Instrument Control (GPIB, Serial, VISA, IVI)

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Centronix / gpib

Dear friends!
I hope someone will help me. My problem is the next:
I have made a very simple controller Centronix / gpib without any
intellegence - only registers and multyplexes. Now i try to communicate with
one old fassioned soviet gpib voltagemeter. It supports handshaking in some
cases but dont accept data and present errors data. Quite possible that
device is not good enouugh, but i am not shure in some aspects:
- are there any limitation on signals duration in gpib? - i try to work in
manual mode.
- dose selected device keep NRFD and NDAC aftter removing ATN in case when i
am going to send Data?
Thanks in advance.
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