Communications, 1 modbus communications, 1 rs485 wiring for modbus – GE Industrial Solutions EPM1500 Single Point Submetering System User Manual
Page 33: Modbus communications -1, Rs485 w, Iring, Odbus, Ge energy industrial solutions
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EPM 1500 SUB-METER– INSTRUCTION MANUAL
4–1
EPM 1
500 Single Point
Submetering System
Chapter 4: Communications
GE Energy
Industrial Solutions
Communications
4.1
Modbus Communications
4.1.1
RS485 Wiring for Modbus
The wiring for Modbus communications for two-wire and four-wire RS485 is indicated
below.
For two-wire RS-485:
For four-wire RS-485:
FIGURE 4–1: RS-485 Serial Connections
Color
Function
DB-9 Pinout
Yellow
RX (+)
2
Black
TX (–)
8
Color
Function
DB-9 Pinout
Yellow (A)
RX (+)
2
Black (B)
RX (–)
3
Green (Y)
TX (+)
7
Red (Z)
TX (–)
8
709725A1.CDR
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