Teledyne LeCroy Serial Data Debug Solutions - Manual (Page 63)

Operator's Manual
919586 RevA 63
When the read InterFrame Time is smaller than the one you provided, subsequent bits are considered
part of the same packet and continue to accrue sequentially.
Using the UART-RS232bus Options
Using the UART-RS232bus Options Overview
Both UART-RS232bus D and TD options contain powerful software algorithms to extract serial data information
from physical layer waveforms measured on your oscilloscope. The extracted information is overlaid (annotated)
on the actual physical layer waveforms, and color-coded to provide fast, intuitive understanding.
The UART-RS232bus TD option allows triggering on both DATA conditions and Parity ERRORS. DATA triggering
can be set conditionally to select a range of DATA values to trigger on, not just a single DATA value. Other
powerful and user-friendly features included in UART-RS232bus TD trigger include:

Ability to define the UART byte with 9-bit DATA, with the 9 th DATA bit functioning as an alert bit with a
value settable to 0, 1, or X.

Ability to define as few as 5 bits of DATA in the UART byte.

Polarity configurable to either IdleLow or IdleHigh.

Decoding in Binary, Hexadecimal (Hex), or ASCII formats.

Triggering on up to 12 bytes of DATA in a data string up to 2048 bytes long.

Ability to define the frame the UART byte messages into a single long message packet for purposes of
triggering.

Shortcut setup for RS-232 triggering and decoding.
If you are not familiar with or are just learning about UART or RS-232, start by using the simplest trigger
conditions (single data byte, any position). Then, experiment with the Interframe Time Setup to “frame” the
UART messages into message packets, and trigger on a specific byte value at a known location. Lastly, try
triggering on multiple bytes conditionally (INRANGE, or GREATER THAN) in a known location.
Note: Ask your local LeCroy representative for more information about any Serial Data Debug Solution
Protocols or Toolkits using the Contact LeCroy for Support (on page 199) topic.
UART-RS232bus Decode Setup Detail
For general information about using controls shown on the main Serial Decode dialog, refer to Accessing The D
and TD Supported Protocol Toolsets (on page 13).
UART-RS232 BUS B ASIC AND L EVELS R IGHT -H AND D IALOGS
Access the Serial Decode dialog by touching Analysis → Serial Decode on the menu bar.