Communications - GE 745 TRANSFORMER MANAGEMENT RELAY Instruction Manual

5.3 S1 745 SETUP
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 com-
munications, each relay must be programmed with a unique address and a common baud rate.
S COMMUNICATIONS
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SLAVE ADDRESS:
254
COM1 BAUD RATE:
19200 Baud
5
COM1 PARITY:
None
COM1 HARDWARE:
RS485
COM2 BAUD RATE:
19200 Baud
COM2 PARITY:
None
FRONT BAUD RATE:
19200 Baud
FRONT PARITY:
None
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Range: 1 to 254 (steps of 1)
Enter a unique address, from 1 to 254, for this particular relay on both COM1
and COM2 serial communication links. This setpoint cannot be changed via
the communication ports. 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.
Range: 300 / 1200 / 2400 / 4800 / 9600 / 19200
Select the baud rate for COM1, the RS485/RS422 communication port. This
setpoint cannot be changed via the communication ports. 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.
Range: None / Even / Odd
The data frame is fixed at 1 start, 8 data, and 1 stop bit. If required, a parity
bit is programmable. This setpoint cannot be changed via the
communication ports. The parity of the transmitted signal must match the
parity displayed in this setpoint.
Range: RS485 / RS422
If the two-wire RS485 hardware configuration is required for the COM1 serial
communication port, select RS485 . This setpoint cannot be changed via the
communication ports. If the four wire RS422 hardware configuration is
required, select RS422 .
Range: 300 / 1200 / 2400 / 4800 / 9600 / 19200
Select the baud rate for the COM2 port. This setpoint cannot be changed via
the communication ports.
Range: None / Even / Odd
Select the parity type for the COM2 port. This setpoint cannot be changed
via the communication ports.
Range: 300 / 1200 / 2400 / 4800 / 9600 / 19200
Select the baud rate for the front panel port. This setpoint cannot be
changed via the communication ports.
Range: None / Even / Odd
Select the parity type for the front panel port. This setpoint cannot be
changed via the communication ports.
745 Transformer Management Relay
5 SETPOINTS

5.3.4 COMMUNICATIONS

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