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For RS-485 applications the serial port is configured for half-duplex operation. A single data pair is provided for transmit (Data+) and receive (Data-).
Additionally, there is a 120 Ohm terminating resistor provided for applications that require an EOL termination. The termination is optional and is accessible by connecting the terminating pin (TX Terminator) to the positive data (Data+) pin.
Power (+12VDC) is provided on pin 4 and is referenced to ground, pin 5. The power pin is protected by a self-resetting fuse and is limited to 0.5A, max.
Pin |
Function |
Pin |
Function |
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1 |
Data + |
6 |
TX 120 ohm terminating resistor |
2 |
Data - |
7 |
Not used |
3 |
Not used |
8 |
Not used |
4 |
+12 VDC (0.5A) |
9 |
Reserved (no connection) |
5 |
Ground |
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See also |