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Signal levels
These examples show the transmission of a single ASCII character 2C (0010 1100) which
is a Comma, so that you can see the voltages in RS485 and RS232 systems.
Typical UART output
Idle
RS485 data line levels 8n1
A(+)
Idle
B(-)
RS232 data line levels 8n1
+7.5V
0V
Idle
-7.5V
10
1
2
4
Start 0
0
1
LSB
Start
0
0
1
LSB
LSB
0
0
1
Start
8
10
20 40 80
1
0
1
0
0
MSB
+5V
1
0
1
0
0V
MSB
MSB
1
0
1
0
Stop
A(+)
0
Stop
B(-)
0
Stop
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