Operating instructions

Extron • System 8/10 PLUS • User’s Manual
RS-232 Programming Guide
Protocol
A-1
Programming the System 8/10 PLUS
This section covers the commands for a host to set up and control the System 8/
10 PLUS by way of the RS-232 port.
RS-232 Connections
A standard RS-232 port is available on the back of the System 8/10 PLUS for use
by a host. The connections are as follows:
RS-232 Pin Connections
Pin Signal Pin Signal Pin Signal
1—4—7—
2 Tx 5 Gnd 8 —
3Rx6 —9—
RS-232 Protocol
The default protocol is 9600 baud, 8-bits, no parity and 1 stop bit. The baud rate
can be changed by setting an internal rotary switch.
_____ If the Host baud rate needs to be changed, go to B-3 and B-4.
Program Instructions
The System 8/10 PLUS openly recognizes any character that comes in on the
RS-232 port as a possible command. The characters shown in the Command/
Response table on page A-4 are the only valid commands that are recognized by
the System 8/10, any other character sent as a command will result in an error
response to the Host.
Simple Instruction Set
The Simple Instruction Set can be any ASCII character that is recognized by the
System 8/10 PLUS as a command. For this set, there are no codes required to
say that a command is coming or that a command has ended. Simple commands
could be from a terminal or any other controlling device. The System 8/10 PLUS
will execute the command and send a response back to the controlling device.
A simple command may be a single character typed on a keyboard and does not
require any special characters before or after (i.e. It is not necessary to press
“enter” from the keyboard.). However, some command characters may be
followed by a “delimiter” character which defines a specific request. The
System 8/10 PLUS looks at any character that comes in on the RS-232 port as a
possible command.