Gateway to convert GE - GSM protocol to MODBUS TCP/serial


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I am trying to talk to GE Fanuc 90-30 series PLC which is based on GE-GSM protocol and other side I have Siemens SPPA-T3000 DCS system and i am trying to find a gateway which converts GSM to MODBUS TCP/serial then I can read MODBUS data in T3000 DCS system.

Other scenario is to go through OPC Intermediate data manager which will be talking to 90-30 series GE-Fanuc and read/write data to Siemens T3000 system by using the Native - Is this going to work as such GE FANUC plc is built on GSM protocol?