I.5
Date Code 20100129
Instruction Manual
SEL-751A Relay
M
IRRORED
B
ITS
Communications
Settings
Use the CBADPU setting to determine the ratio of channel down time to the
total channel time before the meter element CBADA is asserted. The times
used in the calculation are those that are available in the COM records. See the
for more
information.
M
IRRORED
B
ITS
Protocol for the Pulsar 9600 Baud Modem
To use a Pulsar MBT modem, set setting PROTO := MBTA or MBTB (Port
settings). Setting PROTO := MBTA or MBTB hides setting SPEED (forces
the baud to 9600), hides setting PARITY (forces parity to a value of 0), hides
setting RTSCTS (forces RTSCTS to a value of N), and forces the transmit
time to be faster than double the power system cycle.
shows the
difference in message transmission periods when not using the Pulsar modem
(PROTO
≠
MBTA or MBTB), and using the Pulsar MBT modem (PROTO =
MBTA or MBTB).
NOTE:
You must consider the idle
time in calculations of data transfer
latency through a Pulsar MBT modem
system.
The relay sets RTS to a negative voltage at the EIA-232 connector to signify
that M
IRRORED
B
ITS
communications matches this specification.
Settings
Set PROTO = MBA or MB8A to enable the M
IRRORED
B
ITS
protocol channel
A on this port. Set PROTO = MBB or MB8B to enable the M
IRRORED
B
ITS
protocol channel B on this port. The standard M
IRRORED
B
ITS
protocols MBA
and MBB use a 6-data bit format for data encoding. The MB8 protocols
MB8A and MB8B use an 8-data bit format, which allows M
IRRORED
B
ITS
to
operate on communication channels requiring an 8-data bit format. For the
remainder of this section, PROTO = MBA is assumed.
shows the
M
IRRORED
B
ITS
protocol port settings, ranges, and default settings for Port F,
Port 3, and Port 4.
Table I.4
M
IRRORED
B
ITS
Communications Message Transmission Period
Baud
PROTO
≠
MBTA or MBTB
PROTO = MBTA or MBTB
38400
4 times a power system cycle
n/a
19200
4 times a power system cycle
n/a
9600
4 times a power system cycle
2 times a power system cycle
4800
7.5 ms
n/a
Table I.5
M
IRRORED
B
ITS
Protocol Settings
(Sheet 1 of 2)
Setting
Prompt
Setting Description
Factory
Default
Setting
TXID
M
IRRORED
B
ITS
ID of This Device (1–4)
2
RXID M
IRRORED
B
ITS
ID of Device Receiving From (1–4)
1
RBADPU
Outage Duration to Set RBAD (0–10000 seconds)
60
CBADPU
Channel Unavailability to Set CBAD (1–10000 ppm)
1000
RXDFLT
8 char string of 1s, 0s, or Xs
XXXXXXXX
RMB1PU
RMB1 Pickup Debounce Messages (1–8 messages)
1
RMB1DO
RMB1 Dropout Debounce Messages (1–8 messages)
1
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