User manual

48
Serial Bus Analysis
allows you to specify the data bit pattern or HEX values
for up to 8 bytes (only available if DATA was selected as
frame type). Available comparisons for address and data
values are GREATER, EQUAL OR LESS, EQUAL and NOT
EQUAL.
Press the MENU OFF button twice or three times to close
all menus, and the oscilloscope will trigger on the set data.
Formeasurementswithoutmeasuringobjectpleaserefer
to chapter 10.2.5.
13.8 LIN BUS
The LIN bus (Local Interconnect Network) is a simple
master/slave bus system for automotive applications and
is used for the data exchange between controller units and
sensors or actuators. The signal is transmitted on one line
with ground reference to the vehicle mass. A LIN BUS has
the following properties:
❙ Serial single-wire communication protocol (byte-oriented)
❙ Master-slave communication (generally up to 12 knots)
❙ Master-controlled communication (master initiates /
coordinates communication)
The data is transmitted in bytes without parity (based on
UART). Each byte consists of a start bit, 8 data bits and a
stop bit.
13.8.1 LIN BUS Conguration
After choosing the BUS type LIN in the BUS menu press
the soft menu key CONFIGURATION. In the menu that
For CAN BUS trigger and decoding you need the HOO12 option or
the upgrade voucher HV112.
Fig. 13.14: LIN byte structure
Prior to the BUS conguration it is necessary to set the correct
logic level (threshold). Please refer to chapter 4.5. The default
setting is 500 mV.
knob. The soft menu IDENTIFIER SETUP below allows
youtospecifythelengthoftheidentiertypeviasoft
menu key ID TYPE and universal knob (11 bit base or 29
bits for extended CAN frames). The soft menu key
COMPAREdenesthecomparisonfunction.Ifthepattern
includes at least one X (don’t care), it is possible to trigger
onavalueequalornotequaltothespeciedvalue.Ifthe
pattern includes only 0 or 1, it is possible to trigger on an
areagreaterthanorlessthanthespeciedvalue.The
PATTERN INPUT may be binary or hexadecimal. If you
choose the binary input, the soft menu key BIT and the
universal knob allow you to select which individual bits
within the data are to be edited. Select the option STATE
to assign a logic state to each bit (High = H = 1, Low = L
=0orX=don’tcare).ThestateXdenesanystate.If
you choose the hexadecimal input, the soft menu key
VALUE and the universal knob allow you to set the value
for the respective byte. If the input is hexadecimal, only
the entire byte can be set to X. Use the soft menu key
BYTE to toggle between bytes.
❙ IDENTIFIER AND DATA: Includes the same settings as
the soft menu IDENTIFIER. In the menu that opens you
can select the FRAME TYPE (general data or read data)
via top soft menu key and universal knob. In the menu
IDENTIFIER SETUP below you can enter the address of
the respective pattern. The soft menu DATA SETUP
Fig. 13.12: CAN BUSconguration
Fig. 13.15: LIN BUS menuFig. 13.13: CAN BUS