SWITCHERS
400-0099-003
10
Typically, a control system or computer will offer
RS-232 connections on a 9-pin D connector.
The following are typical cable pin-out designations
for RS-232 connections on a 9-pin D connector.
Always verify that the pin-outs for your system are
correct to ensure the proper wiring.
Computer 25-pin D to MX2456RM
Computer Pin No.
MX2456RM Contact
3
RX
2
TX
7
GND
Computer 9-pin D to MX2456RM
Computer Pin No
MX2456RM Contact
2
TX
3
RX
5
GND
Port setting preferences for the control system or
computer being used to control the switcher should
be set as follows:
BAUD RATE (Bits per second)
9600
Data bits
8
Parity
None
Stop Bits
1
Flow Control
None
7.2.1 RS-232 PROTOCOL
The RS-232 protocol for the
MX2456RM
Switcher uses a simple ASCII character format.
1. Square brackets “[ ]” are part of the
command.
2. Use uppercase letters for all commands.
3. Make sure that there is a delay of 50 ms
between two consecutive commands.
The RS-232 input has a 16-character buffer and
the
MX2456RM
will not execute any commands
longer than 16
characters. Any additional
commands are ignored until the previous
command is fully processed. After processing a
valid command, a text string that includes the
Unit ID and “OK” will be returned.
Example:
[1OK]
1
= Unit ID
OK
= Command executed
This is the typical feedback, unless otherwise
indicated.
7.2.2 PROGRAMMING COMMANDS
1.
[0I#]
– Change ID Number
This command sets a unique ID number to each
MX2456RM
Switcher being used. A maximum of
9 unit IDs can be assigned.
0 = Zero
# = Unit ID number. (# from 1-9)
Example:
Sending the command [0I1] will reset the active
switcher with a new ID number of 1. In addition,
by default the switcher still has an ID number of
zero.
2.
[#VR]
– Firmware Version
This command displays the firmware revision
number installed in the microprocessor.
# =
Unit ID (# from 1-9, default is 0)
Example:
Check the firmware revision of Unit ID 1 by
sending the command [1VR]. The system will
return feedback similar to the following:
[1R1.0]
If the user sends the [0VR] command, each unit
will return its version.
