9D1-031-D34-A HART to MODBUS RTU Manual (2)
Revision A
HART TO MODBUS RTU MANUAL
RS-232 wiring: Modbus RTU Slave MJ2 to User System
RS-232 Connection
PLC1/COM1 GATEWAY
Signal Direction
USER CONNECTOR
Pin No.
Name
Pin No.
Name
2
TXD
pn
RX
3
RXD
pn
TX
5
GND*
pn
GND*
CMOS wiring: Modbus RTU Slave MJ2 to User System
CMOS Connection
PLC1/COM1 GATEWAY
Signal Direction
USER CONNECTOR
Pin No.
Name
Pin No.
Name
7
TXD
pn
RX
3
RXD
pn
TX
5
GND*
pn
GND*
* Note: If user has attached shield to Earth on Device end, leave the shield open on Gateway end. If user
has connected shield to Signal Ground on Device end, connect shield to Signal Ground on Gateway end.
A and B are polarity insensitive. Twisted pair cable should be used for Rs485 Network.
2.4
LED Status
There are 3 LEDs for status indication.