User's Manual

SEL-3031 Instruction Manual Date Code 20091009
Job Done Examples
High-Speed Teleprotection or Control With M
IRRORED BITS Communications
3.4
SEL-400 Series MIRRORED BITS Settings
The required port settings for SEL-400 series relays are shown below. To establish
communication via the radio, the most critical settings are PROTO, MBT, SPEED,
STOPBIT, TXID, RXID, and TXMODE. All other settings are per the application
requirements.
Protocol Selection
PROTO := MBA
Communications Settings
MBT := N SPEED :=19200 STOPBIT := 2
Mirrored Bits Protocol Setting
TX_ID := 2 RX_ID := 1 RBADPU := 10 CBADPU := 20000
TXMODE := P MBNUM := 8 RMB1FL := P RMB1PU := 1
RMB1DO := 1 RMB2FL := P RMB2PU := 1 RMB2DO := 1
RMB3FL := P RMB3PU := 1 RMB3DO := 1 RMB4FL := P
RMB4PU := 1 RMB4DO := 1 RMB5FL := P RMB5PU := 1
RMB5DO := 1 RMB6FL := P RMB6PU := 1 RMB6DO := 1
RMB7FL := P RMB7PU := 1 RMB7DO := 1 RMB8FL := P
RMB8PU := 1 RMB8DO := 1
Figure 3.4 SEL-451 Port Settings for MIRRORED BITS Connection
Set PROTO equal to MBx, where x equals A or B depending on which MIRRORED BITS
channel is being used. Set MBT equal to N to disable that option.
Set SPEED equal to 19200 (or 9600 if the encryption card is installed).
Set STOPBIT equal to 2.
NOTE: If you are using the SEL-3044 Encryption Card, you
must change the connected devices’ RMBxPU and
RMBxDO settings = 2 to maintain the same level of
channel security as the standard MB8 protocol. This will
delay operation by one processing interval but will give
you a higher level of channel security.
Set the RXID equal to one and TXID equal to two at the master end. At the remote end,
set the RXID equal to two and the TXID equal to one. The relays use these addresses
so that the master relay only receives messages sent by a relay with the matching
transmit address and vice versa.
Set TXMODE equal to P (Paced).
To connect the relay to the radio, use an SEL-C285 cable (DB-9 male-to-DB-9 male
straight-through). If complete electrical isolation is desired between the radio and
antenna and the relay’s EIA-232 communications port, use the SEL-2812MR Fiber-
Optic Transceiver and fiber-optic cable to connect the relay to the radio.