[SOLVED] Python EOL marker serial.read

RonHof · 10-15-2019, 12:13 PM

I'm trying to read data from a serial port:

Code:

ser = serial.Serial(
        port='/dev/ttyUSB0',
        baudrate = 4800,
        parity = serial.PARITY_NONE,
        stopbits = serial.STOPBITS_ONE,
        bytesize = serial.EIGHTBITS,
        timeout=1)

and

Code:

    Str = ser.read(8)
    print (Str)

I expected to see xxxx.xxb'\r'
but what I seem to be getting is b'xxxx.xx\r'
It seems to be splitting the EOL marker some how. I'm asssuming that b'\r' is old fashioned carriage return and has the same effect as b'\n' [new line] I'm completely baffled. Any suggestions?

dugan · 10-15-2019, 01:12 PM

Is the line terminator being sent as '\r' or '\r\n'?

RonHof · 10-15-2019, 01:24 PM

It is '\r'

RonHof · 10-15-2019, 01:27 PM

is there an easy way to specify the EOL to be '\r'

RonHof · 10-15-2019, 01:38 PM

for example with no changes to the code, only stopping and starting the data stream, when it is working as I want the output of the print statement is

b' 0.89\r'
b' 0.89\r'
b' 0.89\r'
b' 0.89\r'

but when the output of the print statement is

b' 60\r 60\r'
b' 60\r 6'
b'0\r 60\r '
b' 60\r 60\r '
b' 60\r 60'

it doesn't work as I want

RonHof · 10-15-2019, 05:08 PM

ser.eol = serial.EOL="\r" seems to do the job