Schrader Electronics AG2SM3 Users manual

Schrader Electronics Ltd
Unit 11 Technology Park
Belfast Road
Antrim, Northern Ireland, BT41 1QS
United Kingdom

Tyre Pressure Monitoring Sensor

Model: AG2SM3

Product Specification / User Manual

The TPMS Transmitter is installed to the valve stem in each tyre of a vehicle. The unit measures tyre
pressure periodically and transmits this information by RF communication to a receiver inside the vehicle.
In addition, the TPMS Transmitter performs the following functions:

 Determines a temperature compensated pressure value.
 Determines any abnormal pressure variations in the wheel.


Monitors the state of the Transmitters’ internal battery and informs the receiver of a low battery
condition.

Modulation

During the Rotating Mode, The modulation used for the sensor is FSK (Amplitude -Shift Keying)
with 50% Manchester bi-phase encoding.

Schrader Electronics Ltd
Unit 11 Technology Park
Belfast Road
Antrim, Northern Ireland, BT41 1QS
United Kingdom

Modes of Operation

Rotating Mode

While the sensor/transmitter in the Rotating Mode, it shall satisfy the following requirements. The
sensor/transmitter shall transmit an instantaneous measured data, as defined in Section 3.1 of this
document, if a pressure change of 2.0 psi from the last transmission or greater has occurred with respect
to the following conditions. If the pressure change was a decrease of pressure, the sensor/transmitter
shall transmit immediately every time it detects the 2.0-psi or greater pressure changes from the last
transmission.
If the pressure change of 2.0 psi or greater was an increase of pressure, the sensor shall not react to it.

Stationary Mode

While the sensor/transmitter in the Stationary Mode, it shall satisfy the following requirements. The
sensor/transmitter shall transmit an instantaneous measured data, if a pressure change of 2.0 psi from
the last transmission or greater has occurred with respect to the following conditions. If the pressure
change was a decrease of pressure, the sensor/transmitter shall transmit immediately every time it
detects the 2.0-psi or greater pressure changes from the last transmission.

If the pressure change of 2.0 psi or greater was an increase of pressure, the silent period between the
RPC transmission and the
last transmission shall be 30.0 seconds, and the silent period between the RPC transmission and the next
transmission (Normal scheduled transmission or another RPC transmission) shall also be 30.0 seconds, to
be in compliance of FCC Part 15.231.

Factory Mode

The factory mode is the mode that the sensor shall transmit more often in the factory to assure the
programmability of the sensor ID during the manufacturing process.

Off Mode

This Off Mode is only for production parts sensors that are used for the builds during the production
process and not in the service environment.

LF Initiation

The sensor/transmitter must provide data upon the presence of an LF signal. The sensor must react
(Transmit and provide data) no later than 150.0 ms after the LF data code has been detected at the
sensor. The sensor/transmitter must be sensitive (As sensitivity is defined in Table 1) and able to
detect the LF field.