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Serial Bus Analysis
R&S
®
RTB2000
183User Manual 1333.1611.02 ─ 03
Remote command:
BUS<b>:I2C:DATA:SOURce on page 384
Threshold, Find Threshold
Set the signal threshold for the source channel. Enter a value, or use "Find Threshold"
to set the threshold to the middle reference level of the measured amplitude.
For analog channels, you can find the value also in the "Vertical" menu > "Chan-
nel <n>" >"Threshold"
For logic channels, you can find the value also in the "Logic" menu > "Threshold".
Remote command:
CHANnel<m>:THReshold on page 256
CHANnel<m>:THReshold:FINDlevel on page 256
DIGital<m>:THReshold on page 433
12.3.3
I
2
C Trigger
Before you set up the trigger, make sure that the bus is configured correctly. See
Chapter 12.3.2, "I
2
C Configuration", on page 182.
To trigger on I
2
C signals:
1. Press the PROTOCOL key in the Analysis area of the front panel.
2. Select the bus that is configured for I2C.
3. Select "Trigger".
This selection has several effects:
● Enables decoding, if necessary.
● Sets the "Trigger Type" to "Serial Bus" and the trigger source to the selected
bus.
● Displays the trigger conditions in the dialog box, below the protocol setup.
4. At "I2C Trigger", select the required trigger type:
● "Start": beginning of the message
● "Stop": end of the message
● "Restart": repeated start condition
● "~Acknowledge": transfer of data bits is not acknowledged
● "Address and Data": address pattern and/or up to 3 data bytes
5. If "Identifier" or "Identifier and Data" is selected, the CAN trigger setup dialog
expands to define the serial pattern.
6.
If "Address and Data" is selected, the I
2
C trigger setup dialog expands to define the
serial patterns.
I²C (Option R&S RTB-K1)
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