Serial Communication, cont’d
System 5
cccccrrrrr
Plus • Serial Communication
4-2
Serial Communication
The System 5
cr
Plus can be remotely controlled via a host computer or other device
(such as a control system) attached to the rear panel RS-232 connector. The control
device (host) can use either Extron’s Simple Instruction Set (SIS) commands or the
graphical control program for Windows.
The System 5 switcher uses a protocol of 9600 baud, 1 stop bit, no parity, and
no flow control.
The rear panel RS-232 9-pin D connector has the following pin assignments:
Pin
RS-232 function
Description
2
Tx
Transmit data
3
Rx
Receive data
5
Gnd
Signal ground
DB9 Pin Locations
Female
5
1
9
6
RS-232 Programmer’s Guide
Host-to-switcher 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 System 5
cr
Plus
determines that a command is valid, it executes the command and sends a
response to the host device. All responses from the switcher 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.
Switcher-initiated messages
When a local event such as a front panel (or SCP control pad) selection or
adjustment takes place, the System 5 switcher responds by sending a message to
the host. No response is required from the host. The switcher-initiated messages
are listed here (underlined).
(C) Copyright 2000, Extron Electronics, System 5cr Plus, Vx.xx
The System 5 sends the copyright message when it first powers on. Vx.xx is the
firmware version number.
RECONFIG
When a change is made via a front panel control or another operation occurs that
must be written to a new memory block, the System 5 sends the reconfiguration
message. No response is required from the RS-232 host, but the host may request a
new status listing via the request information command (I/i). See the command/
response table in this chapter for details.
C
X1
(where
X1
is the input number)
The System 5 sends this response when an input is switched. C = both audio and
video were switched.
Error responses
When the switcher receives a valid SIS command, it executes the command and
sends a response to the host device. If the System 5 is unable to execute the
command because the command is invalid or it contains invalid parameters, it
returns an error response to the host.
im Vertrieb von
CAMBOARD Electronics
www.camboard.de
Tel. 07131 911201
Fax 07131 911203
