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Chapter 3: Installation
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3.2.4 Channel switching by external control
The OPTIONS port allows external control of the current channel by commands sent either via RS-232 serial input or by switching
one of the four channel select input lines. For more details about the necessary RS-232 serial cable, see Appendix C.
3.2.4.1 OPTIONS port pinout
The OPTIONS port can accept either 8p8c or 10p10c connectors, as required. See Figure 3-13.
8p8c 10p10c Signal
1 Channel select input 1
1 2 5VDC power output (100mA max)
2 3 GND reference for all signals
3 4 RS232 (RXD) data receive
4 5 RS232 auxiliary data transmit (reserved)
5 6 RS232 auxiliary data receive (reserved)
6 7 RS232 (TXD) data transmit
7 8 Channel select input 2
8 9 Channel select input 3
10 Channel select input 4
Figure 3-13. Signal and power pin-outs on the OPTIONS port
To connect a computer or device for remote control
1 Insert the 8p8c or 10p10c connector of the cable to the
OPTIONS port on the rear panel of the unit. See Figure 3-14.
Figure 3-14. Link cable to the OPTIONS port on the rear panel.
2 Connect the other end of the cable to a vacant serial port on the computer or to the output of the switching device.
