R&S RTO6 - Page 522

Protocol analysis
R&S
®
RTO6
522User Manual 1801.6687.02 ─ 05
See also: Chapter 13.1.1, "Setup - general settings", on page
485
Source: Tx, Rx
Select the input channels for the transmitter and receiver signals.
Usually
, the source is one of the analog channels. Reference and math waveforms are
available as source if the trigger source is one of the analog channels but not the serial
bus.
Do not combine a reference waveform with channel or math waveform because the
time correlation of these waveforms might differ.
Alternatively, digital channels can be used if MSO option R&S RTO6-B1 is installed.
Digital and analog channels cannot be used at the same time.
For triggering on a serial bus, analog or digital channel sources are required.
Remote command:
BUS<m>:UART:TX:SOURce on page 1728
BUS<m>:UART:RX:SOURce on page 1727
Threshold
Sets the threshold value for digitization of signals for each line. If the signal value on
the line is higher than the threshold, the signal state is high. Otherwise, the signal state
is considered low if the signal value is below the threshold. The interpretation of HIGH
and LOW is defined by the Polarity.
Note: If the sources are digital channels, the same threshold values are used for the
parallel and the serial buses. You can set the thresholds either in the parallel bus con-
figuration or in the serial bus configuration.
"Threshold"
Enter the value directly in the field.
"Find thresh-
olds"
Executes the measurement of reference levels and sets the thresh-
olds to the middle reference level of the measured amplitude.
Remote command:
BUS<m>:
UART:RX:THReshold
on page 1728
BUS<m>:UART:TX:THReshold on page 1728
BUS<m>:UART:TECHnology on page 1729
BUS<m>:SETReflevels on page 1671
BUS<m>:FAUToset on page 1671
Polarity
Defines the logic levels of the bus. The idle state corresponds to a logic 1. the start bit
to a logic 0. "Idle high" (high=1) is used, for example, for control signals, while "Idle
low" (low=1) is defined for data lines (RS-232).
Remote command:
BUS<m>:UART:POLarity on page 1730
Bit rate
Sets the number of transmitted bits per second. To select a bit rate from list of prede-
fined values, tap the icon beside the "Bit rate" field. To enter a specific value, open the
keypad. The list of predefined values is also available in the keypad.
UART/RS-232/RS-422/RS-485 (option R&S RTO6-K510)