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RS-232RS-422 INTERFACE CONVERTER
11
Figures 3-3a and 3-3b show some typical synchronous applications.
Figure 3-3. Synchronous Applications.
Applications involving asynchronous devices are also possible. Figure 3-4 illustrates a popular
asynchronous setup, while Figure 3-5 shows the cabling involved.
Figure 3-4. RS-422 Asynchronous Application.
PC OR OTHER
DTE DEVICE
RS-232/RS-422
INTERFACE
CONVERTER
DIP-SHUNT
SETTINGS:
DCE DTE
(GROUND
OPTIONAL)
RS-422
DEVICE
22 (T+)
4 (T-)
24 (R+)
6 (R-)
19 (FRAME
GND)
R+
R-
T+
T-
GND
DB25
STRAIGHT
CABLE
RS-232 MODEM
OR MODEM
ELIMINATOR
PC
RS-232
TERMINAL
RS-232 MODEM
OR MODEM
ELIMINATOR
INTERFACE
CONVERTER
INTERFACE
CONVERTER
DIP SHUNT SETTINGS
RS-232 RS-422
DTE DCE
DIP SHUNT SETTINGS
RS-232 RS-422
DCE DTE