AirLink MP595 / MP595W Modem User Guide
Analog input setup
The Analog Input window (Tools > Options > MP > Input/Output) is used to configure devices on the four analog inputs. Each tab corresponds to a pin:
Analog Tab | Connector Pin |
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Input 1 | 14 |
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Input 2 | 7 |
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Input 3 | 15 |
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Input 4 | 8 |
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To configure an analog sensor or gauge, select the tab that corresponds to the pin you are using and complete the fields as follows:
•Label: Enter a description of the sensor or gauge (Measured Voltage, Vehicle Speed, etc.), up to 20 characters long.
•Raw value: Shows the analog value from the input (read‐ only). The analog input has a 10‐bit (1024‐step) resolution, so the raw value range is between 0 and 1023.
•Zero scale: Enter the minimum value for the units you are reporting (used to convert the raw analog value of zero).
•Full scale: Enter the maximum value for the units you are reporting (used to convert the raw value of 1023).
•Current value: Shows the resulting converted value using the zero and full scales entered.
•Unit: Specify the units of the input (volts, km/h, etc.), up to 20 characters long.
Example
If you are measuring temperature, and the thermometer you have connected to the I/O connector measures between ‐30 (raw value 0) and +50 (raw value 1023) degrees Celsius, then your zero scale is
The measurements are calculated for the 81‐degree range (between ‐30 and +50), which is divided into 1024 steps (0.0791 degrees per unit step). A reading of 25 degrees
(56 degrees above the minimum) would therefore show a raw value of 708 (56 degrees/0.0791 degrees per unit).
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