- 18 - 
 
8) Connection of ModBus 
The IPC5000 with the optional communication provides an RS 485 communications ports 
with ModBus RTU protocol support. 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Fig. 2.7.9 RS422/485/Modbus Communications Option Connections (3-Wire shield) 
 
 
 
 
 
 
3-Wire 
Shielded 
SG 
SDB 
SDA 
RDB 
RDA 
MODBUS 
Master 
RX+/TX+ 
RX-/TX- 
SG 
To other communication IPC5000 
(Maximum 31) 
* 120 Ohm Resistor on Last Leg 
120 Ohm 
Resistor
 
Do not run these lines in 
the same conduit as AC 
power 
Use shielded   
twisted pair cables