Acquire the Signal
For example, an RS-232 signal (after the start bit) might be high, high, high, low, high, low, low, and high. Since the RS-232 protocol
uses high for zero and low for one, this value would be 0001 0110.
Since the decode displays the MSB
fi
rst, the oscilloscope reverses the order of the bits and displays 0110 1000. If the bus display is
set to hex, the value displays as 68. If the bus display is set to ASCII, the value displays as h.
RS-232
If you de
fi
ned an end-of-packet character to
use for RS-232 decoding, the stream of bytes
will be displayed as packets.
When decoding an RS-232 bus in ASCII mode,
a large dot indicates that the value represents
a character outside the printable ASCII range.
Setting Up Digital Channels
Use front-panel buttons and knobs to set up your instrument to acquire signals using the digital channels.
110
Tektronix 4000 Series Oscilloscopes User Manual
Summary of Contents for 4000 Series
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Page 53: ...Installation 2 Power off your oscilloscope Tektronix 4000 Series Oscilloscopes User Manual 35 ...
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