Chapter Five: Remote RS-232 Operation Setup Messages
77
How To Set the Backfill Threshold Pressure Value
This value is the required difference between the new set point and the current pressure in the
system before the backfill control feature operates. Set point changes less than the backfill
threshold value do not trigger the backfill function. The entry is defined as a percent of the full
scale value for the high pressure transducer. The messages described here change and report the
threshold value.
The command [MDvalue] sets the minimum delta pressure value, where:
value is a percent of the high range pressure transducer full scale, from 0 to 100 %
The default is 5% of full scale of the high range transducer.
To report the minimum delta pressure value, enter:
RMD
The controller responds with the message [MDvalue], where:
value is a percentage of the high range pressure transducer full scale, 0 to 100%
How To Set the Valve Position Signal Output Range
The command [B value] configures the full scale voltage range for the valve position signal
(analog) output, where:
value: 0 = 5 Volts
1 = 10 Volts (initial)
To check the current range of the valve signal output, issue the request:
R 31
The controller responds with the message [B value], where:
value: 0 = 5 Volts
1 = 10 Volts
An example response, if the valve output has a full scale range of 10 Volts, is:
B 1
To change the valve signal output range to 5 Volts, enter:
B 0
How To Set the Valve Battery Back-Up Control
The 651 controller has an optional valve failsafe battery back-up. If your 651 unit has this
option, it can be configured so the valve battery back-up drives the valve to fully open or fully
closed within 30 seconds of an AC power failure. The option can also be disabled.
The command [K value] defines the direction of valve control upon power failure, where:
value: 0 = Disable option
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