Schweitzer Engineering Laboratories SEL-701-1, Instruction Manual

Page: 111 / 452

Date Code 20011009
SEL-701-1 Monitor
Settings Calculation
Serial Port Settings
3.53
The monitor 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-701-1 Monitor 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 monitor is connected to
an SEL Communications Processor. These binary Fast Operate commands are
described in
Appendix D: SEL-2020/SEL-2030 Compatibility Features .
The SEL-701-1 Monitor 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 monitor. 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.
Table 3.41 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