16
Figure 4-5
Timing for Two Circulations
4.2.2 Asynchronous (Internal Interrogating) Mode
In asynchronous operation the transducer interrogates itself. The DPM uses a fixed interrogation
frequency. Switches SW1 and SW2, located on the DPM board, are set to the hexadecimal value
of the desired number of recirculations. Permissible settings are 01 to 7F corresponding to 1 to
127 recirculations.
The update rate in this mode is determined by the following formula:
Refer to the Addendum in the back of this manual for DPM programming procedures.
4.2.3 Operation During Loss of Signal
It is the responsibility of the Digital Counter Card to detect a loss of signal in the system (such as
when the magnet is removed from the rod). The DPM supports this mode by supporting a restart
mode if the Digital Counter Card negates its interrogation cycle before the end of a data acquisi-
tion cycle.
U = (N + 1) * (SW3 + 1) * .2 ms
Where:
U = Update rate in ms
N = # of recirculations selected on SW1 and SW2 (1 to 127)
SW3 = Setting of SW3 (0 to 15)
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