Sorry for my English
I have Siemens CM1241 and need to communicate with Intellisys XE 90 via Modbus RTU, period.
The problem is, from XE 90 the connector is Phoenix Contact 2-Position Screw Plug Connectors MC 1,5/ 2-ST-3,81 1803578, or in other word, only 2 contacts form P9 COM1 = L1 , L2.
How we connect it to DB9 Female in CM1241? What signal go to what Pin? How about the Ground? Do I need Resistor?
Thanks for all your supports