Protocol analysis
R&S
®
RTE
791User Manual 1326.1032.02 ─ 20
"Bit index"
Sets the bit index (data position), or the start value of a bit index
range. Default bit index value is 0, permitted values range from 0 to
65535.
"Bit index to"
Sets the end value of a bit index range (data position range). Availa-
ble only, if the "Bit index operator" is set to "In range". Default bit
index end value is 65535, permitted values range from 0 to 65535.
"Word Length"
Sets the number of bits in an NRZ Unclocked word (hence, the size
of the data frame). Default word length is 8 bits, permitted lengths
range from 0 bits to 31 bits .
Note: The NRZ Unclocked coding standard requires a signal that
contains both a start bit and a stop bit:
●
The start bit should be opposite in polarity to the idle state of the
signal, and it is the first transition detected following the gap time.
●
The stop bit should be the same polarity of the idle state, and it is
the last bit in a data frame.
The end of the stop bit and the detection of the next frame's start bit
constitutes the maximum gap time.
In order for the trigger to operate correctly, you have to specify the
correct word length in the trigger menu. The trigger then counts the
number of bits it decodes, and when the count matches the word
length, the next bit is treated as the stop bit.
"Gap Time"
Sets the minimum gap time for synchronization. The trigger is set to a
position after the gap time, when the other trigger conditions are met.
Default gap time is 10 µs, permitted gap times range from 1 ns to 1 s.
"Bit Rate"
Sets the transmission speed for the data signal. Default bit rate is
10 Mbps, permitted bit rates range from 300 bps to 50 Mbps.
Remote command:
TRIGger<m>:CMSB:PATTern on page 1749
TRIGger<m>:CMSB:ICONdition on page 1749
TRIGger<m>:CMSB:IMIN on page 1749
TRIGger<m>:CMSB:IMAX on page 1750
BUS<m>:CMSB:GAPTime:VALue on page 1742
TRIGger<m>:CMSB:NRZ:WRDLength on page 1750
Advanced
Trigger on various frame types, fields in the frames, and data patterns.
Which settings are available, depends on what you have defined in the "Format" tab.
You can further refine the trigger criteria, selecting which frames you want to select for
the triggering and what conditions their field values must fulfill.
Error types: Item name, Enable ← Advanced
The table lists the error types you can trigger on. Select the required errors in the
"Enable" column. Available are "CRC" error and "Parity" error.
Remote command:
TRIGger<m>:CMSB:ADVanced:ERENable on page 1752
TRIGger<m>:CMSB:ADVanced:ERRor<n>:ENABle on page 1752
Custom: Manchester / NRZ (option R&S
RTE-K50)M
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