Concept
RS-485 Power Adapter Ports, Terminals, and Switch
The RS-485 Power Adapter is equipped with dual RJ45 ports, a 4-position removable screw terminal block, and a 2-pole slide switch.
The adapter's two RJ45 ports are marked:
IN PORT
OUT PORT
You use the IN PORT to connect the adapter to an RP or MP controller RS-485 Com (RJ45) port when you want to convert the RJ45 interface to/from screw terminals.
You use both the IN PORT and OUT PORT to connect the adapter to an RS-485 based network with RJ45 interface, such as Room Bus or Sensor Bus, when you want to connect an external 24 VDC power supply to the bus.
The 4-position removable screw terminal block allows connection either to an RS-485 based network such as a Modbus RTU network or to an external 24 VDC power supply.
The 2-pole slide switch has two positions, which are marked:
24 VDC EXT
24 VDC INT
The switch allows the choice to inject 24 VDC to an RS-485 bus, thereby powering devices connected to the bus. 24 VDC can either be supplied via the adapter from an external 24 VDC power supply or from the RP or MP controller RS-485 Com port.
You move the switch to the EXT (External) position when you want to use an external 24 VDC power supply.
It is recommended to move the slide switch on the adapter to the EXT (External) position before connecting the external 24 VDC power supply.
You move the switch to the INT (Internal) position when you want to use the RP or MP controller to supply 24 VDC (3 W or 2 W).
RS-485 Adapters
RS-485 Power Adapter
Convert a BACnet/IP Controller RS-485 Interface
Enable Injection of 24 VDC from an External Power Supply to an RS-485 Bus