User's Manual

Everex Communications, Inc
WC-21 User’s Manual:
WC-21 is a 2.4Ghz wireless digital I/O transceiver which is used in energy
management, building control, HVAC applications. It communicates with the
host and/or other WC-21 units in the unlicensed 2.4Ghz ISM band. It is powered
by a 24VAC power source. The unit consists of the following I/O functions:
1. Two 1A/30V relays: Relay connection can be normally open or normally
close.
2. Two thermistor inputs: Connected to 30K thermistor, the unit can provide
remote temperature reading.
3. Humidity sensor: The humidity sensor can provide accurate local relative
humidity reading.
4. Serial communication bus: Other serial peripheral devices can be
connected to the unit for providing expansion of the additional digital
inputs/outputs or other control function, for example, thermostat.
One of the important features of WC-21 is its mesh network, self-forming
and self-healing capability. Each WC-21 unit is a router which can relay
information and command to other WC-21s. If one of WC-21 in the network path
becomes non-functional, WC-21 can automatically seek other WC-21 to reform
the network connection.
Installation:
There are a 12 pin screw terminal and a 4 pin serial communication
connector. The 12 pin screw terminal provides connections to themistors for
temperature measurement and to other HVAC devices. The 4 pin connector
provides serial communication and 24VAC power to other serial device, such as
thermostat or modbus I/O expander. Please refer to the picture below for pin
assignment of each connector. WC-21 should be mounted high up on the wall to
provide maximum RF communication range.