Watson-Marlow Qdos30 - Manual (Page 18)

Watson-Marlow qdos30 PROFIBUS Pump User Manual 18
11.2 Pin assignments at the pump
Pin No. Signal Function
1 VP +5V supply for terminating resistors
2 RxD/TxD-N Data line minus (A-line)
3 DGND Data ground
4 RxD/TxD-P Data line plus (B-line)
5 Shield Ground connection
Note: If the pump is the last bus device connected to the PROFIBUS cable it must be
terminated using terminating resistor (PROFIBUS standard EN 50170). To maintain
ingress protection the resistor must be IP66 rated.