User`s manual

The Unit Connectors AXIS 2490 User’s Manual
34
The RS-485/422 port
A 4-wire RS-422/485 port (one TX pair and one combined RX/TX pair).
The RX port can be used for both RX and TX (controlled by RTS) and for half-duplex
RS-485.
The port can be used in any of these configurations:
• Full-duplex RS-422 (4-wire) or
• 4-wire RS-485 or
• Half-duplex RS-485 (2 wire)
The port is compliant with EIA-RS-485 up to 1843200 bps.
RS-485/422 Serial Port on screw terminal block
Pin Function
1 AC
2 AC
3 GND (Standard Ground)
4 GND100 Ohm (Connected to Gnd via 100 Ohm
resistor)
5 RX/TX -A
6 RX/TX +B
7 TX -
8 TX +