T10 Installation Notes v1.7
Generic T10 Installation Notes v1.7.doc 12.08.2015
Page 17
5.5.5 Inputs Installation (T10-Lite 9wire ONLY)
The T10-Lite 9wire product has a single Input (Pin 9) and it is of a digital type.
It is not configurable and it is NOT capable of processing analogue signals.
It is ONLY available in the 70-30 hardware code range and the CAN twisted pair of wires take on
NEW functionality (See Can section).
Digital Input Specification
The Input (Blue/White tracer) is capable of monitoring automotive signals in the signal range
from -30v to +30v. The input is deemed to have “GONE HIGH” when the voltage is greater
than 6v and “GONE LOW” when the voltage is less than 6v (including the open circuit state see
below).
Therefore the connection of the input wire into a vehicle circuit varies depending on the voltage
of the circuit being monitored and the direction of state change you are wishing to detect.
In the open circuit state the T10-Lite input is in the low state and therefore careful consideration
must be given when wiring up the input to ensure the change of state produces the required
trigger you are after especially if you want to detect both the “GOES HIGH” and “GOES LOW”
state change.
Below are some examples of monitoring circuit state changes.
Signal Transition from 0V to +12v/+24v
If the input monitoring is a signal or switch circuit that is producing the actual voltage transition
then the input wire can be connected directly to the circuit and it should be possible to detect
both state transitions.
Signal Transition from open circuit to +12v/+24v
If the input monitoring requires the detection of a switch closing to supply (+12v/+24v) then the
input is simply wired to the normally open side the switch.
Signal Transition from >6v to +12v/+24v
If the input monitoring requires the detection of a voltage change that does not transition below
6v then a potential divider is required to drop the lower voltage state into the triggering region.
To keep the current drain to a minimum then the combined resistance value should be greater
than 10K to keep the current below 1mA.
Signal Transition from open circuit to 0V
If the input monitoring requires the detection of both state transitions of a switch switching from
open circuit to ground, then a pull up resistor is required to generate the “GOES HIGH” state
when the switch becomes open circuit. Again the resistor value should be greater than 10K to
keep the current drain to a minimum when the circuit is closed.
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