Extron electronic 42 HVA manual Programmer’ser’sGuide,Guidecont’d, Host-to-Switcher Instructions

Programmer’ser’sGuide,Guidecont’d

The switcher’s rear panel RS-232 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. Remote communications with the CrossPoint 42 are via Extron’s Simple Instruction Set (SIS) or using Extron’s Windows-based control program.

1	6	6	1
5	9	9	5

Female Male

Figure 4-1 — RS-232 connector pin arrangement

The RS-232 connector on the CrossPoint 42 is a 9-pin D female connector with the following pin assignments.

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

Host-to-Switcher Instructions

Pin	RS-232	Function
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 switcher accepts SIS commands through the RS-232 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).

(C) Copyright 2002, Extron Electronics “CrossPoint 42 HVA”, Vx.xx

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

4-2 CrossPoint 42 HVA Matrix Switcher • Programmer’s Guide