[Tutor] how to read over serial port

[shawn bright]

Thanks all,
Yeah, checked the settings, and when i have the thing talk to a
program that just prints out whatever the serial port reads, It was
looking fine.
Incorrect baudrate was my first problem, and did cause weirdness,
escpeially on the latter end of the message, but this isn't the same
problem. Just don't know how to read it.
thanks

shawn


On Sun, Nov 2, 2008 at 9:38 AM, Brian C. Lane <bcl at brianlane.com> wrote:
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> shawn bright wrote:
>> Hey there all,
>>
>> I have a gps device that talks to the computer over a serial port.
>> i am using the pyserial module and getting values in.
>
> Here are the relevant bits of a serial to tcp/ip app that I use. Most
> likely you have the wrong baudrate set. If it is an older GPS device the
> baudrate will be 4800, newer devices allow you to set it to higher
> speeds, 9600 being standard. Check the device settings to make sure that
> it doesn't have any weird parity settings too. 8 bits, No Parity, 1 stop
> bit is common.
>
>
> import sys
> import serial
>
> port = "/dev/ttyS0"
> baud = 9600
>
> ser = serial.Serial()
> ser.port = port
> ser.baudrate = baud
>
> try:
>    ser.open()
> except:
>    sys.stderr.write("Error opening serial port %s\n" % (ser.portstr) )
>    sys.exit(1)
>
> ser.setRtsCts(0)
>
> while 1:
>    # Read from serial port, blocking
>    data = ser.read(1)
>
>    # If there is more than 1 byte, read the rest
>    n = ser.inWaiting()
>    if n:
>        data = data + ser.read(n)
>
>    sys.stdout.write(data)
>
>
>
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