Hioki MR8904, Инструкция по эксплуатации

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5.4 Creating Condition Settings Files
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Next, set the CAN communications conditions. Read the following precautions carefully before setting the
conditions:
Setting CAN communications conditions
When ACK response is enabled, the unit may affect the operation of the CAN bus as
well as systems connected to the CAN bus. Improper settings may cause CAN com-
munications to become corrupted, and proper operation may also affect system
operation, causing bodily injury or property damage. Use only after carefully consid-
ering these effects.
• If the interface does not match the interface of the CAN bus being measured, the instru-
ment will be unable to make measurements, and if ACK is turned on, CAN communica-
tions may become corrupted. Use only after verifying that settings match the CAN bus to
which the unit is connected.
• The use of too few or too many terminating resistors on the CAN bus may prevent data
from being sent and received properly not only by the unit, but by other nodes as well.
Verify carefully and set so that there are two 120

resistors for the entire CAN bus.
• If the baud rate differs from the baud rate of the CAN network to which the unit is con-
nected, the instrument will be unable to make measurements, and if ACK is turned on,
CAN communications may become corrupted. Use only after verifying that the baud rate
matches the network’s baud rate.
• The terminator setting is valid only when the interface is set to high-speed. Separate ter-
minator resistors are necessary when using low-speed or single-wire settings.
• If the ACK response setting is disabled, no message will be sent, even if the transmit ID
frame has been set. To send messages, enable ACK response.
• Baud rate automatic detection is enabled only when ACK is off. When ACK is on, select
the appropriate baud rate for the network.
• A number of messages must be received before the baud rate can be automatically
detected. Messages cannot be properly received until the detection process completes.
Have the unit receive several messages before starting measurement and verify that they
are being properly received, for example by observing the LEDs.