Scaling data from Honeywell EPKS QDB

T

Thread Starter

Tanmay

I am receiving Analog data through Modbus in QDB. However i am not able to scale the data in the range of 0-100 or anything like that. How to scale the data (which is coming in counts) in QDB?
 
Typically the Analog Inputs are serviced with 12 bit Analog to Digital converters. So a 12 bit A/D would have a full range count of 4095. The Analog Input is normally a 4-20 MilliAmp input through a 250 Ohm resistor resulting in a 1 to 5 Volt range.

The typical A/D scaling for 0-100% is something like 640 A/D counts for 4 mA = 1.0 Volt or 0% AND 3200 A/D counts for 20 mA = 5 Volts or 100% scaling.

This could also be 800 A/D Counts for 4 mA = 1.0 Volt or 0% and 4000 A/D Counts for 20 mA = 5 Volts = 100%.

Both ranges are common.
 
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