GW Instek GDS-3000 Series DS3-SBD Serial Bus decode - Manual (Page 20)

GDS-3000 Serial Decode User Manual
20
I 2 C Time, Repeat Start, Address, Data,
Missing Ack.
SPI Time, MISO frame data, MOSI
frame data.
Example Below shows the data associated with an SPI event
table in a spreadsheet.
Time MOSI MISO
-11.60us 0D87 0D87
-10.16us 06C0 06C0
-8.720us 8343 343
-7.282us 243 243
-5.840us 0C88 0C88
UART Serial Bus Interface
The UART serial bus software is designed to decode RS232 and
other common RS-232 variants such as RS-422, RS-485. The
software configuration is also flexible enough to decode the many
proprietary protocols based on RS-232.
Background Basic RS-232 protocol uses single-ended data
transmissions. The signal voltage levels can be
high (±15V) and employ active low signaling.
High speed variants of RS-232, such as RS-422 and
RS-485 use differential signaling and commonly
employ low voltage differential signals with active
high signaling.
Universal Asynchronous Receiver / Transmitter
(UART) or RS-232 driver/receiver ICs commonly
used for embedded applications typically use
active high signaling with standard IC signal
levels.
Panel operation 1. Insert each of the bus signals (Tx, Rx) to one of
the oscilloscope channels.