H-4
M
IRRORED
B
ITS
Communications
Date Code 20011205
SEL-311A Instruction Manual
M
IRRORED
B
ITS
P
ROTOCOL FOR THE
P
ULSAR
9600 B
AUD
M
ODEM
The user indicates that a Pulsar MBT modem is to be used by responding “MBT” to the
RTS/CTS setting prompt. When the user selects MBT, the baud rate setting will be limited 9600
baud.
The M
IRRORED
B
ITS
protocol compatible with the Pulsar MBT-9600 modem is identical to the
standard M
IRRORED
B
ITS
protocol with the following exceptions:
The relay injects a delay (idle time) between messages. The length of the delay is one relay
processing interval. Note: An idle processing interval guarantees at least 19 idle bits at 9600
baud in an SEL-321 Relay with the system frequency at 65 Hz.
The relay resets RTS (to a negative voltage at the EIA-232 connector) for M
IRRORED
B
ITS
communications using this specification. The relay sets RTS (to a positive voltage at the
EIA-232 connector) for M
IRRORED
B
ITS
communications using the R6 or original R version of
M
IRRORED
B
ITS
.
S
ETTINGS
protocol (SEL,LMD,MBA,MBB) PROTO = MBA ?
Set PROTO = MBA to enable the M
IRRORED
B
ITS
protocol channel A on this port. Set PROTO
= MBB to enable the M
IRRORED
B
ITS
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 M
IRRORED
B
ITS
messages are transmitted,
in power system cycles (~), based on the following table:
SPEED SEL-321
SEL-311A
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
enable hardware handshaking (Y,N,MBT) RTSCTS= N ?
Summary of Contents for SEL-311A
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