IN1404 User’s Manual
29
Remote Operation
RS-232 control
The IN1404 RS-232 serial control port accepts serial commands from a control system, computer serial
port, or any other device capable of sending out serial ASCII commands at compatible baud rates. A
complete listing of RS-232 codes is included on the following pages.
Communication Protocol
:
•
8 data bits
•
1 stop bit
•
No parity check
•
9600 baud (factory default setting)
Baud Rate Selection
:
The IN1404 has a factory default baud rate of 9600 bps and can communicate at baud rates from 1200
up to 57,600. Baud rates can be selected using the
Advanced menu
(see page 18).
The baud rate transmitted must match the baud rate selected on the IN1404.
Command Code Structure and Delimiters:
All commands sent to the unit must contain a leading code, the command code, and an ending code.
Each command must be completely executed before the unit will accept a new command.
Extron scalers can be set to recognize six sets of leading and end codes (delimiters) when using an
RS-232 remote:
parentheses ( )
,
brackets [ ]
,
braces { }
,
slashes \ /
,
less and greater than < >
, and
signs
!#
. The factory default serial delimiters are
[ ]
.
Only the IN1404
that has the same delimiters as the remote controller will respond.
A complete command consists of:
The leading code (e.g.,
[
)
The command code.(e.g.,
CH3
)
The ending code (e.g.,
]
)
Example:
[CH3] commands the IN1404
to select channel 3.
Serial Control Cable Wiring
:
When controlling only one IN1404 unit, connect the RS-232 cable as follows:
Controller Transmit
to
IN1404 Receive
Controller Ground
to
IN1404 Ground
Controller Receive to
IN1404 Transmit
When controlling multiple IN1404 units, connect the RS-232 cable as follows:
Controller Transmit
to
Each IN1404 Receive
Controller Ground
to
Each IN1404 Ground
Controller Receive
to
Only one IN1404 Transmit
When controlling multiple units, the Controller Receiver Terminal must connect to only one
IN1404 Transmit Terminal. Multiple IN1404 transit lines may not be connected together,
otherwise signal contention from multiple units will result. Therefore, “receive” information is
available only from one IN1404 in this configuration. Each unit must be set to different
delimiters.
