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RS-422/485 serial port in RS-485 mode
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
1
Data +
2
Data -
3
Not used
4
+12 VDC (0.5A)
5
Ground
June 11, 2012
Pin
Function
6
TX 120 ohm terminating resistor
7
Not used
8
Not used
9
Reserved (no connection)
Version 1.6.4b.1
NION Hardware Manual
83
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