Philips 6652C - Page 42

Address se lect ion
A ll devices on an I EEE -488 bus must be assigned
a bus d evice address. The counter address is se-
lectable by the five right-most switches at the
rear panel address se lector. A ll a ddresse s ex-
ce pt 31 (= 11 111BINARY ) are allowed. At delive-
ry the selecte d address is 10 ( 01 0 10BINARY)•
Talk only
By setting the leftmost address selector ( TALK
ONLY ) in position 1t the counter will not be
add
ressab le. TALK ONLY mode is used when measu-
ring data is to be transmitted directly to a
listener without any controller invo lved. A
c
ounter (Ta lk only) can for example be directly
conne cte d to a printer ( Listen only ) for co nti-
nuous print i ng of counter data.
Talk only mode must never be used in bus co nfi-
gurations including a controller. Talk-only mode
i mplie s that the c ounter will no longer "li ste n"
to the controller. If the counter is accidental-
ly swi tc hed to Talk-only mode, the bus will be
blocked, and no other instrument will be able to
"talk" on the bus.
Fig. 5.1 Bus Interface panel.
Ti ming specifications
Max da ta output rate
Normal mode:
High speed dump mode:
Vmax• Vmin or Vpp:
With AUTO-trigge r:
With mathem at i cs:
30 ••• 50 readings/sec .
Approx.
420 readings / sec.
3 ••• 4 readings / sec.
3 •• • 4 readings /sec.
Approx. 20 ••• 25 read ./ sec.
NO TE : The highe st output rat e is obtained at
minimum measuri ng timet with MATH and AUTO
trigger disabled, no parameters changed
between re adings, free-run mode and a con-
troller that does not limit the counter
output rate.
Output time for mea suring data
Nor mal mode:
High
speed dump mode:
Response
time f or
addressing:
Response time for
trigger c omman d (GE T );
Approx 5 ms (18 b ytes)
Ap pr ox. 2 ms (24 bytes)
Approx 5 t,~ s
Normal mode: 500 ~s
High speed dump mode: 200 ~ s
NOTE: The counter must be prog rammed for trigge-
red mode and ready for mea surement.
Nominal read time for programming dat a
NOTE: "Read time" = "Bu s o cc upation time"
Single command: 0.5 ms/byte ( average )
Multiple commands;
La st c ommand in string: 0.5 ms /b y te (a ver age)
Previous commands:
Measuring modes: 2 ms/byte (
average)
Other input and
measuring
functions: 0.5 ms/byte (average),
exce pt the non-measu-
ring functions, possi-
bly u sed during system
initiation.
READ Hold-off /Me as.
time /t rigger levels:
Test 1 .. . 6:
Store P1 ••. P8 :
Load P1 ... P8:
2 ms / byte ( average )
8
ms / byte (average)
240 m s/by te (average)
20 ms/byte (ave rage )
NOTE: Always use the most time consuming command
last.
Electrical specifications
Output connector:
Output:
Ou tpu t voltage; High:
Low :
Input ; Hysteresis typ:
High:
Low:
Termination;
( Re sis tance config .:)
Capacitance:
IEEE recommended type
Amphenol 57 series
"Micro ribbon " .
E1 (op en collector).
Above 2 .5 V
Below 0.4 V at 48 rnA
0.8 v
Above 2.0 V
Below 0.6 V
3 .3 kOhm ±5%, to +5 V
6.2 kOhm ±5%, to ground
Below 100 pF
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