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7000 Bus Converter User Manual (version 1.2,Feb/2003, 7PH-006-10) --------------- 23
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:
7520 7520R
RS-485 site Isolation site
Power ground
Common ground
RS-232 site Isolation site
Common ground
Applications Most applications. For RS-232 type PLC networking