User manual

905K Radio Telemetry Module User Manual
 ELPRO Technologies Pty Ltd 2010 Page 40
4.7 Pulse Inputs
Each 905K has two pulse inputs. Each pulse input has 2 x 16 bit counters and a calculated pulse
rate value. The 2 x 16 bit counters are a base counter which increments on each pulse, and an
“HI” counter which increments each time the base counter overflows. Either or both counters
can be transmitted, although each is transmitted individually.
There are several configurable parameters for pulse inputs. The paralysis value can be adjusted
from the Unit Details selection, as per Digital Inputs.
The pulse inputs also have a
Sensitivity value. The pulse input
sensitivity is the number of pulse
increments since the last
transmission to trigger another
transmission. For example, if the
pulse count at the last transmission
for a pulse input was 1000, and
the sensitivity value is 10, then
another transmission will occur when the pulse count reaches 1010 (provided there has not been
an update transmission during this period). The sensitivity values can be between 1 and 32000.
If either pulse input has an input rate of more than 10Hz, then the Fast Pulse Input option should
be selected from the Pulsed Inputs selection. This is selected at “Pulse Input 1 Count” even if
you are using PI2. That is, if either PI1 or PI2 is faster than 10Hz, select “Enable Fast Pulse
Inputs” for PI1. Selecting Fast PI will increase the power consumption of the 905K and is not
suitable for battery supplies.
PI2 has a user-configurable divider for scaling its pulse counters. PI1 does not have a divider.
The PI2 divider can be an integer from 1 – 255. If the divider is set to X, then the base counter
will increment by 1 for every X input pulses.