Date Code 20010719 701 Motor Protection Relay
Settings Calculation
Serial Port Settings
4.51
normally be connected to any device while the relay is in service, set Send Auto
Messages to Port setting equal to N.
The relay EIA-232 serial ports support software (XON/XOFF) flow control. If
you wish to enable support for hardware (RTS/CTS) flow control, set the Enable
Hardware Handshaking setting equal to Y.
The SEL-701 Relay can accept binary commands to operate output contacts, set
and clear logic conditions, or start and stop the motor when the Fast Operate Enable
setting equals Y. This is a particularly useful function when the relay is connected to an
SEL Communications Processor. These binary Fast Operate commands are described
in Appendix D: SEL-2020/2030 & SEL-701PC Compatibility Features.
Table 4.40 SE T P Rear-Panel Se rial Port Setti ngs, Protocol = M OD
The SEL-701 Relay rear-panel serial port supports Modbus RTU protocol when
the Protocol setting equals MOD. Define the Baud Rate and Parity settings to match
the requirements of the Modbus master connected to the relay. The Modbus Slave ID
must be set with a numeric address that is different from the Slave IDs of the other
devices on the Modbus network.
NOTE: The SEL-701 Relay also includes Modbus user map
settings that you should define, store, and upload/download
using the SEL-701PC software.
Table 4.40 SET P Rear-Panel Serial Port Settings, Protocol = MOD
Setting Prompt Setting Range Setting Name = Factory Default
Protocol ASCII, MOD PROTO = MOD
Baud Rate 300–19200 SPEED = 2400
Parity O, E, N PARITY = N
Modbus Slave ID 1–247 SLAVEID = 1
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