Here are the examples of the python api PyQt5.QtSerialPort.QSerialPort taken from open source projects. By voting up you can indicate which examples are most useful and appropriate. The Qt Serial Port module provides the following examples for reference to help understand the API usage. Running the Examples. To run the examples from Qt Creator, open the Welcome mode and select the example from Examples. When the data is sent to the serial port, the QSerialPort class emits the bytesWritten signal. The synchronous (blocking) alternative. In headless and multithreaded applications, the wait method can be called (in this case, waitForReadyRead ) to suspend the calling thread until the. Multilingual windows linux chat qt crypto encryption serial port pycrypto pyserial pyside rs232 aes-encryption python27 serial-port acp-127 Updated May 7, 2019 Python.
., read sensors via TTL R4AVA07 7 Channel RS485 analog voltage sampler - Read 7 voltages vis RS485 PZEM-016 power sensor - Read mains voltage and current consumption vis RS485 Pelco-d PTZ control - Control pan tilt zoom via RS485 Huawei E3372 modem - Send sms via USB virtual serial port STM32 series WT Servo 16 - 16 channels servo motor.
1. Introduction¶
EIA-485, also known as TIA/EIA-485 or RS-485, is a standard defining theelectrical characteristics of drivers and receivers for use in balanceddigital multipoint systems.This standard is widely used for communications in industrial automationbecause it can be used effectively over long distances and in electricallynoisy environments.
2. Hardware-related Considerations¶
Some CPUs/UARTs (e.g., Atmel AT91 or 16C950 UART) contain a built-inhalf-duplex mode capable of automatically controlling line direction bytoggling RTS or DTR signals. That can be used to control externalhalf-duplex hardware like an RS485 transceiver or any RS232-connectedhalf-duplex devices like some modems.
For these microcontrollers, the Linux driver should be made capable ofworking in both modes, and proper ioctls (see later) should be madeavailable at user-level to allow switching from one mode to the other, andvice versa.
3. Data Structures Already Available in the Kernel¶
The Linux kernel provides the serial_rs485 structure (see [1]) to handleRS485 communications. This data structure is used to set and configure RS485parameters in the platform data and in ioctls.
The device tree can also provide RS485 boot time parameters (see [2]for bindings). The driver is in charge of filling this data structure fromthe values given by the device tree.
Any driver for devices capable of working both as RS232 and RS485 shouldimplement the rs485_config callback in the uart_port structure. Theserial_core calls rs485_config to do the device specific part in responseto TIOCSRS485 and TIOCGRS485 ioctls (see below). The rs485_config callbackreceives a pointer to struct serial_rs485.
4. Usage from user-level¶
From user-level, RS485 configuration can be get/set using the previousioctls. For instance, to set RS485 you can use the following code:
5. References¶
[1] include/uapi/linux/serial.h
[2] Documentation/devicetree/bindings/serial/rs485.txt
I've successfully read data from EKM metering by using Python as in http://forum.ekmmetering.com/viewtopic.php?f=4&t=3472 link.![Communication Communication](/uploads/1/3/4/5/134512692/444673556.jpg)
![Qt Serial Port Rs485 Qt Serial Port Rs485](/uploads/1/3/4/5/134512692/173388451.jpg)
pi@raspberrypi:~/solarD/src $ ./solar.out
Send result [17]
Read result [0]
pi@raspberrypi:~/solarD/src $ ./solar.out
Send result [17]
Read result [2] 30 30
But when I change code for canonical mode of POSIX There are not thing display because program is waiting data from serial portSend result [17]
Read result [0]
pi@raspberrypi:~/solarD/src $ ./solar.out
Send result [17]
Read result [2] 30 30
And when I dump serial port, it show me that there are something has received as below
pi@raspberrypi:~ $ tail -f /dev/ttyUSB0
00000001766100000000000000000000000000000000000000000000000000000000000000000000000000000002320000000000000000000000000000000000000000000000000000C000C000C0000000000011512080313555702000000000000000000000000000000000000000000000000000000000000!
=00000001766100000000000000000000000000000000000000000000000000000000000000000000000000000002324000000000000000000000000000000000000000000000000000C000C000C0000000000011512080313560302000000000000000000000000000000000000000000000000000000000000!
00000001766100000000000000000000000000000000000000000000000000000000000000000000000000000002320000000000000000000000000000000000000000000000000000C000C000C0000000000011512080313555702000000000000000000000000000000000000000000000000000000000000!
=00000001766100000000000000000000000000000000000000000000000000000000000000000000000000000002324000000000000000000000000000000000000000000000000000C000C000C0000000000011512080313560302000000000000000000000000000000000000000000000000000000000000!