User Manual

MSO-2000E & 2000EA User Manual
128
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.
Operation
1. Connect each of the bus signals (Tx, Rx) to one
of the oscilloscope’s analog or digital channels.
Connect the ground potential of the bus to one
of the probes’ ground clip if you are using the
analog channels or to the ground connector of
the Digital card if you are using the digital
channels.
Tx
GND
Rx
X
10
X
1
G
1
2
X
10
X
1
Analog
Digital
2. Press the BUS key.
BUS
B