Tenma 72-14520 Instructions Manual page 17

• Press the NEXT PAGE option key to enter the following settings:
• VERTICAL POSITION: Press the VERTICAL POSITION option key and rotate the
Multi-purpose control to adjust the position of decoding data on the screen.
• EVENT LIST CHECK: When the Oscilloscope is in the state of decoding, the RUN/
STOP button is green. At this moment, press the RUN/STOP and the Oscilloscope
will stop refreshing waveform and the button will turn red. The collected data will be
stored in the Oscilloscope. The menu will display decoding data selection list, the
button can display the captured times of transmission signals and the number the
selected data.
• The selected decoding data will be highlighted green. The Multi-purpose control can
select any collected data.
Input signals are shown in figure below: data width is 8 bits, data bit is 0*55, and stop bit
is 1 bit, even parity. The trigger condition is: data, negative polarity, the bit sequence is
LSB, the baud rate is 115200bps.
The bus settings are: Bus is open, the display format is ASCII, event list open.
I2C Protocol Trigger and Decode (Optional)
• I2C protocol is usually used to connect micro-controller and its peripheral
equipment, a widely used protocol in the field of microelectronics communication
control. The bus protocol uses two wires to transmit.
• One is serial data cable SDA, the other is serial clock cable.
I2C Start Trigger
• Press the DECODE button. Then press the TYPE option key to open protocol type
list. Rotate Multi-purpose control to select the SPI protocol mode. Press Multi-
purpose control to start the SPI protocol mode.
• SCL: Select clock source
Press this option key and the present clock source font becomes green. Press the
SCL button again to switch any channel among CH1-CH4 as clock source. The
corresponding logic level can be adjusted when the corresponding signal source
is selected. The way of adjusting is the same with that of trigger level. To avoid the
effect of signal noise, it is suggested that the comparative level should be set in the
waveform centre area to obtain accurate results.
17