CHAPTER 6
12
6. RPM
The system can receive the RPM signal from three different sources:
n
from ECU
n
through a square wave signal (8 to 50 V)
n
from the low voltage (from 150 to 400 V) of the coil
6.1 RPM from ECU
To get RPM from the ECU, please configure your device and enable RPM channel. RPM is one
of the many data flowing from your ECU.
6.2 RPM via a 5-50 V square wave signal or coil (150-400 V)
In case your engine is not managed by any ECU, the device can read the signal from the low
voltage of the coil (whose peak can be from 150 to 400
V)
or from a possible square wave (the
peak can be from 5 to 50V). The pin labelled "RPM" reported in appendix “Pinout” receives
the signal:
The image shows an example of wiring for the ignition system.
The output, labelled “GRAY TACH” gives a 5-50V output that can be directly acquired. If the
output is not available from the ignition system, the system has to be connected to the low
voltage of the coil,
as shown in the following schematic.
MXL2 MANUALE ENG OK 2016.qxp_Layout 1 28/10/16 14:36 Pagina 13
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