Communications - GE TRANSFORMER MANAGEMENT RELAY 745 Instruction Manual

5.3 S1 745 SETUP
PATH: SETPOINTS S1 745 SETUP

COMMUNICATIONS

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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. 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.
• COM1/COM2 BAUD RATE: Select the baud rates for COM1, the RS485/RS422 communication port, or COM2. These
setpoints cannot be changed via the communication ports. All relays on the communication link, and the computer con-
necting 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 programma-
ble. This setpoint cannot be changed via the communication ports. 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. This setpoint cannot be changed via the communication ports. 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. These setpoints cannot
be changed via the communication ports.
5-24
Courtesy of NationalSwitchgear.com
COMMUNICATIONS
ð
SLAVE ADDRESS:
ENTER
254
ESCAPE
COM1 BAUD RATE:
ESCAPE
19200 Baud
MESSAGE
COM1 PARITY:
ESCAPE
None
MESSAGE
COM1 HARDWARE:
ESCAPE
RS485
MESSAGE
COM2 BAUD RATE:
ESCAPE
19200 Baud
MESSAGE
COM2 PARITY:
ESCAPE
None
MESSAGE
FRONT BAUD RATE:
ESCAPE
19200 Baud
MESSAGE
FRONT PARITY:
ESCAPE
None
MESSAGE
745 Transformer Management Relay
5.3.3 COMMUNICATIONS
Range: 1 to 254 in steps of 1
Range: 300, 1200, 2400, 4800, 9600, 19200 Baud
Range: None, Even, Odd
Range: RS485, RS422
Range: 300, 1200, 2400, 4800, 9600, 19200 Baud
Range: None, Even, Odd
Range: 300, 1200, 2400, 4800, 9600, 19200 Baud
Range: None, Even, Odd
5 SETPOINTS
GE Multilin