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Version 1.73 Copyright © 1997 Link Communications Inc. 1/18/97
102: Set Conversion Ratio For Analog Input
This command allows you to select what scale the analog inputs are read on. This allows you
to use the analog inputs to read temperature on a scale from hundreds of degrees below zero to
hundreds above, battery voltage on a scale from 0 to 25 volts or wind direction from 0 to 360
degrees. Anything that can generate an analog voltage can be read on a scale appropriate to the
measurement. Unfortunately, this flexibility brings with it a little complexity. To make it easy,
we provide a chart of the common conversions you might use. If you want to use a conversion
that is not listed, read the explanations after the chart and study the examples on the chart.
Once you see the pattern, the calculations are not difficult.
Command Parameters Description Resolution
<102> x n wwww m zzzz General conversion form ....
<102> 4 0 0000 0 0250 Internal Battery Voltage 0.1 volts, enter "101 4 1"
<102> x 1 0460 0 0440 Fahrenheit temperature 1 degree, enter "101 x 0"
<102> x 1 0273 0 0227 Celsius temperature 1 degree, enter "101 x 0"
<102> x 0 0000 0 0005 0..5 volts 1 volt, enter "101 x 0"
<102> x 0 0000 0 0050 0..5 volts 0.1 volt, enter "101 x 1"
<102> x 0 0000 0 0500 0..5 volts 0.01 volt, enter "101 x 2"
<102> x 0 0000 0 0025 0..25 volts 1 volt, enter "101 x 0"
<102> x 0 0000 0 0250 0..25 volts 0.1 volt, enter "101 x 1"
<102> x 0 0000 0 2500 0..25 volts 0.01 volt, enter "101 x 2"
<102> x 0 0000 0 0100 0 to 100% 1 percent, enter "101 x 0"
<102> x 0 0000 0 0360 0 to 360 degrees 1 degree, enter "101 x 0"
Notes:
- Please note that regardless of the conversion used, the voltage entering the analog inputs must
be between 0 and 5 volts.
- For more information about hooking up a LM335Z temperature sensor, see Appendix H.
Parameters:
- 102 is the default command name.
- x is the analog input line number (1..5)
- n is 1 for negative, 0 for positive for the following number
- wwww is the reading with a 0 volt input with leading 0s if necessary
- m is 1 for negative, 0 for positive for the following number
- zzzz is the reading with a 5 volt input to the processor with leading 0s if necessary.
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