R.5.22
SEL-421 Relay Reference Manual Date Code 20111215
SEL Communications Protocols
SEL Distributed Port Switch Protocol (LMD)
Operation
The following steps describe how to use the LMD operation of the SEL-2885:
Step 1. When you send the prefix and address, the SEL-2885 enables
echo and message transmission.
You must wait until you receive a prompt before entering
commands to avoid losing echoed characters while the external
transmitter is warming up.
Step 2. You can use the commands that are available for the protocol
setting of the port where the SEL-2885 is installed.
Step 3. If the port PROTO setting is set to SEL, you can use the QUIT
command to terminate the connection.
If no data are sent to the relay before the port time-out period,
this command automatically terminates the connection.
Step 4. If all relays in the multidrop network do not have the same
prefix setting, enter the sequence <Ctrl+X> QUIT <Enter>
before entering the prefix character to connect to another
device.
Table 5.19 SEL-2885 Initialization String [MODE PREFIX ADDR:SPEED]
Field
Optional or
Required
Value Description
[ Required [ Opening bracket is start of string
Mode Optional Not specified
N
B
Treat as N, below
Addressing for ASCII device
Addressing for binary devices
PREFIX Required @, #, $, %, or & Prefix character
ADDR Required 01–99 Two digit address in the range
01-99
: Optional; needed if
SPEED is specified
Colon “:” Colon “:”, then one of the
following codes to match the port
SPEED setting
SPEED Optional 12
24
48
96
1200 bps
2400 bps
4800 bps
9600 bps
] Required ] Closing bracket is end of string
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