Extron Electronics MVP 104GX User Guide - Manual (Page 40)

Programmer’s Guide
MVP 104GX Programmer’s Guide 5-2
Remote Control Port (RS-232/RS-422)
The MVP 104GX RS-232/RS-422 port connector is used to connect to a host
or external controlling device, such as a computer or control system which
can generate the proper command codes and recognize the MVP 104GX
responses.
The MVP 104GX comes from the factory configured for RS-232. To set the
MVP 104GX for RS-422 operation, see “Configuring the MVP 104GX for
RS-422” in the appendix.
The RS-232/RS-422 connector is a 9-pin D female (see illustration above)
with the following pin designations:
Pin RS-232 Description RS-422 Description
1 — not used Tx(-) Transmit data (-)
2 Tx Transmit data Tx(+) Transmit data (+)
3 Rx Receive data Rx(+) Receive data (+)
4 — not used Rx(-) Receive data (-)
5 Gnd Signal ground Gnd Ground
6 — not used — not used
7 — not used — not used
8 — not used — not used
9 — not used — not used
The protocol is 9600 baud, 8-bit, 1 stop bit, no parity, and no flow control.
Commands and responses for programming the MVP 104GX from a host
system connected to the RS-232/RS-422 port are listed on the following
pages.
Host-to-MVP 104GX Communications
The MVP 104GX 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 MVP 104GX 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.
MVP 104GX-initiated messages
When a local event occurs, such as a front panel operation, the
MVP 104GX responds by sending a message to the host. The MVP 104GX-
initiated messages are listed below (underlined).
(c) Copyright 2000, Extron Electronics, MVP 104GX, Vx.xx
DB9 Pin Locations
Female
5 1
9 6 REMOTE
RS-232/RS-422