MoTeC ADL3 EDL3 - Manual (Page 13)

MoTeC Installation
9
These inputs can also be used to measure two wire variable resistance
sensors if an external pull-up resistor is connected from the input to the 5
V sensor supply.
Additionally, on/off switch signals may be connected, which may also
require an external pull-up resistor.
Analogue Temp Inputs
Analogue Temperature inputs are identical to Analogue Voltage inputs,
except that they contain a 1000 ohm resistor which is connected internally
from the input pin to the 5 V sensor supply. This allows the Analogue
Temperature inputs to be used with two wire variable resistance sensors
such as:
o Two wire thermistor temperature sensors
o Two wire variable resistance pressure sensors
Some voltage output sensors can also be used if they can drive the 1000
ohm resistor without causing an error in their reading (e.g. MoTeC
Thermocouple Amplifier).
Additionally, on/off switch signals may be connected.
Switch Inputs
Switch inputs are generally used for the external switches required to
operate the display. These inputs have a 4700 ohm resistor connected
internally from the input pin to the 5 V sensor supply so that a switch can
be simply connected between the input pin and 0 V.
They can also be connected to a brake switch or other switch.
Digital Inputs
Digital Inputs are identical to Switch Inputs except that they include the
following additional measurement methods:
o Frequency: The frequency of the input signal is measured
o Period: The time between successive pulses is measured
o Pulse width: The low time of the pulse is measured
o Count: Counts the number of pulses
o Beacon: For connection of a lap beacon
Speed Inputs
Speed Inputs are identical to Digital Inputs except that they can also be
configured to suit Variable Reluctance (Magnetic) sensors e.g. some
wheel speed sensors. Because the amplitude of the signal from these