9D1-031-D34-A HART to MODBUS RTU Manual (2)
Revision A
HART TO MODBUS RTU MANUAL
2.3
Communication Port Details
2.3.1
HART connection
Configuration with 4-20mA connected to PLC/DCS
Configuration with 4-20mA directly connected to Gateway
2.3.2
Connection to PLC/DCS (digital)
RS-422/485 wiring: Modbus RTU Slave MJ2 to User System
RS-422/485 Connection
PLC1/COM1 GATEWAY
Signal Direction
USER CONNECTOR
Pin No.
Name
Pin No.
Name
1
TX+
pn
RX+
8
TX-
pn
RX-
4
RX+
pn
TX+
9
RX-
pn
TX-
5
GND*
pn
GND*
User can convert RS485 4 wire + Signal Ground system to a 2 Wire + Signal Ground system by shorting
following signals in the communication cable:
