T/R- (transfer-) to opposite side’s RXD- (receive-),
RXD+(receive+) to opposite side’s TXD+(transfer+), RXD-
(receive-) to opposite side’s (transfer-).
Communication mode supported:
① Point to point / Four line full duplex
② Point to multi-point / four line full duplex
③ Point to point / two line half duplex
④ Point to multi-point / two line half duplex
Note: to avoid signal reflections and interference, a matched
termination resistor (120Ω，1/4W) is required to wired at the
terminal of the line according to particular situation
Please be noted: this converter is port-powered, so normally
external power supply is not required. If you need it as your case
may be, the pin of VCC allows you to connect a 9V external power
supply to it.
V. Communication Wiring Diagrams
RS-232 TO RS-422 Conversion
VI. Troubleshooting
1. communication failure
A. Check to see if RS-232 interface connection is correct
B. Check to see if RS-485 output interface wiring is correct
C. check to see if the wired terminal board is connected well
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