ICP DAS USA 7000 user manual

2.8 How to select 7520 / 7520R

The 7520R is exactly the same as 7520 except for the isolation site. The isolation site of the 7520 is located in the RS-232 interface circuit, but the isolation site of the 7520R is located in the RS-485 interface circuit. That is to say, the power input and RS-485 interface is common ground for the 7520 but the power input and RS-232 interface is only common ground for the 7520R as follows:

RS-485 site

Power ground

RS-232 site

Applications

7520

Common ground

Isolation site Most applications.

7520R

Isolation site

Common ground

For RS-232 type PLC networking

7000 Bus Converter User Manual (version 1.2,Feb/2003, 7PH-006-10) --------------- 23