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
This section describes SIS communication and control. Topics that are covered include:
•Host to Scaler Communications
•Command and Responses
The scaler uses a protocol of 9600 baud, 1 stop bit, no parity, and no flow control and the rear panel
Pin | 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
(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 |
