Philips 6652C - Interface Specifications

INTERFACE SPECIFICATIONS
For a complete description of the IEEE-488 in-
terface funct.ions, see the Philips instrumenta-
tion systems reference manual. As supplied with
'
either a PM 6652 or PM 6654, the PM 9696 has bus
capabilities according to table 5,2,
Description
Source handshake
Acceptor handshake
Control function
Talker function
Listener function
Service request
Remote/local function
Parallel poll
Code Capability
SH1 Complete
AH1 Complete
C~ No controller
T5 Complete
L4 Complete (except
listen only)
SR1 Complete
RL1 Complete
PP0 No parallel poll
Device clear function DC1 Complete
Device trig. function DT1 Complete
Table 5.2 Summary of interface functions.
Interface characteristics
Under the standards established for interface
function subsets in IEC 625, many of the func-
tions can have only two states: present or ab-
sent. A function which is present is indicated
by a "one", and one which is absent by a "zero"
after the function code, Examples are SH, AH,
SR, DT, (see table 5.2).
other interface functions can be implemented in
different ways. For instance, there are 9 diffe-
rent "talker" functions (lO ••• TB), and S "liste-
ner" (LO ••• L4) possible. In the PM 9696, the
talker function TS and listener function L4 are
included,
The talker function T5:
Basic talker.
Talk only mode.
Serial poll.
Automatic unadressing when addressed as
listener.
The listener function L4 :
Basic
listener.
Automatic unadressing when addressed as
a talker.
Source and Acceptor Handshake (SH1, AH1)
SH1 and AH1 simply means that the counters are
capable of exchanging data with other
instruments or a controller, using the bus
handshake 1i nes ( DAV , NRFD , NDAC) •
Talker Function (15)
The counter cen send its measuring results to
other devices or to a controller ("it talks").
T5 also means that the counter can send out a
status byte as a response to a serial poll,
initiated by the controller.
Listener Function (L4)
The counter is capable of rece1v1ng programming
instruct ions from a controller ("it listens").
Service Request (SR1)
The counter can interrupt the controller, e.g.
after completion of each measurement, to advise
that it has data to send.
Remote/local
(RL1)
The counter can be controlled manually (locally)
or remotely, via the bus.
Device clear (DC1)
The counter can be reset remotely and forced to
default settings.
Device Trigger (DT1)
Enables remote starting (triggering) of a new
measurement via the bus.
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