Extron electronic MMX 32 VGA A Remote Control, RS-232 Control, Simple Instruction Set control

Remote Control

The switcher’s rear panel Remote connector can be connected to the serial port output of a host device such as a computer or control system, or to a contact closure device such as the Extron MMX 32 AAP panel (part #70-277-01, -11, or -21) or

MMX 32 MAAP panel (part #70-277-12 or -22).

RS-232 Control

The RS-232 Remote connection makes software control of the switcher possible via the Extron Simple Instruction Set (SIS) or the Extron Windows®-based control program.

The Remote connector on the MMX 32 VGA A is a female

9-pin D connector (figure 3-1). Pins not used for RS-232 control are assigned to contact closure control as described later in this chapter. The Remote connector pin assignments are listed in the table below.

5	1	1		5
9	6		6	9
Female				Male

Figure 3-1 — Remote connector pin arrangement

For RS-232 use only pins 2, 3, and 5.

Remote connector pin assignment table

Pin	RS-232	Contact closure	Function
1	—	In#1/Out#1	Tie input 1 to output 1
2	TX	—	Transmit data (-)
3	RX	—	Receive data (+)
4	—	In#2/Out#1	Tie input 2 to output 1
5	Gnd	Gnd	Signal ground
6	—	In#3/Out#1	Tie input 3 to output 1
7	—	In#1/Out#2	Tie input 1 to output 2
8	—	In#2/Out#2	Tie input 2 to output 2
9	—	In#3/Out#2	Tie input 3 to output 2

The RS-232 protocol for this connector is 9600 baud, 8-bit, 1 stop bit, no parity.

Simple Instruction Set control

Host-to-switcher instructions

The switcher accepts SIS commands through the remote connector. 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 message

The following copyright message is initiated by the switcher when it is first powered on. Vx.xx is the firmware version number.

(C) Copyright 2003, Extron Electronics, MMX 32 VGA A, Vx.xx

Switcher error responses

When the switcher receives an SIS command and determines that it is valid, it performs the command and sends a response to the host device. If the switcher is unable to perform the command because the command is invalid or contains invalid parameters, the switcher returns an error response to the host. The error response codes are:

E01 — Invalid input channel number (too large)

E10 — Invalid command

E12 — Invalid output number (too large)

E13 — Invalid value (out of range)

3-2 MMX 32 VGA A • Remote Control MMX 32 VGA A • Remote Control 3-3