APPENDIX B: AUDIO/SERIAL PORTS
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Appendix B: Audio/Serial Ports Operation and Multi-Port Configuration This appendix describes audio & serial interface operation for:
• ACU1006SRA and ACU1006DSRA
• ACU1006VRA and ACU1006DVRA
Please note that on dual access Local Hubs, the serial link remains active during a Private
Mode session but audio transmissions are stopped.
Serial Interface Setup and Operation
Serial only systems ACU1006SRA and ACU1006DSRA
Baud Rate
With serial-only systems, you can set the baud rate for a serial extension to 9600bps or
19200bps at the Remote Unit. Refer to the manual supplied with your Remote Unit for more
information.
You can override this setting and fix the baud rate at 1200bps using a jumper on the serial
daughterboard in the Local Hub. You may want to use this baud rate to extend a mouse
device such as an industrial trackball.
In most cases, we recommend that you use PS/2 mouse devices with your extender system. If
you have a PC that does not have a PS/2 mouse port:
• Plug a PS/2 mouse into the Remote Unit
• Use an Mdapt (PS/2) Serial Mouse Converter to connect the PC to your Local Unit.
The drivers supplied with certain Wacom Graphics Tablets dynamically
alter the baud rate and cannot be used with an Extender Local Hub. There
is a version of the driver available with a fixed baud rate. Please contact
Technical Support for more information.
To change the baud rate to 1200bps:
2. Remove the Local Hub’s top cover by unfastening the five retaining screws.
3. Lift of the top cover. There are six serial daughter boards for each port in the Local Hub.
Locate the Baud jumper posts on the appropriate serial daughter board (see Figure 10).
The circuit board has several jumper blocks in addition to
those shown in Figure 10. Do not adjust any of these
settings, as you will cause the extender system to
operate incorrectly.