Reading from USB serial port under Cygwin

command linecygwin;serial portusb

I am actually using Cygwin, but it is my understanding that it responds to Unix commands so hopefully I am in the correct place.

I have an Arduino hooked up via USB to my LapTop for data reading.

I want to be able to simultaneously be able to output the serial port data to the shell for my viewing and also save all that data as a text file.

Is there a command I can use to do this?

Best Answer

The command tee duplicates its input onto several output streams.

Cygwin presents serial ports as /dev/ttyS0, /dev/ttyS1, … corresponding to Windows's COM1, COM2, … (there's an offset of 1).

Figure out which serial port number Windows assigns to your serial device. Say the device is COM4:

tee </dev/ttyS3 serial-log.txt

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Linux – reading from serial from linux command line

Same as with output. Example:

cat /dev/ttyS0

Or:

cat < /dev/ttyS0

The first example is an app that opens the serial port and relays what it reads from it to its stdout (your console). The second is the shell directing the serial port traffic to any app that you like; this particular app then just relays its stdin to its stdout.

To get better visibility into the traffic, you may prefer a hex dump:

od -x < /dev/ttyS0

Testing QinHeng Electronics HL-340 USB-Serial adapter

Is the adapter loading the right kernel module? I've heard that your device may be CH341 compatible:

sudo modprobe ch341

Best Answer

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Linux – reading from serial from linux command line

Testing QinHeng Electronics HL-340 USB-Serial adapter

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