Individual tests
5.10 Layer 2 - signal levels per identifier
In the operating mode "layer 2" (default setting), the CANcheck measures the dif-
ferential and absolute signal level of all recorded message identifiers. First the
CANcheck generates a list of identifiers during the scan time (the default setting
is 10 s). Then the CANcheck measures the differential and absolute signal level for
each recorded identifier separately as often as averaging requires (the default set-
ting is 3).
If the identifiers in your CAN network are repeated with a period longer than
10 s, you must change the scan time. This is done via the menu item "Settings".
You can also change averaging via the menu item "Settings".
The CANcheck analyzes the signal level for each identifier separately. The limits
are given in section 10.1. In this way you can detect identifiers that are transmit-
ted with a weak signal level and may be causes of transmission errors.
In order to allocate an identifier to a CAN node, however, you require the alloca-
tion between identifier and CAN nodes in your CAN network. The CANcheck can
only determine the allocation if your CAN network works according to the
CANopen standard (see section 5.11).
For the measurement of the signal level you can connect the CANcheck to the
CAN network at any point:
•
If there is a free SUB-D9 socket in the CAN network, you can connect the
CANcheck to this socket via the 1-to-1 cable.
•
If this is not the case, you can loop in the CANcheck between any CAN node
and the CAN network via the Y cable.
Please put the CAN network into operation before you start measuring the signal
level.
Please select the menu item "Signal per identifier" with the keys UP and DOWN
and press the OK key.
Individual tests
▼
▲
►
-Line impedance
-Power supply
-Baudrate detection
-Identifier scan
-Bus load
-Signal levels per id
During the measurement, first the baudrate is detected and the relevant message
appears. Then the scan for identifiers is carried out and a second message ap-
pears. Then the signal levels are measured and a third message appears.
Copyright IXXAT Automation GmbH
CANcheck Manual, Version 1.2
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