Rohde & Schwarz RTE Series - SENT Fast Channel; SENT Message Definitions

Protocol analysis
R&S
®
RTE
732User Manual 1326.1032.02 ─ 20
13.13.1.2 SENT message definitions
SENT terms
See the specific terms and definition used in SENT protocol:
●
Tick (clock tick): basic unit of time
– transmitter-specific nominal clock period
– 3 µs < clock tick <90 µs, with max. 20 % clock variation
●
Nibble: minimum unit of data
– used to transmit data
– variable timing units between two falling edges
SENT fast channel
The SENT protocol enables you to transmit measurements of multiple sensors in one
transmission sequence with data signals of varying length. The diagram in Fig-
ure 13-61 shows, for example, the encoding scheme for two 12-bit data signals.
Figure 13-61: Example of a SENT transmission sequence
The format of a SENT transmission sequence consists of the following pulses:
●
Synchronization/Calibration Pulse:
– initial sequence of the receiver
– the start condition is the falling edge of the last pulse (CRC or Pause)
– nominal pulse period is 56 clock ticks
– measures the actual clock variation of the transmitter and calculates the tick
timing
●
Status/Communication Pulse (Nibble)
– one 4 bit pulse
– communicates status and enables the sensor to include slow channel message
bits
0: (LSB) specific application
1: specific application
2: Serial Data message or specific application (e.g. Infineon TLE4998S)
3: (MSB) 1= message start; 0=Serial Data message or specific application
(e.g. Infineon TLE4998S)
– 12 to 27 clock ticks
– not included in CRC frame calculation
SENT (option R&S
RTE-K10)