Extron electronic MAV User Manual download pdf (Page 46)

Programmer’s Guide, cont’d

MAV Series Switchers • Programmer’s Guide4-2

Programmer’s Guide

The switcher’s rear panel RS-232/RS-422 connector (figure 4-1) can be connected to

the serial port output of a host device such as a computer or control system. This

connection makes software control of the switcher possible.

Female

Male

Figure 4-1 — MAV switcher RS-232 connector pin arrangement

The MAV Series Switchers are factory configured for RS-232 control. To use

the switcher under RS-422 control, an internal cable must be moved. See

Appendix B for the procedure for shifting the cable.

The RS-232/RS-422 connector on the MAV Series switcher is a 9-pin D female

connector with the following pin assignments.

niP 232-SR noitcnuF 224-SR noitcnuF

1— desutoN-XT)-(atadtimsnarT

2XTatadtimsnarT+XT)+(atadtimsnarT

3XRatadevieceR+XR)+(atadevieceR

4 — desutoN -XR )-(atadevieceR

5 dnG dnuorglangiS dnG dnuorglangiS

6 — desutoN — desutoN

7— desutoN—desutoN

8— desutoN—desutoN

9— desutoN—desutoN

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).

The copyright message is initiated by the switcher when it is first powered on.

Vx.xx is the firmware version number.

Reconfig

The reconfig message is initiated by the switcher when a front panel operation has

occurred, an audio gain adjustment has been completed, or a memory preset has

been recalled.

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Extron electronic MAV User Manual Page 46