Trigger Setu p
For example, if the number of bytes is one, the o scilloscope will attempt to match the first byte, second byte, third , and so
on within the packet.
If the number of bytes is two, the oscilloscope will try to match any two consecutive bytes, such as one and two, two and three,
three and fo ur, and so on. If the oscilloscope finds a match, it will trigger.
Specific byte matchin g ( no n-ro lling window matchin g for a specific position in the packet) for I
2
C, SPI, and
CAN.
You can trigger on a specificbyteforI
2
C, SPI and CAN in several wa ys:
For I
2
C an d SPI, enter the number of bytes to match the number of bytes in the signal. Then use don’t cares (X) to mask the
bytes that you are not interested in.
For I
2
C, push the lower-bezel Trigger On to trigger on Address/Data.PushAddress. On the side-bezel menu, push Address,
and rotate multipurpose k nob s a and b as needed . Set the addre ss to don’t cares (X) if you want to mask the address. The
data will be matched starting at the first byte without using a rolling window.
For CAN, triggering occurs when the user-selected data input matches th e data and qualifier in the signal starting at the first
byte. Set the numbe r of bytes to match the number of bytes of interest. Use the data qualifier to perform: =, !=, <, >, >=,
and <= operations. Triggering on identifier and data always matches the identifier and data selected by the user, with the
data starting at the first byte. No rolling w indow is used.
RS-232 Bus Trigger Data Matching
You can trigger on a specific data value for RS-232 bytes. If you defined an end-of-packet character to use for RS-232 bus
decoding, you can use the same end-of-packet character as a data value for trigger data matching. To do so, choose th e Tx End of
Packet or the Rx End of Packet character as the Trigger On selection.
DPO3000 Series Oscilloscopes User Manua l 129
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