HLS-442 datasheet(9/22 Pages) AMSCO

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[v1-00] 2015-Mar-30

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HLS-442 − Electrical Interface

Figure 9:

Pseudo Code Description of Protection Value

FE High / FE Low

The raw FE signal is available in 10-bit resolution (1 step = 4mV).

The high 8 bits are available in byte 2 and the lower 2 bits in

byte 7, bit 6-7. The data range is 0-4092mV.

CRC16

Byte 3 and byte 7 form a 16-bit CRC value. The CRC is CCITT

CRC16.

Sensor Number

Sensor Number is defined by power supply feeds and CAN ID

assigned sensor number is repeated in byte 4 bit 2-4. The value

sent is given in Bus Identification.

Message Counter

The message counter is incremented by 1 after each

transmission of a SSM frame. After the counter reaches 255 it

wraps around and the next transmitted counter value

becomes 0. At sensor start-up the message counter begins at 1.

Pseudo Code

Description

pv[9 - 8] = status[1 - 0]

Assign two most significant bits of pv as the status bits

pv[7 - 0] = code[7 - 0]

Assign 8 least significant bits of pv as the code bits

pv[9 - 0] = pv[9 - 0] +

msgcnt[1 - 0]

To pv add the number formed by two least significant bits of the message

counter

pv[9 - 0] = NOT pv[9 - 0]

Perform bitwise inverse of pv

pv[9 - 0] = pv[9 - 0] + 1

To pv add 1

pv1[7 - 0] = pv[7 - 0]

Form protection value 1 of the 8 least significant bits of the 10-bit

protection value

pv2[1 - 0] = pv[9 - 8]

Form protection value 2 of the 2 most significant bits of the 10-bit

protection value

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