701 Motor Protection Relay Date Code 20010719
Settings Calculation
Serial Port Settings
4.50
Serial Port Settings
The SEL-701 Relay provides settings that allow you to configure the
communication parameters for the front- and rear-panel serial ports. The front-panel
serial port only supports ASCII communications described in detail in Section 6:
ASCII Serial Port Operation. The rear-panel serial port settings include the Protocol
setting. When you set the rear-panel serial port Protocol setting equal to ASCII, the
relay supports ASCII commands at the rear-panel EIA-232 port. When you set the rear-
panel serial port Protocol setting equal to MOD, the relay supports Modbus™ RTU
protocol at the rear-panel EIA-485 port and disables the rear-panel EIA-232 port.
Table 4.39 SET P Serial Port Setti ngs, Protocol = ASC II
The SEL-701 Relay front-panel serial port supports EIA-232 communication of
ASCII text data and SEL Binary commands and responses. The rear panel is equipped
with EIA-232 and EIA-485 serial port connectors. Table 4.39 shows relay serial port
settings for the front-panel port and the rear-panel port when it is set to use ASCII
protocol. Set the Baud Rate, Data Bits, Parity, and Stop Bits settings to match the serial
port configuration of the equipment that is communicating with the serial port.
After Timeout minutes of inactivity on a serial port at Access Level 2, the port
automatically returns to Access Level 1. This security feature helps prevent
unauthorized access to the relay settings if the relay is accidentally left in Access
Level 2. If you do not want the port to time out, set Timeout equal to 0 minutes.
If you would like the relay to automatically send text messages to devices
connected to the EIA-232 serial port in response to faults and self-test warnings or
failures, set Send Auto Messages to Port setting equal to Y. If the serial port will not
Table 4.39 SET P Serial Port Settings, Protocol = ASCII
Setting Prompt
Setting Range
Setting Name =
Factory Default
Protocol,
(shown for rear port only)
ASCII, MOD PROTO = ASCII
Baud Rate 300–19200 SPEED = 2400
Data Bits 7, 8 BITS = 8
Parity O, E, N PARITY = N
Stop Bits 1, 2 STOP = 1
Timeout 0–30 min T_OUT = 15
Send Auto Messages to Port Y, N AUTO = N
Enable Hardware Handshaking Y, N RTSCTS = N
Fast Operate Enable Y, N FASTOP = N
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