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Protocol Analysis
R&S
®
RTM20xx
149
User Manual 1317.4726.02 ─ 01
If you want the instrument to set the thresholds based on the analysis of the signals, press
"Find level" in the protocol's "Configuration" menu.
1. Press the CH N key of the required channel.
2. Press the "More" softkey.
3. Press "Threshold" and enter the voltage value.
4. Repeat step 1 to 3 for all channels that are used for protocol analysis.
To configure decoding and data display
1. Press the PROTOCOL LOGIC key on the front panel.
2. If the "Logic" menu is displayed, press "Protocol".
3. Press "Decode" to display the content of the messages in an easily readable and
comprehensible form.
4. Press "Display".
5. Press "Bits" to display the individual bit lines above the decoded data.
6. Press "Data format" to select the decoding format: Binary, Hexadecimal, Decimal or
ASCII.
7. To attach a descriptive label to the decoded bus, enable "Label" and select a prede-
fined text from the "Library", or enter a user-defined text using "Edit Label".
8. To adjust the position and size of decoded information on the screen, use the vertical
POSITION and SCALE rotary knobs.
11.1.2 Protocol - Common Settings
The common settings in the "Protocol" menu define the bus type and open further menus
to adjust the display of the decoded bus signal.
Access: PROTOCOL LOGIC > if "Logic" menu is displayed: "Protocol"
Bus
Selects the bus to be configured.
SPI/SSPI and UART protocols occupy two bus lines (bus 1 and 2 or bus 3 and 4). If one
of these buses is configured, the number of buses (suffix <b>) is reduced. Bus 2 and/or
bus 4 is not available.
Basics of Protocol Analysis