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The CAN Data Telegram
The CAN data telegram is composed of the 11-bit identifier, which sets the communication protocol, and the 0–7
data bytes field, which includes the information (such as commands and parameters) to be communicated.
Structure of the 11-Bit Identifier
The identifier is part of a CAN telegram. It is created by the programmer in compliance with the regulations
applicable to the unit. The identifier consists of 11 bits and has the structure shown in the table below. The bits are
transmitted from left to right.
• Bit 10 informs of the sender of the telegram. (Master Request: bit 10 = 0; Slave Response: bit 10 = 1)
• Bits 9 to 6 contain the command code as a 4-digit binary number.
• Bits 5 to 0 contain the slave address 63 (decimal) of PICO Controller. This address can not be changed.
• Hex format of 11-bit identifier: 1FF for request; 5FF for response.
Bit 10
Bit 9
Bit 8
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
0=Master
request
0
1
1
1
1
1
1
1
1
1
1=Slave
response
0
1
1
1
1
1
1
1
1
1
Structure of Data Bytes 0–7
The data bytes field is also part of a CAN telegram. It is 64 bits long. It contains commands (READ, WRITE, STORE,
ERASE, START, STOP, KEEP ALIVE), channel/line address information, parameter information (ValueCode, Value),
and status information (Error, Busy).
Byte 0 = C Channel
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0 Nibble Value
Decimal
Description
0
0
0
1
Ch
Ch
Ch
Ch
1
READ parameter
0
0
1
0
Ch
Ch
Ch
Ch
2
WRITE parameter
0
1
0
0
Ch
Ch
Ch
Ch
4
STORE parameter to EE
0
1
0
1
Ch
Ch
Ch
Ch
5
ERASE parameter in RAM
0
1
1
0
Ch
Ch
Ch
Ch
6
STORE parameter to EE and flash
0
1
1
1
x
x
x
x
7
KEEP ALIVE
1
0
0
0
Ch
Ch
Ch
Ch
8
START C Line
1
0
0
1
Ch
Ch
Ch
Ch
9
STOP Channel
Cmd
Cmd
Cmd
Cmd
1
0
0
0
8
Channel 1
Cmd
Cmd
Cmd
Cmd
0
1
0
0
4
Channel 2
Cmd
Cmd
Cmd
Cmd
0
0
1
0
2
Channel 3
Cmd
Cmd
Cmd
Cmd
0
0
0
1
1
Channel 4
Cmd
Cmd
Cmd
Cmd
1
1
1
1
15
Channels 1+2+3+4
Cmd
Cmd
Cmd
Cmd
1
1
0
0
12
Channels 1+2
Cmd
Cmd
Cmd
Cmd
0
0
1
1
3
Channels 3+4
PICO Controller 2+2-XCH-V3
22
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