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Data Acquisition
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Hello,
As you know, there's one type of communication for modbus: Modbus RTU based on TCP/IP.It packages complete Modbus RTU frame into TCP/IP frame. it's not same as modbus TCP.
If PcVue can support this?
Mark
Posted : 06/03/2015 2:17 pm
Not supported 🙁
Posted : 06/03/2015 2:29 pm
Hello! Uuuhhh I'm writing a lot in this period here! :woohoo:
I had the same trouble with a customer in telecontrol market. Nicolas is right, is not natively supported by PcVue.
This approach (MODBUS-RTU encapsulated in a TCP socket) is common when a customer want to connect a remote serial PLC using a cheap Serial-To-Ethernet converter, instead to use a ModbusRTU->ModbusIP gateway which is more expensive.
Infact in the first case the serial server simply convert the messaging in Ethernet packets, in the second case the gateway is "smart", making a true protocol conversion.
In my experience nothing is magic, so the "simply" conversion Serial to Ethernet can cause problems, especially due to synchronization (TCP-IP is packet based, serials data exchange not).
As far as I know many customer solved by using a software gateway that re-create virtual COM port starting from a TCP socket. If your customer is really using remote serial server (i.e. Moxa) I'm pretty sure you can find an utility that re-create COM5...6...10...20...100... on the destination PC (in your case the PcVue machine). Then you can map your Modbus-RTU node to the correspondant virtual COM port.
Hope it helps and... have a nice weekend!
Posted : 06/03/2015 4:10 pm