When setting up a SR90 to retransmit values to MicroScan, the value recorded goes up and down, when it is known the the PV on the SR90 is steady.

Solution:

Check the RTX Settings in the SR90 have been set correctly to PV.

Set on screen SR90 1-31, possible settings are PV,SV,out1,out2.

In this instance the RTX was set to Out 1, thus was going up and down as the controller was controlling the process.