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Remote Communication
Setting Up RS-232 Communication
The RS-232 interface allows you to obtain information about the
SCP and to activate certain SCP functions from a host computer
or other device (such as a control system) attached to the rear
panel RS-232 port (shown below).
Gnd Rx Tx
J1
3-pole captive screw connector for the RS-232 port
on the SCP rear panel
Use the following protocol settings for your PC:
Baud rate: 9600
Data bits: 8
Parity: None
Stop Bits: 1
Flow Control: None
The control device (host) can use the Extron Simple Instruction
™
™
Set
(SIS
) commands.
In order to use the RS-232 port, DIP switch 4 must be
set to the "on" position.
Using Simple Instruction Set (SIS) Commands
SIS commands can be used with the SCP only when it is in
stand-alone mode; that is, DIP switch #4 on the rear panel is in
the ON position. The available commands enable you to test
the front panel LEDs and buttons, and to query for certain
information about the SCP.
You cannot program any SCP buttons or switches using
SIS commands. The SCP's buttons only reflect what is
programmed for the System 5 IP to which the SCP is
connected.
3-2
SCP 150 • Operation
Host-to-SCP 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 SCP determines that a command is valid, it
executes the command and sends a response to the host device.
Most responses from the panel to the host end with a carriage
return and a line feed (CR/LF =
the response character string. A string is one or more
characters.
SCP-initiated messages
At power-up, the following SCP-initiated message appears:
© Copyright 2004, Extron Electronics, SCP 150, Vx.xx
This message is displayed only at power-up.
When a local event such as a front panel selection takes place,
the SCP responds by sending a message to the host indicating
what selection was entered (see Switch responses on page 3-5).
No response to these messages is required from the host.
Error responses
When the SCP receives a valid SIS command, it executes the
command and sends a response to the host device. If the SCP is
unable to execute the command because the command is invalid
or contains invalid parameters, the SCP returns an error response
to the host.
Error response codes and their descriptions are shown below.
Each error response is followed by a carriage return.
E10 – Invalid command
E13 – Invalid command parameter
E23 – Bad checksum
E28 – Bad filename/File not found
Using the command/response tables
The command/response tables on the following pages list valid
command ASCII codes, the SCP's responses to the host, and a
description of the command's function or the results of
executing the command.
The ASCII to HEX conversion table on the next page is for use
with the command/response tables.
), which signals the end of
SCP 150 • Operation
3-3
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