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Connecting Sensors and Actuators to Input/Outputs
60 AX2500/2850 Motor Controller User’s Manual Version 1.7. February 1, 2005
Thermistor are non-linear devices. Using the circuit described on Figure 31, the controller
will read the following values (represented in signed binary) according to the temperature.
To read the temperature, use the ?p command to have the controller return the A/D con-
verter’s value. The value is a signed 8-bit hexadecimal value. Use the chart data to convert
the raw reading into a temperature value.
Using the Analog Inputs to Monitor External Voltages
The analog inputs may also be used to monitor the battery level or any other DC voltage. In
this mode, the controller does not use the voltage information but merely makes it avail-
able to the host microcomputer via the RS232 port. The recommended schematic is
shown in Figure 33.
47kOhm
10kOhm
47kOhm
10kOhm
10kOhm
NTC
Thermistor
AX2500 Internal Resistors
and Converter
Input Ana 1 11
or Ana 2 10
+5V 14
Ground 5
A/D
FIGURE 31. NTC Thermistor wiring diagram
-150
-100
-50
0
50
100
-20
-10
0
10
20
30
40
50
60
70
80
90
100
110
Temperature in Degrees C
Analog Input Reading
FIGURE 32. Signed binary reading by controller vs. NTC temperature