RS-485 Communications Setup

 

Digital communications with the 808 Controller uses the Modbus protocol EIA485 2-wire (formerly RS485).

Cable screen should be grounded at one point only to prevent earth loops.

• Isolated 300Vac CAT II.

 

EIA485 Connections

 

Note:

The device physical interface can only support up to 31 devices for each segment.  More than 31 devices will require additional buffering.