Serial bus analysis
R&S
®
RTM3000
299User Manual 1335.9090.02 ─ 09
LIN characteristics
Main characteristics of LIN are:
●
Single-wire serial communications protocol, based on the UART byte-word inter-
face
●
Single primary, multiple secondaries - usually up to 12 nodes
●
Primary-controlled communication: primary coordinates communication with the
LIN schedule and sends identifier to the secondaries
●
Synchronization mechanism for clock recovery by secondary nodes without crystal
or ceramics resonator
The R&S RTM3000 supports several versions of the LIN standard: v1.3, v2.0, v2.1 and
the American SAE J2602.
Data transfer
Basic communication concept of LIN:
●
Communication in an active LIN network is always initiated by the primary.
●
The primary sends a message header including the synchronization break, the
synchronization byte, and the message identifier.
●
The identified node sends the message response: one to eight data bytes and one
checksum byte.
●
Header and response form the message frame.
Figure 13-29: LIN frame with header and response
The data is transmitted in bytes using the UART byte-word interface without the parity
bit. Each byte consists of a start bit, 8 bits and a stop bit.
Figure 13-30: Structure of a byte field
Data bytes are transmitted LSB first.
LIN (option R&S
RTM-K3)
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