IFM JN2301, Руководство по эксплуатации устройства, Страница: 8 / 25

Inclination sensor JN
8
7.2 Proprietary PDU format 1 protocol
The parameters of the JN2301 sensors are listed in a table that is accessed per
16-bit index. To access the sensor parameters in reading or writing the proprietary
PDU format 1 message is used. PDU format (PF) corresponds to the value 0xEF.
In this case the PDU-specific byte (PS) is the target address (DA) of the unit which
the message is to be sent to.
Example
Address target unit (ECU): 0x19
Address control unit / master: 0x14
Priority of the message: 3
CAN identifier 8-byte data frame
ID 29 bits Parameter index 2 bytes Read/write 1 byte Status 1 byte 4-byte data
Request: Master → ECU
0xCEF1914 LSB MSB RW 0 LSB .. .. MSB
Answer: Master ← ECU
0xCEF1419 Index RW SC LSB .. .. MSB
Parameter index: 2-byte parameter index.
RW : Read parameter → 0x00 / write parameter → 0x01
SC : Status code
0x00: OK
0x01: parameter value too small
0x02: parameter value too big
0x03: parameter index does not exist
0x04: parameter can only be read
0x05: parameter can only be written
0x06: no access to parameter
0x07: invalid data size
0x08: parameter writing blocked (e.g.: If the same value of a parameter is written
which is already set in the sensor)
0x09: invalid command
0x0A: unknown error