Hui,
The older instruments have a very simple command structure. You don't
need the "?" to query. Typically just doing a GPIB Read command (ibread
for NI controllers) will address the counter to output and it will send
the current reading. This can cause a problem if you request data too
soon after a setup command. You'll get the previous reading.
The "ENTER S ; N$" command just reads from address "S" into the variable
"N$".
It sound like you need the command to your USB-GPIB controller to get it
to read. The counter is probably ready to send the data, the controller
just needs to initiate its read cycle.
Mike
On 6/17/2012 10:17 AM, Hui Zhang wrote:
I have a old HP5386A counter and a OEM USB-GPIB controller(no tech support), I use a serial port
debug program to send command via USB-GPIB to HP5386A, when I send "FU2"(Measure period)
or "DI"(increment display digis), the 5386 response the command and worked well, the
other control command in the HP's manual also worked well.
But I don't know how to read the measure value from 5385A, in my HP3478A mutilmeter case, I just
send a "?", it will return voltage value to software, but at 5386A, the “?” not work, I
got error message "52" on LCD panel.
I read the HP5386's manual, the demonstrates used "ENTER" command to get measure value,
but the "ENTER" is a HP-BASIC command of vintage HP-85 computer. I don't know how to send
similar command to control my counter, can someone give me some advice? Thank you!
Hui
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