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RS-232 Programming • Appendix A
RGB 320 Switching Interface System • User’s Manual • Extron
A-1
Remote Control Port (RS-232 and Contact Closure)
Figure A-1 shows the RS-232 port connector. This is used to connect to a host, or
to an external controlling device, such as a computer or control panel, that can
generate the proper command codes and can recognize the RGB 320 responses.
In addition to having RS-232 connections (pins 2, 3 and 5), there are also six
contact closure inputs that share the ground on pin #5.
Contact Closure Operation
A third party contact closure device can supply momentary contact between a
designated input pin and ground (pin #5), causing the RGB 320 to switch to that
input. Momentary contact is defined as having a duration of 250 to 500
milliseconds, e.g., touching pin #4 to pin #5 for the required time causes the
RGB 320 to switch to input #2.
_________ When connecting to RS-232, do not connect devices that use pins 1, 4, 6, 7, 8 or
9 for other signals or voltages. This will cause the RGB 320 to malfunction.
The RS-232 connector is a 9-pin D female connector with the following pin
designations:
Pin RS-232 Usage
1 Input #1 Contact Closure
2 Tx RS-232 Transmit Data
3 Rx RS-232 Receive Data
4 Input #2 Contact Closure
5 Gnd Signal Ground (both)
6 Input #3 Contact Closure
7 Input #4 Contact Closure
8 Input #5 Contact Closure
9 Input #6 Contact Closure
Figure A-1. Serial Port Connector Wired for Both RS-232 and Contact Closure
Commands and responses for programming the RGB 320 Switching Interface
from a host system connected to the RS-232 port are listed on the next page.
The RS-232 protocol is 9600 baud, 8-bit, 1 stop bit and no parity.
Host-to-RGB 320 Instructions
The RGB 320 will
recognize certain ASCII
characters as instructions.
It then responds to those
characters with
appropriate information.
Unrecognizable codes will
get an error code with the
response.
Figure A-2. Example of a Touch Panel Connected to the RS-232 Port
Touch-panel with
RS-232 control
RS-232/CONTACT
REMOTE