10-8 Serial Port Communications and Commands Date Code 990215
SEL-351P Manual Técnico
The CAN character (ASCII hex 18) aborts a pending transmission. This is useful in termi-
nating an unwanted transmission.
Control characters can be sent from most keyboards with the following keystrokes:
XON: <CNTRL> Q (hold down the Control key and press Q)
XOFF: <CNTRL> S (hold down the Control key and press S)
CAN: <CNTRL> X (hold down the Control key and press X)
SEL Distributed Port Switch Protocol (LMD)
The SEL Distributed Port Switch Protocol (LMD) permits multiple SEL devices to share a
common communications channel. You select this protocol with the Access Level 2 SET P
command by setting PROTO = LMD. See Appendix C: SEL Distributed Port Switch Protocol
for more information on SEL Distributed Port Switch Protocol (LMD).
SEL Fast Meter Protocol
SEL Fast Meter protocol supports binary messages to transfer metering and control messages.
The protocol is described in Appendix D: Configuration, Fast Meter, and Fast Operate
Commands. There are no settings required to implement or control this protocol. It is available
on any SEL-351P port that is set for SEL or LMD protocol.
SEL Compressed ASCII Protocol
SEL Compressed ASCII protocol provides compressed versions of some of the recloser control
ASCII commands. The protocol is described in Appendix E: Compressed ASCII Commands.
There are no settings required to implement or control this protocol. It is available on any
SEL-351P port that is set for SEL or LMD protocol.
Distributed Network Protocol (DNP) V3.00
The control provides Distributed Network Protocol (DNP) V3.00, Level 2 slave support. DNP is
an optional protocol and is described in Appendix H: Distributed Network Protocol (DNP)
V3.00.
S
ERIAL
P
ORT
A
UTOMATIC
M
ESSAGES
When the serial port AUTO setting is Y, the recloser control sends automatic messages to
indicate specific conditions. The automatic messages are described in
Table SECTION 10: .4.
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