J.6
SEL-311C Relay Instruction Manual Date Code 20060320
MIRRORED BITS Communications
Settings
Settings
protocol (SEL,LMD,MBA,MBB,MB8A,MB8B,MBGA,MBGB) PROTO = MBA ?
Set PROTO = MBA to enable the MIRRORED BITS protocol channel A on this
port. Set PROTO = MBB to enable the M
IRRORED BITS protocol channel B on
this port. For the remainder of this section, PROTO = MBA is assumed.
baud rate (300-38400) SPEED = 9600 ?
Use the SPEED setting to control the rate at which the MIRRORED BITS
messages are transmitted, in power system cycles (~), based on the following
table:
enable hardware handshaking (Y,N,MBT) RTSCTS= N ?
Use the MBT option if you are using a Pulsar MBT 9600 baud modem. With
this option set, the relay will transmit a message every 1/2-power system cycle
and the relay will deassert the RTS signal on the EIA-232 connector. Also, the
relay will monitor the CTS signal on the EIA-232 connector, which the
modem will deassert if the channel has too many errors. The modem uses the
relay’s RTS signal to determine whether the new or old M
IRRORED BITS
protocol is in use.
Mirrored Bits Receive bad pickup (1-10000 sec) RBADPU= 60 ?
Use the RBADPU setting to determine how long a channel error must last
before the relay element RBADA is asserted. RBADA is deasserted when the
channel error is corrected.
Mirrored Bits Channel bad pickup (1-10000 10E-6) CBADPU= 1000 ?
Use the CBADPU setting to determine the ratio of channel down time to the
total channel time before the relay element CBADA is asserted. The times
used in the calculation are those that are available in the COMM records. See
the COM command in the SEL-321 Instruction Manual or COM Command
(Communication Data) on page 10.16 for a description of the COMM records.
Speed SEL-321 SEL-311C
38400 1 message per 1/8 cycle 1 message per 1/4 cycle
19200 1 message per 1/8 cycle 1 message per 1/4 cycle
9600 1 message per 1/4 cycle 1 message per 1/4 cycle
4800 1 message per 1/2 cycle 1 message per 1/2 cycle
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