9.65
Date Code 20120126 Instruction Manual SEL-2032 Communications Processor
Protocols
LMD Distributed Port Switch Protocol
would have to increase to more than 1024 or decrease to less than 1004 (a
dead band of 0.2 amps) for the SEL-2032 to report a new event value.
As with the DNP3 serial connection, the NUMEVE and AGEEVE settings are
used to decide when to send unsolicited data to the master. The SEL-2032
sends an unsolicited report when the total number of events accumulated in
the event buffer reaches NUMEVE.
The SEL-2032 also sends an unsolicited report if the age of the oldest event in
the buffer exceeds AGEEVE. The SEL-2032 uses the same buffer capacities
with DNP3 over Ethernet as through the serial connection, listed in Table 6.5.
Time
Synchronization
Time synchronization is not supported for DNP3 over the Ethernet port.
However, SEL-2032 will accept messages that contain a Record Current Time
(Function Code 24) request and return a Null Response.
LMD Distributed Port Switch Protocol
This protocol permits multiple SEL devices 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 SET P command to activate the multidrop protocol. Change the
PROTOCOL port setting from the default SEL to LMD to reveal the following
settings:
ADDRESS Two-character ASCII address. The range is “01” to “81.” The
default is “01.” This address represents the first of 17 addresses that
the SEL-2032 will use. The first address will connect you to the
SEL-2032 in command/response mode. The subsequent 16 addresses
will connect you directly to the respective port.
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 “@.”
SETTLE TIME Time in seconds that transmission is delayed after the request
to send (RTS line) asserts. This delay accommodates transmitters with
a slow rise time.
Operation
1. The device ignores all input from this port until it detects the
prefix character and the two-byte address.
2. The device then asserts the RTS line, which you can use to key
a serial data transmitter. The port enables echo and message
transmission. If the port has received an XOFF character, the
device performs as if it received an XON.
3. Wait until you receive a prompt before entering commands to
avoid losing echoed characters while the external transmitter is
warming up.
Courtesy of NationalSwitchgear.com
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