CHAPTER 5: SETPOINTS S1 745 SETUP
745 TRANSFORMER PROTECTION SYSTEM – INSTRUCTION MANUAL 5–27
Up to 32 relays can be daisy-chained and connected to a computer or a programmable
controller, using either the two-wire RS485 or the four-wire RS422 serial communication
port at the rear of the 745. Before using communications, each relay must be programmed
with a unique address and a common baud rate.
• SLAVE ADDRESS: Enter a unique address, from 1 to 254, for this particular relay on
both COM1 and COM2 serial communication links. Although addresses need not be
sequential, no two relays can have the same address. Generally each relay added to
the link will use the next higher address, starting from address 1. No address is
required to use the front panel program port since only one relay can be connected at
one time.
• COM1/COM2 BAUD RATE: Select the baud rates for COM1, the RS485/RS422
communication port, or COM2. All relays on the communication link, and the
computer connecting them, must run at the same baud rate. The fastest response is
obtained at 19200 baud.
• COM1/COM2 PARITY: The data frame is fixed at 1 start, 8 data, and 1 stop bit. If
required, a parity bit is programmable. The parity of the transmitted signal must
match the parity displayed in this setpoint.
• COM1 HARDWARE: If the two-wire RS485 hardware configuration is required for the
COM1 serial communication port, select RS485. If the four wire RS422 hardware
configuration is required, select RS422.
• FRONT BAUD RATE / FRONT PARITY: Select the baud rate / parity for the front panel
port.
5.3.3.3 DNP Communications
PATH: SETPOINTS S1 745 SETUP COMMUNICATIONS DNP
• DNP PORT: Selects the communication port for DNP communications.
• DNP POINT MAPPING: When enabled, the 120 User Map Values are included in the
DNP Object 30 point list. For additional information, refer to GE Multilin publication
DNP [] DNP PORT:
None
Range: None, COM1, COM2, Front
MESSAGE
DNP POINT MAPPING:
Enabled
Range: Enabled, Disabled
MESSAGE
TRANSMISSION DELAY:
0 ms
Range: 0 to 65000 ms in steps of 1
MESSAGE
DATA LINK CONFIRM
MODE: Never
Range: Never, Always, Sometimes
MESSAGE
DATA LINK CONFIRM
TIMEOUT: 1000 ms
Range: 1 to 65000 ms in steps of 1
MESSAGE
DATA LINK CONFIRM
RETRIES: 3
Range: 0 to 100 in steps of 1
MESSAGE
SELECT/OPERATE ARM
TIMEOUT: 10000 ms
Range: 1 to 65000 ms in steps of 1
MESSAGE
WRITE TIME INTERVAL:
0 min
Range: 0 to 65000 min in steps of 1
MESSAGE
COLD RESTART
INHIBIT: Disabled
Range: Enabled, Disabled
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