On an RS-422/485 port, connect the TXD+ signal to RXD+ signal, and the TXD- signal to the RXD- signal.
ROLINE USB RS232 DB25 CONVERTER DRIVER WINDOWS 7 SERIAL
*It is not recommended to use the RJ-50 connector by itself to perform a loopback test due to the small separation between pins. If you use a RJ-50 to DB-9 serial cable (Part Number 182845-XX), a loopback test can be performed using the pins for a DB-9 connector. Refer to the pins below based on your connector type. On an RS-232 port, connect the transmit (TXD) signal to the receive (RXD) signal. For more details on NI serial hardware pinouts, refer to the Serial Quick Reference Guide. Note: The pin diagrams provided for this tutorial are for the female connector. RS-422/485) and the type of serial connector you have.
Identify what serial communication protocol you are using (RS-232 vs. Refer to the sections below to properly connect your hardware.
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