I am sending (writing) bytes to a device via my serial port. I am using the QSerialPort (http://qt-project.org/wiki/QtSerialPort) module to instantiate device IO support. When I send messages to my INSTEON modem (serial), upon reading my message the device sends back a copy of my message + 0x06 (ACK Byte) followed by a status message.
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In this slot, the settings are read from SettingsDialog and an attempt is made to open and initialize the serial port accordingly. If successful, the status bar displays a message that the opening was successful with the given configuration; otherwise, a messagebox is displayed with the appropriate error code and message. Qt Serial Port support. Contribute to qt/qtserialport development by creating an account on GitHub. Hello All, I have a program in qt which sends the serial data and read the response that the operation have been performs. If i read the response from the readready signal i get the response in nanosec but if i use serialPort-waitForReadyRead the resp. After setting the port, you can open it in read-only (r/o), write-only (w/o), or read-write (r/w) mode using the open method. Note: The serial port is always opened with exclusive access (that is, no other process or thread can access an already opened serial port). Use the close method to close the port and cancel the I/O operations. Getting Started Qserialport in QT 5.1 (Gui App) Akhmad Hendriawan. Creating Qt GUI to Control a Robot - Part 1 For the Arduino Robot Project in mkelecblog. Qt & Arduino - Reading a. After setting the port, you can open it in read-only (r/o), write-only (w/o), or read-write (r/w) mode using the open method. Note: The serial port is always opened with exclusive access (that is, no other process or thread can access an already opened serial port). Use the close method to close the port and cancel the I/O operations.
I have tested my message using DockLight (http://www.docklight.de/). I send the following message to query the state of the device:
Using Docklight, I receive the response:
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The returned message indicates exactly what I would expect, that the device is on. If off, the modem would send back 0x00 in the last byte position if the device was off. Now, my problem - I must not have my function setup properly to send and then receive the response bytes. I have tried many different examples and configurations, currently I am using the following:
Setup signal-slot connections: Ipadian gamestation free.
Function used to iterate through QList of devices. If device is desired type ('Light'), then we format the device ID to the intended QByteArray message structure. Pass message to thread for sending. (Thread modified from QSerialPort
BlockingMaster example.
SetupThread function used to set local thread variables and executes (runs) thread.
![]() ![]() Run Function - Handled sending and receiving
handleResponse function, SLOT which receives response signal
I receive the following output:
Two issues here.
What corrections should be made to the way I am receiving data from the serial port?Thank you!
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Alex HendrenAlex Hendren
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2 Answers
I believe my problems have shifted from the scope of this question. With help from Kuzulis I have implemented Write/Read functions to successfully send and read serial messages consistently. Kuzulis recommended using the Synchronous blocking communication pattern, however it was later decided that the Asynchronous Non-Blocking method would be best fit for my application.
My implementation closely follows the 'Master' example provided with the QSerialPort source files.
I use
CurrentStatus to iterate through a QList of Device objects. For each Light in the Device list, I format an 8 Byte message to query the current status of the device (ON/OFF).
In the Device class constructor, I connect the signals and slots:
After the message to send in
currentStatus has been prepared, emit writeRequest(msg); is called. This dispatches a signal that is connected to the slot writeRequest . writeRequest is used to setup and actually write the message to the serial port.
Qt Serial Port Read Bytes
After setting up the serial port, I save the current message to
msgRequest . This may have to be used to resend the message if there is an error. After serial.write() is called, I setup a timer for 400ms. Once this timer expires, I check what was read from the serial port.
handleResponse() is a slot that is called everytime QSerialPort emits the readyRead() signal. readyRead() appends any available data to the QByteArray response .
After 400ms, serialTimer (one shot Timer) will emit a
timeout() signal. serialTimer was started right after writing our requested message to the serial port. processTimeout() is where we finally check the response received from the PowerLinc Modem after sending our message. When messages are sent to the INSTEON PowerLinc Modem (PLM), the PLM echoes back the message and appends either 0x06 (Positive ACK) or 0x15 (NACK). In processTimeout() I check to make sure the last byte received is the ACK byte, if not - resend our originally requested message.
I used the Serial Port Monitor 4.0 (Eltima Software) to verify the write and read transactions on the serial port. Below, you can see the log printout for 1 sample transaction.
For 20 sends, I received the same response. Thus, I can safely say my issues with inconsistent data arrival have been resolved. Now I am struggling with multiple write requests, but I believe that is a separate question to be investigated. I appreciate everyone's support.
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Alex HendrenAlex Hendren
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Serial Port Arduino
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