User's Manual

Product Specification and User Manual RFID GEN3 System
CONFIDENTIAL
Page 19 of 34
3 RFID GEN3 Functional Specification
3.1 Bidirectional Communication
3.1.1 CAN variant
The RFID Post is designed to exchange information via CAN protocol with the ECU. Refer
to software specification.
3.1.2 MOWP variant
The RFID Post is designed to exchange information via Maxim 1-Wire protocol with the
ECU. It is also possible to communicate with the module using a MPI2.5 CAN-to-MOWP
converter for diagnostics purposes.
3.2 Cut-off System
The RFID DESS Post’s contact output serves as a Fail-Safe Cut-off system, based on a
non-contact magnetic switch, that sends a stop signal to the vehicle engine in case of a
key disconnection (i.e: driver fell-off of vehicle).
3.2.1 Cut-off System override
The CAN variant offer the possibility to override the Cut-off system (i.e. activate the
Contact output) through a CAN command. Refer to the software specification for details.
Figure 6 show a representation of the circuit, where HALL_SIGNAL is the control signal
from the hall sensor that is activated when a key is attached to the base station, and
where the µc_HALL_OVERRIDE is the control signal from the microcontroller. The
CONTACT_OUT is directly connected to the output pin B (CONTACT). Q3 is not
populated in the MOWP variant.