Digital OverVoltage Relay (GDR-C01) User's Manual V1.00
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Kyongbo Electronics Co., Ltd.
4.
Subsidiary Function
4.1 Metering
This relay has the metering function of the voltage.
Category
Characteristic
Va Phase Voltage
● Measure the effective value of the voltage
● 1st voltage of the relay input voltage converted by CT ratio
● Metering Range : 0 ~ 250V (When PT Ratio is 1:1)
【
Table 4.1
】
Metering Display
Except, the voltage over the metering range is displayed as FULL.
4.2 Communication
This relay offers the general purpose RS-232C / RS-485C communication method,
and the maximum speed of 19200 bps data transmission is possible. There are 1
RS-232C port in the front and 1 RS-485C port in the back of the relay. The
RS-232C communication port in the front of the relay is connected to PC and used
for changing the setting values, viewing the measurement, verifying Fault information,
display the status, and Remote Reset, and the RS-485C communication port in the
back is used for remote SCADA communication.
Protocol
Communication Method
● RS-232/485
Supported Protocol
● MODBUS
Communication
Protocol
(RS-485C)
Communication Distance
● 1.2km
Communication Cable
● General RS-485C Two-Pair cable
Communication Speed
● 300 ~19200 bps
Communication Method
● Half-Duplex
Maximum In/Out Voltage
● -7V ~ +12V
Communication
Port
Front Display Panel
● RS232 Port 1
● 19200 BPS,
MODBUS Protocol
Back
● RS485 Port 1
● 300 ~ 19200 BPS,
MODBUS Protocol
● SCADA Communication
● Contact No. : 13(+), 15(-)
【
Table 4.2
】
Communication Method
