Details
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Bug
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Resolution: Invalid
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P2: Important
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None
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5.14.2
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None
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Windows 7 x64 Qt 5.14.2 msvc
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Linux/X11,
Windows
Description
QSerialPort has strange behaviour with ICP DAS I-7561.
For example i compare raw com port (ICP DAS I-7520) with how it works through virtual com port
ICP DAS I-7561
Sent 8 bytes: "01" "04" "00" "01" "00" "1e" "21" "c2" Received 12 bytes: "01" "10" "02" "a2" "00" "84" "00" "00" "a0" "00" "43" "00" Received 12 bytes: "0e" "00" "28" "04" "00" "1e" "24" "54" "48" "c2" "39" "26" Received 15 bytes: "d3" "02" "11" "19" "2a" "26" "20" "54" "00" "50" "30" "50" "24" "62" "95" Received 6 bytes: "20" "56" "00" "00" "b5" "f1"
ICP DAS I-7520
Sent 8 bytes: "01" "04" "00" "01" "00" "1e" "21" "c2" Received 32 bytes: "01" "04" "3c" "00" "a2" "00" "00" "00" "84" "00" "00" "00" "00" "02" "01" "00" "0d" "01" "00" "00" "0e" "00" "00" "08" "19" "00" "00" "00" "1e" "00" "24" "51" Received 33 bytes: "0d" "32" "38" "39" "33" "36" "37" "60" "04" "19" "53" "90" "02" "20" "51" "00" "00" "04" "01" "30" "04" "19" "22" "6c" "e5" "20" "59" "00" "00" "00" "00" "ab" "15"
Here is how i receive
QByteArray ba; QDebug debug = qDebug(); while (Port->bytesAvailable()) ba += Port->readAll(); debug << "Received" << ba.size() << "bytes:"; for (const quint8 &byte : ba) { QString number = QString::number(byte, 16); if (number.size() == 1) number.prepend('0'); debug << number; }
It looks strange because i receive not the same data but if try to sniff this between device and pc it looks the same. So i think it depends on QSerialPort.
Anyway i tried the same with libmodbus as backend and i didnt use QSerialPort for communication. This works.