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Re: serial.dll for serial port under IDL [message #62971]

Wed, 22 October 2008 09:10

Rick Towler
Messages: 821
Registered: August 1998

Senior Member

peter.thejll@gmail.com wrote:
> Hi, Thanks for your suggestions.
>
> On Oct 20, 8:19 pm, Rick Towler <rick.tow...@nomail.noaa.gov> wrote:
>> Are you sure the serial dlm isn't working?
>
> No.
>
>> Isolate the issue by doing a
>> loopback test. Simply short pins 2 and 3 of the DB9 connector as
>> described here:
>>
>> http://zone.ni.com/devzone/cda/tut/p/id/3450
>>
>> Then write a simple program in IDL that sends some data then reads it.
>> Once you can send data to yourself then connect up the external devices
>> and try to communicate with them.
>
> Good idea! I am not much for soldering though - is the cable you
> describe a 'null-modem cable'? I have one of those.

No soldering required. You can use a paper clip :). That null modem
cable should have female connectors at both ends so you can plug one end
into your computer then short pins 2-3 at the other end of the cable.

Use Hyperterm to test your cable as described on that same webpage I
linked above. Once you know your cable is working then you can try IDL.
The test in IDL will be as simple as this:

IDL> h=comm_open('COM1',BAUD=9600,DATA=8,MODE=3,PARITY='N',STOP=1 )
IDL> b=comm_write(h,'This is a test')
IDL> data=comm_read(h)
IDL> print, data
84 104 105 115 32 105 115 32 97 32 116 101 115 116
IDL> print, string(data)
This is a test

It looks as if the original .dll was built for IDL 5.6. I just
recompiled it for 6.4 for the test above. The issue might simply be
that you need to recompile. I know you're working with 6.3, but I'll
send you the .dll I just compiled and you can try that.

-Rick

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[Message index]

		Re: serial.dll for serial port under IDL By: Rick Towler on Wed, 22 October 2008 09:10
		Re: serial.dll for serial port under IDL By: peter.thejll on Wed, 22 October 2008 06:07
		Re: serial.dll for serial port under IDL By: peter.thejll on Wed, 22 October 2008 06:05
		Re: serial.dll for serial port under IDL By: Rick Towler on Mon, 20 October 2008 11:19
		Re: serial.dll for serial port under IDL By: Wout De Nolf on Mon, 20 October 2008 08:21
		Re: serial.dll for serial port under IDL By: Rick Towler on Fri, 24 October 2008 09:10

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