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Using the Click 421
The Click 421 serial to Bluetooth radio converts half-duplex two-wire RS-232 and 485 communication to Bluetooth
and vice versa. Use this device in a cabinet to transfer data from a sensor to your computer via a wireless
Bluetooth connection.
Physical Features
The Click 421 has several communication ports, plus features for configuration.
Bluetooth
T-Bus
Connector
RS-232
Connector
Antenna
Connector
LED Indicators
Mode
Switch
RS-232 Connector
RS-485 Connector
TOP
FRONT
Communication Ports
The back of the Click 421 features a 5-position connector that plugs into a T-bus connector and provides power and
RS-485 communication to the device. It also passes that RS-485 communication to all other devices on the T-bus.
The top of the device has two pluggable screw terminal blocks. The first block features -485, +485 and two
ground screw terminals for wiring RS-485 communication. (It will not be necessary, however, to wire RS-485
through the screw terminal block if the device is connected to a T-bus with uninterrupted RS-485 communication.)
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