PCAN-LIN – Protocol Definitions
Serial Protocol
5
1 Communication with a PCAN-
LIN Module
The main communication with a PCAN-LIN module is done via the
RS-232 interface. It is divided in structures containing information
about the operation being done, the interface on the module being
affected, needed parameters, data transmitted by CAN and LIN
messages, or scheduler entries. Because the latter case requires
more data, “Write Data” and “Scheduler Entry” commands use a
more complex structure.
A total of eight different structures are used: two for the communi-
cation between host and module, two for reading and writing CAN
messages, two for reading and writing LIN messages, and two for
retrieving and setting entries of a LIN master scheduler.
1.1 Serial Protocol
1.1.1 Data Transmission Host – Module
Bit position Byte Description
7 6 5 4 3 2 1 0
1 STX 0 0 0 0 0 0 1 0
2 Sequence code X Sequence no. Parameter byte count
3 Control code Target
interface
Command code
4…n Parameters Number of parameters depends on the parameter
byte count part of the sequence code.
n+1 Checksum Bitwise exclusive-OR operation between all bytes
of this messages except the STX byte (first byte,
start byte).
