APPENDIX C: AUDIO/SERIAL PORTS
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Appendix C: Audio/Serial Ports
Operation & Multi-Port Configuration
This appendix describes audio & serial interface operation for ACU4222A.
This extender allows bi-directional stereo audio and a full-duplex serial data to be sent across
the secondary CATx interconnection cable.
Serial Interface - Set Up and Operation
No setting up or user adjustments are required.
The Remote unit’s serial port is wired as DTE - the same as that on a PC. To connect a serial
printer or other DTE (rather than DCE device) to the Remote unit, you will need a Null-
Modem crossover cable between the Remote unit and the printer. Select Xon/Xoff software
flow control on the printer and PC.
A serial touch screen may be plugged directly into the Remote unit.
Serial Interface – Handling Multiple Serial Devices
The extender’s serial interface transmits/receives six signals (3 signals in each direction).
Normally, four of these signals are used for hardware handshaking (in addition to TX & RX).
However, because each handshaking line can support signals up to 19,200 Baud it is possible
to configure the serial interface to handle up to three simple 2-wire (Tx/Rx only) serial links.
To do this, you will need to construct a custom breakout cable. Please contact Technical
Support for further information.
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