MVC 121• Remote Control
MVC 121• Remote Control
Remote Control
3-3
is invalid or it contains invalid parameters, it returns an error
response to the host.
The error response codes and their descriptions are as follows:
E01 – Invalid channel number
E10 – Invalid command
E13 – Invalid value (the number is out of range)
E14 – Invalid command at this time (input on/off command not
valid during contact closure mute)
E23 – Firmware update failure
Using the command/response table
The command/response table lists valid command ASCII codes,
the MVC’s responses to the host, and a description of the
command’s function or the results of executing the command.
Lower case characters are acceptable in the command field only
where indicated. The ASCII to HEX conversion table below is
for use with the command/response table.
ASCII to HEX Conversion Table
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RS-232 Programmer’s Guide
The MVC 121 can be remotely controlled via a host
computer attached to the rear panel’s 3-pole captive
screw RS-232 connector. The protocol is 9600 baud,
1 stop bit, no parity, and no flow control.
The RS-232 control device (host) can use either Extron’s Simple
Instruction Set (SIS) commands or the graphical control
program for Windows. Windows control software is included
with the MVC.
The rear panel’s RS-232 3-pole female connector has the
following pin assignments:
Pin
RS-232 function
Description
1
Tx
Transmit data
2
Rx
Receive data
3
Gnd
Signal ground
Host-to-MVC communications
SIS commands consist of one or more characters per field. No
special characters are required to begin or end a command
sequence. When a command is valid, the MVC executes the
command and sends a response to the host device. All respon-
ses from the MVC to the host end 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.
MVC-initiated messages
When a local event such as a front panel or contact closure
selection or adjustment takes place, the MVC sends a message
to the host. No response is required from the host. One MVC-
initiated message is listed here (underlined).
(C) Copyright 2004, Extron Electronics, MVC 121, V x.xx
The MVC issues the copyright message when it first powers on.
V x.xx is the firmware version number.
Other examples of unsolicited responses are indicated in the SIS
command/response table by a following every description of
a response that could also be an unsolicited response.
Error responses
When the MVC 121 receives a valid SIS command, it executes
the command and sends a response to the host device. If the
MVC is unable to execute the command because the command
RS-232
Tx Rx
The command/response table uses symbols (defined below) to
represent variables.
The SIS on/off commands and the equivalent front panel
operations have equal priority. The MVC will respond
to the latest settings from either SIS commands or front
panel operations.
Symbol definitions
= CR/LF (carriage return/line feed) (hex 0D 0A)
•
= Space
= Every response that could also be an unsolicited response
will have this symbol at the end of each description of that
response.
X1
= Master (output) volume adjustment range (0 – 92),
default = 50 (-30 dB), gain (dB) =
X1
- 80
im Vertrieb von
CAMBOARD Electronics
www.camboard.de
Tel. 07131 911201
Fax 07131 911203
