Sis communication and control, Host to scaler communications, Scaler-initiated messages – Extron Electronics DVS 304 Series User Guide User Manual
Page 35
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
™
) of commands, or by using the Signal
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:
Pin
RS-232 Function
Description
1
Input #1
Contact closure
2
Tx
Transmit data
3
Rx
Receive data
4
Input #2
Contact closure
5
Gnd
Signal ground
6
Input #3
Contact closure
7
Input #4
Contact closure
8
-
No connection
9
-
Reserved
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.
DVS 304 Series • SIS Communication and Control
30