E3649a

[mmurray]

Hi 

I am using RS-232 to talk to my E3649A power supply, I have downloaded the drivers and can set voltages and turn on and off the power, but I cannot read voltage or current, does anyone know why the serial port is timing out?

Matt

[Curt_C]

Hi,

Have you tried using NI-SPY to capture the calls?

Curt

[Dennis_Knutson]

The Initialize function works with asking for the id but the Measure function returns a timeout error?

[mmurray]

When it is set up as GPIB the Measure VI is fine. It seems to be only a problem with RS232.

[Dennis_Knutson]

Please answer my question.

[Curt_C]

Hi,

Try using the Visa Test Panel for 'ASRL#:INSTR' in NI-MAX

send these commands

INST:SEL OUT 1\n

and

MEAS:VOLT?\n

and see what happens

Curt

[Curt_C]

correction

command 1

INST:SEL OUT 1\n

Curt

[mmurray]

Yes, the initialize functions returns the information without timing out, however, all of the other queries time out. If I look at VISA attributes in MAX I see...Is Port Connected... VI_ATTR_ASRL_CONNECTED...ERROR- Visa (0xBFFF001D) The specified resource is not defined or supported by the reference resource.

[Dennis_Knutson]

That attribute is only supported by serial adapters from NI so ignore that.

I don't understand how one query can work but not another. Have you tried the VISA test panel as previously suggested or a terminal emulation program such as hyperterminal, putty, etc? The suggestion to run NI-Spy/IO Trace is also a good idea.

[mmurray]

I have not tried another terminal emulator. This weekend I will try hyperterminal. I will also try without a USB to Serial adaptor.

I am not that familiar with NI Spy, but will also see what it can tell me about this failure.