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-------------------------------------------------------------------------------
GPIB / HP 53131A
-------------------------------------------------------------------------------
This is a set of captures of traffic with an HP53131A counter using an
AR488 (Arduino bitbang GPIB adapter).
Logic analyzer setup
--------------------
The logic analyzer used was a generic FX2 board (at 500kHz):
Probe GPIB
----------------
0 DIO1
1 DIO2
2 DIO3
3 DIO4
4 DIO5
5 DIO6
6 DIO7
7 DIO8
8 EOI
9 DAV
10 NRFD
11 NDAC
12 IFC
13 SRQ
14 ATN
15 REN
hp53131a-idn-read.sr
--------------------
Send *idn? and receive instrument ident string.
Send 'read?', wait for acquisition and receive a measurement (10MHz frequency).
hp53131a-ton.sr
---------------
Set HP53131A to period measurement and talk-only mode and AR488 to
listen-only mode.
This setup is specifically useful for recording long logfiles of timing data
for use in ADEV measurements by "time-nuts":
http://www.ke5fx.com/timelab/readme.htm
Note: the regular NRFD/NDAC handshake occurring before and after the LON
transfer is related to the AR488 timing out non-existent transfers and may
be incorrect.
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