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MVX 128 A VGA Matrix Switchers • Programmer’s Guide
4-2
Programmer’s Guide
PRELIMINARY
The switcher’s rear panel Remote 9-pin D female connector (fi gure 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.
RS-232FunctionPin Function
1
2
3
4
5
6
7
8
9
—
TX
RX
—
Gnd
—
—
—
—
Not used
Transmit data
Receive data
Not used
Signal ground
Not used
Not used
Not used
Not used
—
TX–
RX–
—
Gnd
—
RX+
TX+
—
Not used
Transmit data (–)
Receive data (–)
Not used
Signal ground
Not used
Receive data (+)
Transmit data (+)
Not used
RS-422
5
1
9
6
RS232/RS422
REMOTE
Figure 4-1 — Remote connector pin assignments
The default protocol is as follows:
• 9600 baud • no parity • 8-bit
• 1 stop bit • no fl ow control
N
The MVX 128 A switcher can support either RS-232 or RS-422 serial
communication protocol, and can operate at 9600, 19200, 38400, or 115200
baud rates. See Selecting the RS-232/RS-422 protocol and baud rate on
page 3-33, Operation, to confi gure the RS-232/RS-422 port from the front
panel.
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 fi eld. 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 2005, Extron Electronics CP 300 450 MAV IP, Vx.xx, 60-799-01
]
The switcher initiates the copyright message when it is fi rst powered on. Vx.xx is
the fi rmware version number.
Qik
]
The switcher initiates the Qik message when a front panel switching or preset recall
operation has occurred.
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 input audio level change
has occurred. “nn” is the input number and “xx” is the dB level.