Table I.4 Mirrored Bits Communications Message Transmission Period; Table I.5 Mirrored Bits Protocol Settings - Schweitzer Engineering Laboratories SEL-787 Instruction Manual

M
IRRORED
NOTE:
You must consider the idle
time in calculations of data transfer
latency through a Pulsar MBT modem
system.
Settings
Date Code 20081022
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
COMMUNICATIONS Command
information.
B Protocol for the Pulsar 9600 Baud Modem
ITS
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.
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).
Table I.4 M B Communications Message Transmission Period
IRRORED ITS
PROTO ≠ MBTA or MBTB
Baud
38400 4 times a power system cycle
19200 4 times a power system cycle
9600 4 times a power system cycle
4800 7.5 ms
The relay sets RTS to a negative voltage at the EIA-232 connector to signify
that M B communications matches this specification.
IRRORED ITS
Set PROTO = MBA or MB8A to enable the M
A on this port. Set PROTO = MBB or MB8B to enable the M
protocol channel B on this port. The standard M
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
operate on communication channels requiring an 8-data bit format. For the
remainder of this section, PROTO = MBA is assumed.
M B protocol port settings, ranges, and default settings for Port F,
IRRORED ITS
Port 3, and Port 4.
Table I.5 M B Protocol Settings (Sheet 1 of 2)
IRRORED ITS
Setting
Setting Description
Prompt
TXID M B
IRRORED ITS
RXID M B
IRRORED ITS
RBADPU Outage Duration to Set RBAD (0–10000 seconds)
CBADPU Channel Unavailability to Set CBAD (1–10000 ppm)
RXDFLT 8 char string of 1s, 0s, or Xs
RMB1PU RMB1 Pickup Debounce Messages (1–8 messages)
RMB1DO RMB1 Dropout Debounce Messages (1–8 messages)
Instruction Manual
M
in Section 7: Communications
Table I.4
PROTO = MBTA or MBTB
n/a
n/a
2 times a power system cycle
n/a
IRRORED
IRRORED
ID of This Device (1–4)
ID of Device Receiving From (1–4)
B Communications I.5
IRRORED ITS
Settings
for more
shows the
B protocol channel
ITS
B
IRRORED ITS
B protocols MBA
ITS
B to
IRRORED ITS
Table I.5 shows the
Factory
Default
Setting
2
1
60
1000
XXXXXXXX
1
1
SEL-787 Relay