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Cannot make a READ? command in Ki-488 - 6487

2502, 6485, 6487 - Support
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gabrielachaves
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Joined: September 29th, 2015, 5:56 am
Country: Brazil

Cannot make a READ? command in Ki-488 - 6487

Post by gabrielachaves » September 29th, 2015, 11:10 am

Hello everyone,

I'm using a 6487 and a GPIB-to-USB cable (KUSB-488B driver) to read currents in a Windows 8 (I'm going to use Labview). I think the driver is working fine, I can see my - model on Configuration Utility software.
When I start Diagnostic Tool, I can communicate with it, using the standard address, 22. If I put an *IDN? command, it's answer is OK.

However, every reading (READ?, MEASURE?, ...) I try to do after that makes a timeout error.

I also tried
*RST
:INIT
:TRG
as I saw in another topic and it makes a -113 error, "Undefined header", but it seems that's no error in my commands.

Could anyone help me?

Thanks,
Gabriela.

Dale C
Keithley Applications
Keithley Applications
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Re: Cannot make a READ? command in Ki-488 - 6487

Post by Dale C » September 29th, 2015, 12:26 pm

On default the ARM COUNT is set to INF.
Try sending the following command.
:ARM:COUNT 1
THen send :READ?
THat should do it.

gabrielachaves
Posts: 2
Joined: September 29th, 2015, 5:56 am
Country: Brazil

Re: Cannot make a READ? command in Ki-488 - 6487

Post by gabrielachaves » September 29th, 2015, 1:39 pm

Dale,

it's working, thanks!

Could you please answer one more question?
Whats the difference between Arm Count and Trigger Count?

Thanks in advance,
Gabriela.

Andrea C
Keithley Applications
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Joined: October 15th, 2010, 10:35 am
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Re: Cannot make a READ? command in Ki-488 - 6487

Post by Andrea C » September 30th, 2015, 3:50 am

Gabriela,

Check out figure 7-2 in the 6487 Reference Manual. It shows the remote trigger model flow chart.
You can see the effect of arm count and trigger count in that figure.

Andrea

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