
23 |
P a g e
6.3 Signal Inputs
6.3.1 Analogue/Digital Inputs
The FM 3617i/FM 3717i/FM 3817i is equipped with eight analogue/digital inputs (I1-I8), which can be used to
monitor either digital or analogue signals. The eighth Analogue/Digital input (I8) is shared with the fourth
frequency input (F4). The external inputs and ignition line are protected from typical vehicle transients and can
be directly connected to most vehicle inputs between 0 and
33 V. The input impedance is >100 kΩ. Input
signal voltage range and resolution is selectable from the Fleet Manager software. For digital type input
signals, switching thresholds can be defined in the software. When the threshold is crossed, an event is
triggered to record the specified data. Please refer to the “Specifications” and “Harness Installation” sections,
of this document, for more details. Typical connections are shown below: