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Programmer’s Guide

MPX 423 A • Programmer’s Guide

5-2

Remote Control Port (RS-232)

The MPX 423 A matrix switcher RS-232 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 switcher’s

responses.

Female

(MPX 423 IP)

Male

(Host controller)

The cable used to connect the RS-232 port to a computer or control system may

need to be modified by removing pins or cutting wires. If unneeded pins are

connected, the switcher may hinder communication. See chapter 2,

Installation, for more information on wiring the connectors.

The RS-232 connector is a DB9 female (see illustration above) with the

following pin designations:

Pin RS-232 Description

1 — not used

2 Tx Transmit data

3 Rx Receive data

4 — not used

5 Gnd Signal ground

6 — not used

7 — not used

8 — not used

9 — not used

The protocol is 9600 baud, 8-bit, 1 stop bit, no parity, and no flow control.

The MPX 423 A is also compatible with the following baud rates: 19200,

38400, and 115200.

Commands and responses for programming the MPX 423 A from a host

system connected to the RS-232 port are listed on the following pages.

Host-to-MPX Communications

The MPX 423 A matrix switcher accepts SIS™ (Simple Instruction Set)

commands through the RS-232 port or through Telnet. 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

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.

Using the command/response table

The command/response table is shown on the following pages. Lowercase

characters are acceptable in the command field only where indicated.

Symbols are used throughout the table to represent variables in the

command/response fields. Symbol definitions are shown below, and an

ASCII-to-hexadecimal (HEX) conversion table is shown in figure 5-1.

Command and response examples are shown throughout the command/

response table.

1 2 ... 21 22 23 24 25 26 27 28 29 30 31 ... 55 56

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