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Programmer's Guide
Programmer's Guide, cont'd
The switcher's rear panel RS-232/RS-422 connector (figure 41) can be connected to
the serial port output of a host device such as a computer or control system. This
connection makes software control of the switcher possible.
Figure 41 — RS-232/RS-422 connector pin arrangement
The RS-232/RS-422 connector on the CrossPoint Plus Series switcher is a 9-pin D
female connector with the following pin assignments:
P
The protocol is 9600 baud, 8-bit, 1 stop bit, no parity, and no flow control.
Host-to-Switcher Instructions
The switcher accepts SIS (Simple Instruction Set) commands through the
RS-232/RS-422 port. SIS commands consist of one or more characters per
command field. They do not require any special characters to begin or end the
command character sequence. Each switcher response to an SIS command ends
with a carriage return and a line feed (CR/LF =
response character string. A string is one or more characters.
Switcher-Initiated Messages
When a local event such as a front panel operation occurs, the switcher responds
by sending a message to the host. The switcher-initiated messages are listed below
(underlined).
(C) Copyright 2001, Extron Electronics "CrossPoint/Mav/Matrix", Vx.xx
The copyright message is initiated by the switcher when it is first powered on.
Vx.xx is the firmware version number.
RECONFIG
The reconfig message is initiated by the switcher when a front panel operation has
occurred, an audio gain adjustment has been completed, or a memory preset has
been recalled.
4-2
CrossPoint Plus Matrix Switchers • Programmer's Guide
5
9
Female
The CrossPoint Plus Series Matrix Switchers are factory configured for
RS-232 control. To use the switcher under RS-422 control, an internal cable
must be moved. Refer to appendix B for the procedure for moving the cable.
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