15.38
SEL-400 Series Relays Instruction Manual Date Code 20171006
Communications Interfaces
SEL Distributed Port Switch Protocol (LMD)
EIA-485 Transceiver product flier for more information on the settings, configu-
ration, and application of the SEL-2885. (Contact your local technical service
center, the SEL factory, or visit our website at selinc.com for a copy of the
SEL-2885 product flier.)
Initialization
For the first 30 seconds after applying power to the relay, the SEL-2885 listens
for an initialization string from the relay. The initialization string must be
enclosed in square brackets ([ ]). The following table describes the initialization
string fields. To send this string automatically, set AUTO to Y and append the
initialization string to the relay ID setting so that it is included in the relay power-
up header.
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 com-
mand 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 set-
ting, enter the sequence <Ctrl+X> OR QUIT <Enter> before enter-
ing the prefix character to connect to another device.
Table 15.28 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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