User manual

Acquire the Sign
al
This example of an Event Table is from an
RS-232 bus.
RS-232 event t
ables display one line for each
7- or 8-bit byte when Packets are set to Off.
RS-232 event tables display one line for each
packet when P
ackets are set to On.
Other buses display one word, frame, or
packet per row, depending on the bus type.
9. Push B1 or B2 and turn Multipurpose a
to move the bus display up o r down on the
screen.
I
2
CBus
To acqui
re data from a n I
2
C bus, you need to also set up these items:
1. If you select I2C, push Define Inputs and
the app
ropriate side menu choices.
Bus B1
I2C
Define
Inputs
Thresholds Include
R/W in
Address
No
B1 Label
I2C
Bus
Display
Event
Table
You can
assign the predefined SCLK Input
or SDA Input to the channel connected to
the signal.
2. Push Include R/W in Addr ess and then
push the desired side button.
This c
ontrol determines how the oscilloscope
shows the I
2
C addresses in bus decode
traces, cursor readouts, Event Table listings,
and t
rigger settings.
If you select Yes, the oscilloscope displays 7-bit addresses as eight bits, where the eighth bit (LSB) is the R/W bit. It
disp
lays 10-bit addresses as 11 bits where the third bit is the R/W bit.
If y
ou select No, the oscilloscope displays 7-bit addresses as seven bits, and 10-bit addresses as ten bits.
In t
he physical layer of the I
2
C protocol, 10 bit I
2
C addresses are preceded by the five bit code, 11110. The oscilloscope
does not include these five bits in address readouts.
MDO3000 Series Oscilloscopes User Manual 71