Posted 4 Mar 2017 Dear All Sorry for my English I have Siemens CM1241 (picture attach) and need to communicate with Intellisys XE 90 via Modbus RTU, period. The problem is, form 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 (picture attach). 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 Best Regards Share this post Link to post Share on other sites
Posted 17 Mar 2017 Solution on the Siemens forum: https://support.industry.siemens.com/tf/ww/en/posts/intellisys-modbus-com-port-to-db9-cm-1241/162711/?page=0&pageSize=10 Share this post Link to post Share on other sites
