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Click 421 Serial to Bluetooth
INSTALLATION QUICK START GUIDE
1
Mount the device
The Click 421 mounts over a T-bus for power and communication:
1
If the Click 421 was shipped with the T-bus connector attached, remove the connector
from the module.
2
Snap the connector onto the DIN rail by positioning it over the rail with the male connector
pointing to the right. Hook one arm over the edge of the DIN rail and press down on the
other arm until it snaps into place.
3
Connect the T-bus connector to the rest of the T-bus by sliding them together until you
hear them snap into place.
4
Mount the Click 421 onto the DIN rail: position it properly over the T-bus connector, hook
the lip over the lower edge of the DIN rail, and use a rocking motion to snap the module
into place.
If you are using a Click 200 surge protector with the Click 421, power and communication are provided to the Click 421
through the T-bus (see the Click 200 Quick Start Guide). If you don’t have a Click 200 surge protector, use the following steps
to wire power and communication into the Click 421:
1
Plug a T-bus 5-screw terminal block into the first T-bus connector.
2
Wire DC power (9–28 V) from the power supply into the first screw
terminal on the 5-screw terminal block; wire -DC into the second screw
terminal.
3
Connect RS-485 communication (+485, -485, and GND) to either the
remaining three screw terminals on the 5-screw terminal block or to the
screw terminals in the pluggable screw terminal block on the top of the
Click 421 (see labels for correct wiring).
The front of the Click 421 has one other communication port.
˽
DB-9 connector –
Connect a straight-through cable here for RS-232 communication.
3
Attach the antenna
2
Wire power and communication
The Click 421 has a reversed polarity SMA antenna connector. A whip antenna can be used inside the cabinet, though if it is
inside a metal cabinet, the range will be diminished. An external antenna can also be mounted on the exterior of the traffic
cabinet or up on a pole for maximum range. In that case, it is recommended you use a Click 250 wireless surge protector:
1
Connect the reversed polarity SMA connector of a coax cable to the Click 421 (antenna must be removed), and connect
the N connector to the nonbulkhead end of the Click 250.
2
Connect the N connector of another coax cable to the bulkhead end of the Click 250, and connect the other end of the
cable to the external antenna.
3
Attach a 12 AWG stranded copper grounding wire to the Click 250, then connect the grounding wire to earth ground.
Red (+DC)
Black (-DC)
White (+485)
Blue (-485)
Drain (GND)
