i can't read data from serial port

[Paul Lau]

i want to read data from serial port using rs232,but the instrument require a command to be received prior to sending data.i use the example as "serial communication",but it does't work.i don't know how to write a command to the instrument.using Microsoft VB,the command is "COMM1.OUTPUT=CHR$(129)+CHR$(129)+CHR$(67)+CHR$(0)+CHR$(232)+CHR$(3)+CHR$(44)+CHR$(4),how to write in LabVIEW?
thanks for your reply!

[SachaE]

Hi,
to build up the data, you can convert the numbers (129, 129, 67, 0 etc), into their character equivalent, and then transmit that.

Hope this helps - are you using serial .vi's or VISA?
Really the matter is getting the string you want to output in the first place.

Here's an example in screenshot using the serial compatability vi's.

Hope this helps

S.

[Schlomer]

Hello,

I've had a similar problem and the technical support of National Instruments send me a solution called "serial line control". But than annother problem occuried an internal error, while trying to run this Vi.
If you like, I'll send it to you und you can test ist yourself und maybe you are able to handle the internal error problem.

Greetings Ruth.

[crelf]

Try to attched VI - I use it to test my serial instruments. Type the following into the "String to write" control (without the quotes): "\129\129\67\0\232\3\44\4"

cheers,
Christopher

Christopher G. Relf
Certified LabVIEW Developer

Christopher.Relf@mBox.com.au
International Voicemail & Fax: +61 2 8080 8132
Australian Voicemail & Fax: (02) 8080 8132

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[Paul Lau]

Thank you!
the example you given can be opened in version6.1,my version is 6.0,i can't use it.

[Paul Lau]

ok!you can send it to me! My E-mail:lxueqiang@yeah.net.

[Paul Lau]

thank you!
i am using VISA.

[Paul Lau]

and I type the command"\129\129\67\0\232\3\44\4",it still wrong,why?