Date Code 20170601 Instruction Manual SEL-387-0, -5, -6 Relay
Appendix C
SEL Distributed Port
Switch Protocol (LMD)
Overview
SEL Distributed Port Switch Protocol (LMD) permits multiple SEL relays to
share a common communications channel. It is appropriate for low-cost, low-
speed port switching applications where updating a real-time database is not a
requirement.
Settings
Use the front-panel {SET} pushbutton or the serial port SET P command to
activate the LMD protocol. Change the port PROTO setting from the default
SEL to LMD to reveal the following settings:
PREFIX: One character to precede the address. This should be a character
which does not occur in the course of other communications with the
relay. Valid choices are one of the following:
➤ @
➤ #
➤ $
➤ %
➤ &
The default is @.
ADDR: Two character ASCII address. The range is “01” to “99.” The
default is “01.”
SETTLE: Time in seconds that transmission is delayed after the request
to send (RTS line) asserts. This delay accommodates transmitters with a
slow rise time.
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