RS-232

RS-232 Logic and Voltage Levels

Data Circuits

Control Circuits

Voltage

0 (Space)

Asserted

+3 to +15 V

1 (Mark)

Deasserted

−15 to −3 V

Specifications

RS-232

RS-485

Mode of Operation

Single-Ended

Differential

Number of Drivers / Receivers on One Line

1 Driver
1 Receiver

32 Drivers*
32 Receivers

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