Thank you
In case someone else runs into same issue:
SLC 5/03 Chan. 0 - System had to be configured to use DH485
Regular home made pin to pin cable worked fine.
1-1
2-2
3-3
4-4
5-5
6-6
7-7
8-8
(pin 9 not connected)
Same cable used for programming and communication.
RSLinx configured to use PIC driver for plc and screen programming
Thanx again
V