User's Manual

Radio/Serial Telemetry Module User Manual
Page 28 © March 2000
calculating the appropriate sensitivity required for a given application:
Instantaneous change of 2 x sensitivity on input → 3 second output response
Instantaneous change of 10 x sensitivity on input → 5 second output response
The analogue inputs have 15 bit resolution and 0.016mA accuracy.
An example of an analogue input and how the output follows it is shown below:
Pulse input change of state
Pulse input counts do not use “change-of-state” transmissions. Instead, accumulated pulse input
counts are transmitted at set intervals. The default period is 1 minute and is configurable. Note that
the pulse outputs are re-created from the accumulated pulse count. If a transmission is missed, the
pulse output will still be re-created when the next accumulated value is transmitted. This ensures that
no pulses are lost due to communications failures.
The following diagram shows how pulse inputs are re-created as pulse outputs. For pulse outputs,
the 905 module keeps two counters in memory - the pulse input count received from the remote
905 module, and the count of output pulses. When the 905 receives an update of the input pulse
count, it will output pulses until the output pulse count is the same as the input pulse count. The