Protocol Analysis
R&S
®
RTM20xx
197User Manual 1317.4726.02 ─ 01
11.6 LIN (Option R&S RTM-K3)
The Local Interconnect Network (LIN) is a simple, low-cost bus system used within auto-
motive network architectures. LIN is usually a sub-network of a CAN bus. The primary
purpose of LIN is the integration of uncritical sensors and actuators with low bandwidth
requirements. Common applications in a motor vehicle are the control of doors, windows,
wing mirrors, and wipers.
11.6.1 The LIN Protocol
This chapter provides an overview of protocol characteristics, frame format, identifiers
and trigger possibilities. For detailed information, order the LIN specification on http://
www.lin-subbus.org/ (free of charge).
LIN characteristics
Main characteristics of LIN are:
●
Single-wire serial communications protocol, based on the UART byte-word interface
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Single master, multiple slaves - usually up to 12 nodes
●
Master-controlled communication: master coordinates communication with the LIN
schedule and sends identifier to the slaves
●
Synchronization mechanism for clock recovery by slave nodes without crystal or
ceramics resonator
The R&S RTM 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 master.
●
Master sends a message header including the synchronization break, the synchro-
nization 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.
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.
Fig. 11-14: Structure of a byte field
Data bytes are transmitted LSB first.
LIN (Option R&S RTM-K3)
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