HD26LS32

Rev.2.00, Jul.16.2004, page 11 of 14

RS-442A Interface Standard Applications

Figure 9 shows sample operation waveforms at various points with 1200 m and 12 m cable lengths.

1. Unidirectional Transmission (1 : 1 Configuration)

Receiver

Data

output

F

D

E

Driver

B

C

A

Data

input

Figure 8 1 : 1 Unidirectional Transmission

: 1200 m

: 100 kHz

Line

Frequency

: 5

µs/div

: 2 V/div

H

V

: 50%

: 100

Ω

Duty

: 12 m

: 10 MHz

Line

Frequency

: 50 ns/div

: 2 V/div

H

V

: 50%

: 100

Ω

Duty

A

GND

C

GND

B

GND

D

GND

F

GND

E

GND

A

GND

C

GND

B

GND

D

GND

F

GND

E

GND

Figure 9 Sample Transmission Waveforms