105U-G Wireless Gateway
User Manual
Page 61
© September 2004
Registers which are not included in any block use the “default” sensitivity which is also user-
configurable. In the above example, the default sensitivity is 1 and is the sensitivity for all
I/O registers not included in the three blocks.
Important Note.
Sensitivity values need to be selected carefully for
analogue or counting
registers as small values can result in a large number of change messages, which can overload
the radio channel. A sensitivity value of 1 in 65535 is a change of 0.0015%. If the host
device writes an analogue value to a 105G every 100msec, it will change by at least 1 bit
each time. A small sensitivity value will cause a change message to be sent every 100msec.
If there are many analogue values in the same situation, then there would be many change
messages every 100msec. Sensitivity values for analogue I/O should be set to be greater than
the normal process noise of the signal. For example, if a flow signal has a normal process
oscillation of 2.5%, then the sensitivity should be set to 3% (or a value of 2000) to avoid
change transmissions from the process oscillations.