connected to. For example, if you have a port name called: USA19H4b13P1 This tells us that you have a USA-19HS unit that is connected to the USB location called '4b13'. If you move that adapter to another USB port, the USB location will change and you will get a different USB location and, by extension, a different port name (ie USA19H4b14P1). If your software is pointing to USA19H4b13P1 and you've moved the Keyspan adapter, the USA19H4b13P1 doesn't exist anymore and your software will not be able to find your serial device. HOWEVER, if you point your software to KeySerial1, you will be not have to worry about the port number changing since KeySerial1 will always point to a defined device (see the rules above).

What MIDI devices are compatible with my Keyspan device on Mac OS 8.x - 9.x?

Keyspan Din8 externally clocked serial ports (is ports on SXPro, USA28X, USA18X) support MIDI at the hardware level however you still need to have some of MIDI software (ie FreeMIDI or OMS) that can communicate with the Keyspan serial port. To determine if your MIDI setup will be compatible, please read the following: If your MIDI device is compatible with FreeMIDI (http://www.motu.com/), yes. Please visit MOTU's web page for additional requirements for FreeMIDI. If your MIDI device uses OMS (by Opcode), please note that the OMS software itself is not compatible with with ANY USB to SERIAL adapter. In some cases, you may be able to get OMS devices to work using FreeMIDI's OMS emulation mode. OMS will not work natively through Keyspan serial ports when using Opcode's software. If your MIDI devices does not use FreeMIDI or OMS (ie it uses Apple's MIDI system or some other software), your MIDI device will not be compatible. IMPORTANT NOTE: This applies to Mac OS 8.x to 9.x. Keyspan does not support MIDI on Mac OS X or Classic (Mac OS 9.2.2 running within Mac OS X)