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 Reading data from usb/serial		  New Topic  Reply to Topic
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mbowser

USA
1 Posts
Posted - 02/12/2013 :  05:34:28  Show Profile  Reply with Quote
I am interested in reading data in from the GMC300 into my own application for post processing, but I am having a little trouble reading anything from the port. I wrote a simple python script that should access the data, but I'm not seeing any data when I run it. Right now it is running on a Debian Linux dist. (Raspberry Pi), but I could easily try it on a windows system using C# or similar language.

Has anyone done this or could point me in the correct direction?



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Reply #1

ZLM

1261 Posts
Posted - 02/15/2013 :  20:39:24  Show Profile  Reply with Quote
The baud rate shoudl be 38400
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Reply #2

jd

4 Posts
Posted - 03/05/2013 :  19:16:15  Show Profile  Reply with Quote
quote:
Originally posted by mbowser


Has anyone done this or could point me in the correct direction?


Here the USB serial device of the GMC-300 appears as /dev/ttyUSB0 and communication uses the following serial settings:
57600 baud
8 data bits
No parity
1 stop bit
No hardware control lines

Except for the baud rate these settings may already match the default settings of the python serial class. Therefore, you'd only need to specify the device and the baud rate. For example:

  import serial
  s = serial.Serial( "/dev/ttyUSB0", 57600 )
  s.write("<GETVER>>")
  version = s.read(14)
  print version


It also helps to have read/write access to "/dev/ttyUSB0":

$ ls -l /dev/ttyUSB0
crw-rw---- 1 root dialout 188, 0 Mar  5 20:57 /dev/ttyUSB0
$ groups
user dialout cdrom audio video
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Reply #3

ZLM

1261 Posts
Posted - 03/05/2013 :  19:23:56  Show Profile  Reply with Quote
baud rate should be 38400.
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Reply #4

phgphd

USA
12 Posts
Posted - 03/05/2013 :  19:53:35  Show Profile  Reply with Quote
ZLM, why are you insisting on 38400 baud. My software uses 57600 and works at that baudrate.
mbowser, why don't you look at my C++/Ubuntu Linux software at h**p://sourceforge.net/p/gqgmc/wiki/Home/. You should be able to read the C++ fairly easily and convert to Python. The ICD documentation and documentation embedded in the code is comprehensive.
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Reply #5

ZLM

1261 Posts
Posted - 03/05/2013 :  22:02:26  Show Profile  Reply with Quote
sorry. My mistake, it shuld be 57600 baud. I am keeping mixed with my another project. :-)
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