Philips 6652C - High Speed Dump Mode

It is good practice to enable service request
before performing a test. The completion of the
test is then indicated by an active SRQ line.
The alternative (if SQO is programmed) would be
successive ,serial-polls until status byte 7 is
recognized.
When test No. 6 is executed, a sequence of tests
1 ••• S' is performed. When "SQ1" is programmed,
the SRQ line will be active after the last test
(No. 5).
The measuring cycle is summarised in table 5.7.
Status message
Binary Decimal
Testing
00010111 23 busy
Ready without service req
00000111 7
Ready with service req.
01000111 71
Error il), - test
1 , with SRQ 01100001 97 ready
"
test
2,
II
01100010 98
"
test
3,
n
01100011 99
II
test 4,
/ '
n
01100100
100
Table 5.7
Totalize A manual gating
The Totalize A manual gating mode, has a diffe-
rent measuring cycle. Unlike other measur,ing
nodes, the counter has no Idea if or when the
measurement is terminated and when the final re-
sult is ready. The only way to terminate a Tota-
lize A manual measurement is to select another
measuring function. Closing the manual gate
will not terminate the measurement. The gate
might, later, be opened for the totalizing to
continue.
The contents of the counting registers are sen-
sed approximately 50 times/second during the to-
talizing process. It is thus possible to follow
the totalizing "continuously" (SO readings/sec.)
via the bus.
The measuring cycle is illustrated in fig. 5.8.
There are in principal only two phases: the re-
gisters and output of the result. These phases
may have different status values, depending on
whether the gate is open or closed.
fig. 5.8 Measuring cycle: TOTALIZE A.
Status message
Binary
Decimal
Gate open
Sensing
00011110
30
busy
Output
00001110
14
f ready
Output with service
req. 01001110
78
Output with
limit alarm 01101110 110
Gate closed
Sensing
00010110
22 busy
Output
00000110 6
}ready
Output with
service req.
01000110
70
Table 5.8 Summarizes the measuring cycle.
High-speed dump mode
The measuring cycle for the high speed dump
output is shown in fig. 5.9. The status byte has
the binary value 00001100 (decimal 12) during
dump mode.
fig. 5,9 Measuring cycle: HIGH SPEED DUMP MODE.
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