GPIB-INTERFACE OPERATION
Introduction
The PM 6669 can be controlled by a computer (control-
ler) via the GPIB-interface option, PM 9604. All functions
that can be controlled from the front panel can also be
controlled via the bus in a similar way, except selection
of measuring functions FREQ A/A
0
, and FREQ A-A
0
, the
filter, the sensitivity controls, and the power switch. The
additional micro-processor on the interface board has
made it possible to add functions. You can obtain con-
tinuously variable Measuring-time, bus-learn, high-
speed-dump etc., but these functions are only accessi-
ble via the bus.
To select a function, you send a command to the
counter. We have chosen the text on the front panel as
commands, wherever possible, in order to make them
easy to remember. E.g. the command to select Fre-
quency-B is FREQ B and the command to select Period
A is PER A.
NOTE: The characters in a command can be in both up-
per and lower case.
What Can I Do Using the
Bus?
All the capabilities of the interface for the PM 6669 are
explained below. If you want a complete description of
all GPIB-interface functions, read the ’Fluke Instrumenta-
tion-Systems Reference-Manual’.
Summary
Description Code
Source handshake SH1
Acceptor handshake AH1
Control function CØ
Talker Function T5
Listener function L4
Service request SR1
Description Code
Remote/local function RL1
Parallel poll PPØ
Device clear function DC1
Device trigger function DT1
Bus drivers E2
Source and Acceptor Handshake SH1, AH1
SH1 and AH1 simply means that the counter can ex-
change data with other instruments or a controller, using
the bus handshake lines; DAV, NRFD, NADC.
Control Function, CØ
The counter does not function as a controller.
Talker Function, T5
The counter can send responses and the results of its
measurements to other devices or to the controller. T5
means that it has the following functions:
– Basic talker.
– Talk only mode.
– It can send out a status byte as response to a serial
poll from the controller.
– Automatic un-addressing as talker when it is addressed
as a listener.
Listener Function, L4
The counter can receive programming instructions from
the controller. L4 means the following functions:
– Basic listener.
– No listen only.
– Automatic un-addressing as listener when addressed
as a talker.
Service Request, SR1
The counter can call for attention from the controller e.g.
when a measurement is completed and a result is avail-
able.
GPIB-INTERFACE OPERATION Page: 21
PM 6669 - OPERATORS MANUAL
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