Extron electronic DVS 150 Serial Communication, RS-232 Programmer’s Guide, DVS initiated messages

Serial Communication

The scaler’s RS-232 connector 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 scaler possible. Figure 10 shows a scaler RS-232 connection to a host serial port connector.

DVS 150

Figure 10 — Scaler RS-232 to host connection

The RS-232 connector on the scaler is a 9-pin D female connector with the following pin assignments:

Pin Description

1Input 1 select*

2Transmit data

3Receive data

4Input 2 select*

5Signal ground

6Input 3 select*

7Input 4 select*

8Not used

9Not used

*Used for remote contact closure control

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

The scaler accepts SIS™ (Simple Instruction Set™) 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 scaler 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.)

RS-232 Programmer’s Guide

DVS initiated messages

When a local event occurs, such as a front panel operation, the scaler responds by sending a message to the host. The DVS-initiated messages are listed below (underlined).

(C) Copyright 1999, Extron Electronics, DVS 150, Vx.xx

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

Reconfig

The Reconfig message is initiated by the scaler when a new input is selected or when any image adjustment is made.

The scaler does not expect a response from the host, but, for example, the host program might request a new status.

4-2 DVS 150 Serial Communication