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APPENDIX: Cable and Connector Guidelines
A.3 The Expansion Port
The DB15 connector on the back of the ServSwitch Duo is a proprietarily pinned
port using RS-232-type signaling. Its main purpose is to be the attachment point for
the Switch’s optional Remote Control Module (RCM), but you can also connect an
RS-232 device to it to perform channel switching. See Section 5.12 for more details.
The pinout of this connector is pretty simple: Pin 9 (Signal Ground, SGND)
and Pin 11 (Receive Data, RD) are the only pins used for serial communication
to other RS-232 devices. All other pins are intended for RCM communication only
and should be left unconnected; attaching them to any other RS-232 equipment
could have unpredictable and possibly damaging effects.
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