Recommended Circuit Connections - Epson C824431 Mode D'emploi

RECOMMENDED CIRCUIT CONNECTIONS

Recommended line driver and line receiver for RS-232D
signal level settings. (As viewed from the host computer.)
Figure 4. RS-232D
MC 1488L, 75188 or equivalent
MC 1489L, 75189 or equivalent
Recommended line interface circuit for 20mA Current Loop
signal level settings. (As viewed from the host computer.)
Figure 5. Current Loop
Photo Coupler
Photo Coupler
Note
The value of "R" should be selected so that the loop current
is set between 10 and 20 mA. The "+V" should be 3V to 24V.
Line Driver
Line Receiver
+ V
*
R
V *
+
R
21
Serial Interface Card
Serial Interface Card
TTY-RXD
TTY-RXD return
TTY-TXD
TTY-TXD return