Digital Overcurrent & Ground Overvoltage & Selective Ground Relay (GDR-AEF01) User's Manual
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Kyongbo Electronics Co., Ltd.
Protocol
Communication
Method
● RS-232/485
Supported
Protocol
● MODBUS
Communication
Protocol
(RS-485C)
Communication
Distance
● 1.2km
Communication
Cable
● General Purpose 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
● Upper Level SCADA Communication
● Contact No. : 13(+), 15(-)
【
Table 4.2
】
Communication Method
4.2.1
RS-232C Communication
【
Figure 4.1
】
RS-232C Circuit Diagram
【
Figure 4.2
】
RS-232C Connection
Ÿ
The RS-232C communication cable supplied with this product uses a cross
cable which has No. 2 and No. 3 pins crossed ash shown in
【
Figure 4.1
】
,
so using ordinary direct cable will not enable the communication.
Ÿ
If there is no RS-232C port in the PC, and uses USB port, only with
USB to 232 cable cannot make connection, so plesae use USB to 232