Serial Communication
SVS 100 Serial Communication
5-2

Remote Control Port (RS-232/RS-422)

The SVS 100 RS-232/RS-422 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 SVS 100 responses.
The SVS 100 comes from the factory already configured for RS-232. To set the
SVS 100 for RS-422 operation, please see “Configuring the SVS 100 for
RS-422” in the Appendix.
The RS-232/RS-422 connector is a 9-pin D female (see illustration above)
with the following pin designations:
Pin RS-232 Description RS-422 Description
1 — not used Tx(-) Transmit Data (-)
2 Tx Transmit Data Tx(+) Transmit Data (+)
3 Rx Receive Data Rx(+) Receive Data (+)
4 — not used Rx(-) Receive Data (-)
5 Gnd Signal Ground Gnd Ground
6 — not used — not used
7 — not used — not used
8 — not used — not used
9 — not used — not used
The protocol is 9600 baud, 8-bit, 1 stop bit, no parity, and no flow control.
Commands and responses for programming the SVS 100 from a host system
connected to the RS-232/RS-422 port are listed on the following pages.

Host-to-SVS 100 Communication

The SVS 100 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 SVS 100 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.

SVS 100-initiated messages

When a local event occurs, such as a front panel operation, the SVS 100
responds by sending a message to the host. The SVS 100-initiated messages
are listed below (underlined).
(c) Copyright 2000, Extron Electronics, SVS 100, V
x.xx
The copyright message is initiated by the SVS 100 when it is first powered
on. Vx.xx is the firmware version number.
DB9 Pin Locations
Female
51
96
REMOTE
RS-232/RS-422