-------------------------------------------------------------------------------
-GPIB
+GPIB / HP 1631D
-------------------------------------------------------------------------------
This is an example capture of some GPIB traffic on an HP 1631D LA/scope.
--- /dev/null
+-------------------------------------------------------------------------------
+GPIB / HP 33120A
+-------------------------------------------------------------------------------
+
+This is an example capture of a *idn query to an HP33120A AWG 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
+
+
+Data
+----
+
+Send *idn? and receive instrument ident string.
--- /dev/null
+-------------------------------------------------------------------------------
+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.
--- /dev/null
+-------------------------------------------------------------------------------
+GPIB / Keithley 2015
+-------------------------------------------------------------------------------
+
+This is an example capture of a *idn query to a Keithley 2015 DMM 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
+
+
+Data
+----
+
+Send *idn? and receive instrument ident string.