Vidmas30 Posted May 16, 2011 Report Share Posted May 16, 2011 Good day, Having spare time, so desided to play with PLC (v350). I have a heat meter on my desk. It communicates through M-Bus protocol and there are 3 ways to choose connection type: M-Bus, RS232 and CL. I think I could connect heat meter directly to PLC (without any M-bus or CL converters) with RS232 cable. The question is how to implement data exchange between those devices? Try to implement M-Bus protocol with Visio's FB protocol? Maybe someone had such a project and can share suggestions about this. Thank you! Quote Link to comment Share on other sites More sharing options...
Vidmas30 Posted May 19, 2011 Author Report Share Posted May 19, 2011 C'mon guys.. I'm not asking for solution, just a clue to start from.. Quote Link to comment Share on other sites More sharing options...
Ofir Posted May 19, 2011 Report Share Posted May 19, 2011 Hi Vidmas30, If the device supports RS232 then you can connect it directly to the serial port of the V350. Of course tou must set the same communication parameters for both devices. (Baud rate, start bit, parity, etc..) Which protocol does Heat meter support? Does M-Bus is MODBUS? If yes then of course you can use FB MODBUS for the communication. Quote Link to comment Share on other sites More sharing options...
Vidmas30 Posted May 20, 2011 Author Report Share Posted May 20, 2011 Hi, Ofir, M-Bus (Meter-Bus) is a European standart (EN 13757-2 physical and link layer, EN 13757-3 application layer) for the remote reading of gas, heat, electricity or other meters. Quote Link to comment Share on other sites More sharing options...
Emil Posted May 21, 2011 Report Share Posted May 21, 2011 Hi Vadimas, M-Bus is not an option. What you can do with RS232. What is the protocol behind this port? Quote Link to comment Share on other sites More sharing options...
MVP 2023 Joe Tauser Posted May 23, 2011 MVP 2023 Report Share Posted May 23, 2011 Here's a link to the M-Bus documentation- M-Bus Doc I gave it a quick scan. It's pretty generic and makes several references to "manufacturer specific commands". Also, the physical layer is a two-wire network that toggles between +36V and 12-24V, so I wouldn't go plugging an RS232 cable into the M-bus port. Your best bet is to try to get some kind of communication manual that includes a description of the RS2323 protocol from the manufacturer. That should go into the detail you need. What are the details on your heat meter? Joe T. Quote Link to comment Share on other sites More sharing options...
Vidmas30 Posted May 23, 2011 Author Report Share Posted May 23, 2011 Hi, Joe, The heatmeter is made by aour local manufacturer. It comes with communication module M-bus/RS232/CL one of which is selected by jumper settings. So if I select RS232, then I can connect it directly to PLC or PC. Today I asked them what protocol goes under RS232 port (as Emil wrote). I'll write when get reply. Thank you! Quote Link to comment Share on other sites More sharing options...
Vidmas30 Posted May 23, 2011 Author Report Share Posted May 23, 2011 Hello again, Just received a reply from manufacturer - under RS232 port is the same M-bus protocol (EN1434). Quote Link to comment Share on other sites More sharing options...
External Moderators Nacho Posted April 30, 2013 External Moderators Report Share Posted April 30, 2013 After two years I wonder if anybody get to develope the M-BUS protocol with the FB PROTOCOL of Unitronics. I have some projects where the M-BUS/RS-232 converter is cheap but the M-BUS/modbus is very expensive. Quote Link to comment Share on other sites More sharing options...
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