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Programmer’s Guide, cont’d
TPX 88 Matrix Switchers • Programmer’s Guide4-2
Programmer’s Guide
The switcher’s rear panel 3.5 mm, 5-pole captive screw connector (figure 4-1) can
be connected to the RS-232 or RS-422 serial port output of a host device such as a
computer running the HyperTerminal utility, an RS-232 capable PDA, or a control
system. This connection makes software control of the switcher possible.
GND
TX-
TX +
RX -
RX +
RS-232 FunctionPin
Gnd
—
TX+
—
RX+
Gnd
TX-
TX+
RX-
RX+
Signal ground
Not used
Transmit data
Not used
Receive data
Gnd
TX-
TX+
RX-
RX+
Signal ground
Transmit data (-)
Transmit data (+)
Receive data (-)
Receive data (+)
RS-422 Function
RS-232
RS-422
RS-232
RS-232
Settings
RS-422
Settings
RS-422
Figure 4-1 — Remote connector pin arrangement
The TPX switcher can communicate using either the RS-232 or RS-422 serial
communication protocol. The protocol is DIP-switch selectable. See chapter 2,
Installation, to configure the DIP switches.
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 = ), which signals the end of the
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 2003, Extron Electronics, TPX 88, Vx.xx
The switcher initiates the copyright message when it is first powered on. Vx.xx is
the firmware version number.
Qik
The switcher initiates the Qik message when a front panel switching operation has
occurred.
Rprnn
The switcher initiates the Rpr message when a memory preset has been recalled
from the front panel. “nn” is the preset number.
Sprnn
The switcher initiates the Spr message when a memory preset has been saved from
the front panel. “nn” is the preset number.
Innn Audxx
The switcher initiates the Aud message when a front panel audio level operation
has occurred. “nn” is the input number and “xx” is the dB level.