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SIS Communication
and Control
The DVS 304 can configured and controlled via a host computer or other device (such as
a control system) attached to the rear panel RS-232 connector or the LAN port. Control is
made using the Extron Simple Instruction Set (SIS
Processing Products Control Program (SPPCP), or the devices internal HTML Web pages.
This section describes SIS communication and control. Topics that are covered include:
•
•
The scaler uses a protocol of 9600 baud, 1 stop bit, no parity, and no flow control and the
rear panel RS-232 9-pin, D connector has the following pin assignments:
NOTE: If contact closure is not in use, pins 1, 4, 6, and 7 should have no connection.
Host to Scaler Communications
SIS commands consist of one or more characters per field. No special characters are
required to begin or end a command sequence. When the DVS 304 determines that a
command is valid, it executes the command and sends a response to the host device.
All responses from the scaler to the host end with a carriage return and a line feed
(CR/LF = ]), signalling the end of the response character string (one or more characters).
Scaler-initiated Messages
When a local event such as a front panel selection or adjustment takes place, the DVS 304
scaler responds by sending a message to the host. No response is required from the host.
Some scaler-initiated messages are listed here.
(C) Copyright 2010, Extron Electronics, DVS 304 series, Vx.xx ] The DVS 304 sends
the copyright message when it first powers on. Vx.xx is the firmware version number.
In X! All ]
Reconfig ] (where X! is the input number). The DVS 304 sends this response when an
input is switched or when a new signal is detected.
Host to Scaler Communications
Command and Responses
Pin
RS-232 Function
1
Input #1
2
Tx
3
Rx
4
Input #2
5
Gnd
6
Input #3
7
Input #4
8
-
9
-
DVS 304 Series • SIS Communication and Control
™
) of commands, or by using the Signal
Description
Contact closure
Transmit data
Receive data
Contact closure
Signal ground
Contact closure
Contact closure
No connection
Reserved
30
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