ABB RS485 - Mounting; Technical Data

RS485  RS485 Modbus adapter - 11
57 mm
Fixing screw
TX – RX led’s
48 mm
35 mm
Resistor
Termination switch
Extra depth to
the controller
max. 10 mm
Screwed terminal for
bus cable connection
4.3 Mounting
The Modbus adapter is specially shaped to fit the controller case and to plug into its
dedicated connectors without any other additional fixation part than just a screw.
3D view
3D view
inserted in back plate
Controller optical
transceiver
Controller power
supply connector
4.4 Technical data
 Operating ambient temperature: -20 to +70 °C
 Number of nodes (Tx drive): 32 max
 Rx loading: receiver impedance is 1 unit load per RS485 Modbus adapter
 Size of the Link: 247 stations including repeaters (31 stations and 1 repeater per
segment)
 Medium: Shielded, twisted pair RS485 cable (Belden 9841 typical)
 Maximum Bus Length: 1200 m
 Topology: Multi-drop
 Serial Communication Type: Asynchronous, 2 wires half Duplex
 Baud rate: 110, 300, 600, 1200, 2400, 4800, 9600, 19200, 38400, 57600 bauds
selectable by the user (can be adjusted through the controller menus)
 Termination resistor: built in, selectable by a switch. 120 ohms resistor is needed
at both end of the line and must be switched or not depending on the location in
the Modbus network topology.