Philips 6652C - Page 58

Miscellaneous
Programming errors will result in a mandatory
SRQ and will also block any further operation of
the counter. The counter wi 11 ignore the faulty
programming codes (e.g. "F53") or the faulty
I
range (e.g. "AL-300"). There are 4 ways to re-
lease the counter:
a) Local mode.
b) Read the status byte (serial Poll).
c) Device clear.
d) Program data out ("P0" or "P1 ").
After release of the counter the measuring cycle
starts from the beginning with a new preparation
phase. The status byte for programming errors is
binary 01101111, decimal 111.
The counter can be busy performing tasks that
are not found in the previous examples. This
"undefined
busy" status is binary 00010101,
decimal 21. This status is, for example, tempo-
rarily present during the power up phase.
The SRQ-line in the IEEE-488 interface as well
as bit No. 7 in the status byte are set to 1 in
the following situations, at output (when re-
quested by "SQ1") , when limits are exceeded
(when requested by "SQ2" or "SQ3") or upon
errors.
The SRQ-line and status bit No. 7 are reset in
the following cases:
- Directly after a serial poll.
- When the counter receives new programming
data.
- When the counter sends measuring data on the
bus.
That means that in case of a SRQ, the controller
·should first of all make a serial poll to exa-
mine the status byte before any other bus ac-
tions are performed with the counter. Otherwise
the information of a possible counter-SRQ is
lost.
It is possible to find temporary status byte
values that are not shown in table 5. 9. If an
alarm condition occurs (status 96, 97
1
98, 99,
100, 110, 111 ) and the SRQ-bit is reset after a
serial poll, an additional serial poll will re-
sult in status byte showing alarm without SRQ
(status 32, 33, 34, JS, 36, 46, 47).
Summary
All possible status bytes, in ascending order,
are summarized in table 5,9,
Status value
0 00000000
6 00000110
7 00000111
8 00001000
12 00001100
14 00001110
16 00010000
17 00010001
18 00010010
19 00010011
20 00010100
21 00010101
22 00010110
23 00010111
24 00011000
26 00011010
Status message
Normal output.
Output T.M., gate closed
Test ready
Output H.O.
1
M. T
09
T.L,
Dump mode
Output T.M., gate open
Computing
Preparation ("TE1")
Preparation ("TE0")
Waiting for trigger
Waiting for input sync.to start
Busy, undefined task
Sensing T .M., gate closed
Performing Test
Waiting for
input sync.to stop
Reading H.O., M.T., T.L.
28 00011100 Measuring
30 00011110
64 01000000
70 01000110
71 01000111
72 01001000
78 01001110
96 01100000
97 01100001
98 01100010
99 01100011
100 01100100
110 01101110
111 011 01111
H.O. = Hold-Off
Sensing
T.M., gate open
Normal output with SRQ
Output T.M. with SRQ,gate closed
Test ready with SRQ
Output H.O., M.T., T.L. with SRQ
Output T.M. with SRQ, gate open
Ready with limit alarm
Error in test No. 1
Error in test No. 2
Error in test No. 3
Error in test No. 4
Limit alarm, T.M., gate open
Programming error
M.T. =Measuring time
T.l. = Trigger levels
T.M. = Tot. A Manual gating.
Table 5.9
Artisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com