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RS-232 Logic and Voltage Levels |
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Data Circuits |
Control Circuits |
Voltage |
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0 (Space) |
Asserted |
+3 to +15 V |
|
1 (Mark) |
Deasserted |
−15 to −3 V |
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Pin Functions for RS-232 |
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TXD (pin 3) |
Serial Data Output |
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RXD (pin 2) |
Serial Data Input |
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GND (pin 5) |
Ground |
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Specifications |
RS-232 |
RS-485 |
|
Mode of Operation |
Single-Ended |
Differential |
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Number of Drivers / Receivers on One Line |
1 Driver |
32 Drivers* |
|
Maximum Cable Length |
50 ft (2500 pF) |
4000 ft |
|
Maximum Data Rate (at max cable length) |
160 kbits/s (can be up to 1Mbit/s) |
10 Mbit/s |
