Extron Electronics RAC 104 - Manual (Page 26)

Remote Control
RAC 104 • Remote Control
The RAC 104 can be controlled remotely via the RS-232
connector using the Extron Simple Instruction Set (SIS) or the
Extron Windows-based control program.
The RS-232 connector on the RAC 104 is a 3-pole captive screw
connector, with one pole for transmitting data, one for receiving
data, and one for the ground. Wire the RS-232 connector as
shown below.
Transmit (Tx)
Receive (Rx)
Ground (Gnd, )
RS-232 Tx Rx
RS-232 connector wiring
Pin RS-232 function Description
1 Tx Transmit data
2 Rx Receive data
3 Gnd Signal ground
RS-232 pin assignment table
The RS-232 protocol for this connector is 9600 baud, 8-bit, 1 stop
bit, no parity.
Simple Instruction Set
Host-to-controller instructions
The RAC 104 accepts SIS commands through the RS-232 port.
SIS commands consist of one or more characters per command
field. They do not require any special characters to begin or
end the command character sequence. Each controller response
to an SIS command ends 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.
Controller-initiated messages
The following copyright message is initiated by the controller
when it is first powered on. Vx.xx is the firmware version
number.
Boot V1.00,(c) 2003, ? to Enter
(c) Copyright 2003,Extron Electronics,RAC 104, Vx.xx
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