I'm new to raspberry pi. I tried to connect PLC with raspberry pi using 1a86:7523 QinHeng Electronics HL-340 USB-Serial adapter. But it is not working. What i did is. 1 download zip file of above adapter driver for Linux 2 extract it 3 run make command 4 connect USB serial adapter to raspberry pi ( I connected pin 2 and pin 3 of serial port together) 5 run putty on raspberry and select serial and type port as ttyUSB0 and clicked open 6 then new windows was popup and when i type on keyboard there is no any letters appear. Cursor position changed for some keys is it converter problem?

Nov 3, 2016 - 1 download zip file of above adapter driver for Linux. 4 connect USB serial adapter to raspberry pi ( I connected pin 2 and pin 3 of serial port.

Or is there any method to connect PLC with raspberry pi via modbus protocol? This is a very late posting and perhaps this is not any issue anymore. However for anyone that cares. The HL-340 USB-to-RS232 adaptors I have seen (& purchased on eBay) seem to be all *defective*.

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More specifically, they do not generate the correct voltage swings on the RS232 TxD pin. I know this because I bought some and could not get them to work. I plugged in an alternative adaptor (using the PL2303 chip) and there was no problem. I then checked the RS232 data pins on an oscilloscope. The HL-340 voltages on TxD were no good. RS232 requires a -5 to +5 volt swing.

The HL-340s gave about 0 to +3v. But voltages are good from the PL2303 adaptors I have used.

I have had no problem with the PL2303 USB to Rs232 adaptors. It is possible I just had a bad batch. Szybcy i wsciekli 1 download lektor plus. The RS232 voltages are generated by a transceiver chip after the HL-340. So I am not saying every HL-340 based adaptor eve3ry produced will fail. Just the ones I have seen to date. Also - FYI - I have had no issue with the MCS7840 adaptors (USB to 4-port RS232).

They are commonly available on eBay for about US$20-$30. They work straight off on current Raspbian 'stretch'.

I presume the 2-port variant MCS7820 would also work seamlessly. The MCS7840 is an easy and cheap way to add 4,8,12. Ports to a Pi. Display posts from previous: Sort.

Code: [ 381.259373] ch341 2-5:1.0: device disconnected [ 1079.740020] usb 2-5: new full-speed USB device number 4 using ohci_hcd [ 1079.949788] usb 2-5: New USB device found, idVendor=1a86, idProduct=7523 [ 1079.949793] usb 2-5: New USB device strings: Mfr=0, Product=2, SerialNumber=0 [ 1079.949797] usb 2-5: Product: USB2.0-Ser! [ 1079.952834] ch341 2-5:1.0: ch341-uart converter detected [ 1079.988849] usb 2-5: ch341-uart converter now attached to ttyUSB0 ----------> this is the part you want to see as this is the port your be using in puTty or any other communication console with the converter disconnected use the following command 'lsusb'. Code: user@mint-host ~ $ lsusb Bus 001 Device 003: ID 058f:6366 Alcor Micro Corp. Multi Flash Reader Bus 002 Device 002: ID 062a:0208 Creative Labs Bus 002 Device 005: ID 1a86:7523 QinHeng Electronics HL-340 USB-Serial adapter -------------> new line added Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub Bus 002 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub Notice the new line added? This is your device.