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POLARITY: Set the signal polarity.
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Normally, the positive polarity is used in RS232 protocol. The high level and low
level stands for logic 1 and 0 respectively. Some users might use negative polarity,
which is that the high level and low level stands for 0 and 1 respectively. Therefore,
the design is optimized to meet demands from different users.
Choose the POLARITY option key, and the polarity selection list will pop up. Press
the POLARITY option key again to switch between positive polarity and negative
polarity. The Multi-purpose can also be used.
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BIT SEQUENCE: Set the data bit sequence
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Normally, the lower bit is transmitted first in RS 232 communication. For example:
if bit [7:0] is transmitted, the bit [0] will be transmitted firstly, and bit [7] transmitted
last. Considering that users probably use MSB, that is, bit [7] is firstly. The
transmitting methods can be set by users.
Select the Bit Sequence option key, and the bit sequence selection list will pop up.
Press the bit sequence again to switch between LSB and MSB. The Multi-purpose
knob can also be used.
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BAUD RATE: Set the transmitting baud rate.
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There are no clock signals for asynchronous serial communication. In order to
analyse the data, the two communication parties need to agree on the baud rate.
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Press the BAUD RATE option key, and the baud rate selection list pops up. Press
the BAUD RATE key again to switch between different baud rates. The available
baud rates are: 2400bps, 4800bps, 9600bps, 19200bps, 38400bps, 57600bps,
115200bps, and customized. The customized baud rate can be set from 1 to
5000000 (5 million).
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After selecting the customized baud rate, the customized value can be adjusted
using the Multi-purpose control. Press the corresponding baud rate display button
to increase the baud rate digit being controlled in order to quickly set to the desired
baud rate.
•
It is recommended that the interface length should be less than 20m and with speed
below 1Mbps. Outside of these ranges and the communication can be unreliable.
•
If a more detailed communication analysis is needed, the protocol decoding
function can be used. Oscilloscopes will capture the continuous communication
data for you when using this function. The communication contents can be shown
on screen or in the event list.
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BUS SETTING: Press the PRESS SETTING option key to enter the decoding bus
setting.
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BUS STATUS: Press the BUS STATUS option key, and the bus control selection list
pops up. The decoding function can be open or closed. The Multi-purpose knob can
also be used.
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DISPLAY FORMAT: Press the DISPLAY FORMAT option key, and four kinds of
display methods can be used: hexadecimal, decimal, and binary, and ASCII. The
Multi-purpose control can also be used.
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EVENT LIST: Press the EVENT LIST option key, and the decoding events can be
open or closed. The Multi-purpose control can also be used.
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PSEUDO SQUARE WAVE: Press the PSEUDO SQUARE WAVE option key, and
the pseudo square wave function can be opened and closed. The Multi-purpose
control can also be used. The pseudo square wave displays 0/1 collected by
the oscilloscope. The function can display logic 0 and 1 on the screen under the
condition that the input waveform is severely distorted.
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