Iec 62056-21
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A quick Google search turns up a "reference":http://www.qtforum.org/article/31180/qextserialport-checking-that-data-has-been-sent-for-rs485-comms.html of somebody using QextSerialPort for a RS-485 device. So, that should work, I guess. That, of course, does not implement iec 62056-21 on top of that yet. Does that get you started? Note that I don't have personal experience with any of this :-)
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Thanks Andre,
I already know QextSerialPort and I have no problem in communicating via rs-485. My problem is to know iec 62056-21 .
Reading some manuals it seems that iec 62056-21 is a standard protocol but I can't find some documentation about.
I only found "this":http://www.satec-global.com/UserFiles/File/SATEC/files/Manuals/EM920/EM920 IEC 62056-21.pdf but it's for a specific device and I actually can't try that protocol for my device.