GW Instek GDS-2000A series Option User Manual - Manual (Page 54)

GDS-2000A Series Options Manual
54
SPI The SPI (Serial Interface Peripheral) bus is fully
configurable to accommodate the wide variety of
SPI interfaces. This bus is only available on 4
channel models.
Inputs SCLK, SS, MOSI, MISO
Threshold SCLK, SS, MOSI, MISO
Configuration SCLK edge, SS logic level, Word
size, Bit order
Trigger On SS Active, MOSI, MISO,
MOSI&MISO
UART Serial Bus Configuration
The UART bus menu is designed to decode RS-232 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.
*Note: the GDS-2000A does not support ±15V
signaling for the Logic Analyzer inputs)