communication problem with agilent 34401a

[Romain_H]

Hi all,

I' m using Labview 8.2 and visa 4.2.

I 've connected my agilent 34401a and it is recognized, I see it in agilent connection expert and manage to communicate with it. (query *IDN?)

But I get a problem when I want to use the control_mode vi. (remote or local).

the error is displayed just after the Visa Read function (Vi below)

I don't understand why. I use the RS 232 connection and it is correctly configured in the devices manager.

Anyone can help me ?

Thanks,

Romain

[Romain_H]

Sorry,

I've forgotten the Vi.

Now it's OK

Thanks

[unclebump]

You might not be waiting long enough for the write command to be executed in the instrument. You are doing a visa read just after the visa write but with a small time delay value. It might be better to use a property node for number of bytes in the buffer. Then do the read and wait until the proper number of bytes are available, or wait until a termination character is transmitted from the device.