BRUEL & KJAER 1618 - Parallel Poll; Indication of Busy

Step No. Setti ng Code
Function
Bandwidth Range
0
1/1 octave A
3
1
1/1 octave
B
2
1/3 octave
A
3
1/3 octave
B
Averaging Time
Program
Min. Time
0
Slow Random
0,1 s
1
Fast Random
0,1 s
3
Sine
0,1
s
4*)
4
Slow Random
1 s
5 Fast Random
1 s
7
Sine
1 s
8 Slow Random
lOs
9 Fast Random
10 s
Start of Record
Recorder
Step
0
No start
Not defined
5 4
Start
1/3 octave step * *
1/1 octave
step ) 5 Start
*) Codes 2 and 6 undefined
**) If 1/3 octave bandwidth is selected in step 3, the Recorder step will always be
1/3 octave, also if a 5 is received in step 5
Table 3.3. Programming codes for steps 3 through 5
3.5.4. Parallel Poll
77 041 6
The PP2 function is implemented in the Type 1617 lEe interface to facilitate sensing of
the overload indicator, and functions in the following way .
When a parallel poll is conducted by a controller (ATN and EOI both true at the same in-
stant). the Type 1617 will give the selected Parallel Poll Response if input overload has
been indicated since
the last time a parallel poll was conducted. This means, that the
controller can monitor the Input "Overload" Indicator by regularly conducting parallel
polls.
3.5.5. Indication of Busy
When the Type 1617 is in Recorder "Run" mode, it will indicate that it is busy by re-
fraining from indicating ready for data (i .e. NRFD will not become false) until the readout
is completed. This is within the standards for the digital bus .
When the Type 1617 is in the busy condition, it can be addressed and unaddressed, and
it can receive the addressed command GTL (go to local).
The busy function is sensed as follows .
When the Type 1617 is addressed, it will indicate ready for data (NRFD = false, i.e.
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