How to resolve the serial communication error in HP34970?

I want to use serial port to commnucation between pc and hb34970. In gpib mode, it is ok. But in serial mode, report error. just like this:
for setting com2:
16:11:47.359 2009-8-26 [Init_dq_Device]error:-1073807339--HP34970A Initialize.vi->Init_DQ_Device.vi->main_app.vi VISA read.visa name:ASRL2::INSTR
for setting com1:
16:13:25.921 2009-8-26 [Init_dq_Device]error:-1073807339--HP34970A Initialize.vi->Init_DQ_Device.vi->main_app.vi VISA read.visa name:ASRL1::INSTR
I don't know the meaning of -1073807339 and whether i should set:ASRL1::INSTR for com1. Anyone can help me about this problem.
Thanks very much.
attach my subvi.
Solved!
Go to Solution.
Attachments:
Init_DQ_Device.vi ‏48 KB

Hi, Dennis Knutson
very glad to see you.
For my vi, i only provide a UI for user to select GPIB or serial mode, and setting related port.
About "Also, the 34970 llb you are using should be replaced with the 8.x project library.", What do you
mean? There is a new driver for 34970,right?
I search the forum and find a old thread:Agilent 34970 Visa Timeout.
There is your answer:
I made a mistake. The initialize function already had a timeout function. I just didn't look at the VI closely enough. There is a case statement that sets either the serial port parameters or just sets the VISA timeout. If you are setting the timout right after the VISA Open, it's just getting set back to 10 seconds. Change it in the case statement and see if that works. Sorry, and I hope this works.
Do you think this is the same with my problem? Your mean to modify default 10 seconds to more longer timeout,right?
Thanks.

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I'm trying to make a simple serial port reader VI and i can't get over this:
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How to resolve the serial communication error in HP34970?