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SAINT
Keyword 2000 to RS-
232 Gateway
01/20/04 Page 7 of 20
4.2 Messages IDs
Message IDs are one byte long and have the following general format:
Type (CAN, BEAN,
ACP,Class 2, IIC, etc)
Command (Cmd=1) Tx (1) / Rx (0) Time Stamp (TS)
Bits 3 - 7 bit 2 bit 1 bit 0
The upper nibble indicates the type of message. The following types are defined:
• Gateway (08)
• Keyword 82 (10h)
• Keyword 71 (18h)
• IIC (20h)
• Keyword 2000 (28h)
• IDB (30)
• ACP (38h)
• E&C (40h)
• J1708 (48h)
• CAN (50h)
• Class2 (60h)
• Class2 Block (68h)
• SPI (70h)
• BEAN1 (90h)
• BEAN2 (98h)
Bits 3 to 7 identify the specific communication bus (i.e., Class 2, CAN bus, etc.). Bit 2 is used to designate a
command or setup message when set to 1. Bit 1 is the transmit or receive bit with 1 designating transmit and 0
designating receive. Bit 0 is used to designate the Time Stamp. In general, report messages from the gateway use
the same identifiers as commands to the gateway.