HLS-442 datasheet(7/22 Pages) AMSCO

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[v1-00] 2015-Mar-30

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HLS-442 − Electrical Interface

Messages From the Sensor

The main message sent from the sensor to the control unit is

the Sensor Status Message, hereafter referred to as the SSM.

After 700 ms from power-ON of the sensor it will start sending

the SSM frame as defined below. The SSM, after this event, is

transmitted periodically with a 100 ms interval until the sensor

is powered OFF. Besides the SSM, the sensor can also send a

Wake-Up pulse. This is described in detail in Wake-Up Function.

The Wake-Up pulse is separate from the SSM and has no impact

on the SSM.

The figure below defines the data field of the SSM CAN data

frame. The data field uses 8 bytes. The CAN ID as described

earlier sets the arbitration field.

Figure 8:

CAN Matrix Message Layout

Parameter

Name

Data

Size

Physical

Measurement

Range

Value

Range

Byte

No.

Concentration

8 bits

0 – 4.4 %

[20 -240]

H2 Concentration

Protection

Value 1

8 bits

pv1

FE high

8 bits

FE high

CRC16 Byte 1

(Higher Byte)

8 bits

CRC16

FE low

2 bits

FE low

Protection

Value 2

2 bits

pv2

Sensor

Number

3 bits

[1 - 7]

Msg. Counter

8 bits

[0 - 255]

Msg Counter

Sensor status

2 bits

[0 - 3]

status

Part number

5 bits

[1 - 31]

Part number

CRC16 Byte 2

(Lower Byte)

8 bits

CRC16

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