User's Manual

all value of previous bytes.
The format of register read command return echoed from In-Car Trigger
would be the listed:
Byte Index
Byte 0
Byte 1
Byte 2
Byte 3
Byte 4
Byte 5
Field Name
PID
Op. Code
Base Address
(High Byte)
Base Address
(Low Byte)
Access Length
Result
Value
0xA1
0x00
Addr >> 8
Addr & 0x00FF
N (Note #1)
(Note #3)
Byte Index
Byte 6 ~ Byte (6 + (N - 1))
Byte (6 + N)
Field Name
Data
Checksum
Value
Context of Registers
(Note #2)
(Note #3) Value of Result must be 0x00 to indicate command handling
without error.

Registers write
The UART command format to write
N bytes data started from address Addr
into register table.
Byte Index
Byte 0
Byte 1
Byte 2
Byte 3
Byte 4
Field Name
PID
Op. Code
Base Address
(High Byte)
Base Address
(Low Byte)
Access Length
Value
0xA1
0x01
Addr >> 8
Addr & 0x00FF
N
Byte Index
Byte 5 ~ Byte (5 + (N - 1))
Byte (5 + N)
Field Name
Data
Checksum
Value
Context of Register
(Note #2)
The format of register read command return echoed from In-Car Trigger
would be the listed:
Byte Index
Byte 0
Byte 1
Byte 2
Byte 3
Byte 4
Byte 5
Field Name
PID
Op. Code
Base Address
(High Byte)
Base Address
(Low Byte)
Access Length
Result
Value
0xA1
0x01
Addr >> 8
Addr & 0x00FF
N
(Note #3)
Byte Index
Byte 6
Field Name
Checksum
Value
(Note #1)