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RF Communication between Turning Technologies Keypads and Receivers
Turning Technologies RF devices are commercial off-the-shelf (COTS) and operate at frequencies in the
2.4GHz (2.4 gigahertz) ISM band. They are fixed frequency devices and operate at a single relatively narrowband frequency or “channel”. Each of the 82 available channels is 1MHz in width.
Transmit power levels for the Turning Technologies devices are very low – less than +4dBm (2.5mW). This
signal is estimated to travel only 400 feet. Receive sensitivity is -85dBm max. Bit transfer rate for the Turning
Technologies devices is 1Mbps. Packets of information are sent from each ResponseCard® keypad to the
receiver. These packets include only a device ID and response selection. The ResponseCard NXT device also
includes a user ID if that field is populated on the device. With overhead, the total packet duration is less than
265µs.
Communication is only between the ResponseCards and the RF receivers. The USB based receiver then
communicates the response data directly to the Turning Technologies software products. The USB receiver is
designed to only communicate to Turning Technology software products through a proprietary licensing
system. No network transmission will occur from the USB device.
Flow Diagram of Communication:
Standard Responses
1. Response sent to receiver – 10 bytes
Receiver
2. Acknowledgment sent to keypad – 7 bytes
ResponseCard
Keypad
Keypads
RCRF-01
RCRF-02
RCRF-03
RCXR-01
RCXR-02
RCXR-03
Receiver
RRRF-01
RRRF-02
RRRF-03*
RRRF-04
RRLR-01
RCAW-01
Extended Responses
1. Response sent to receiver – 10 bytes
Receiver
2. Special acknowledgment sent to keypad – 7 bytes ResponseCard
3. Extended Response sent to receiver – 28 bytes
Receiver
RRRF-01
RRRF-02
RRRF-03*
RRRF-04
4. Acknowledgment sent to keypad – 7 bytes
Keypad
Keypads
RCXR-01
RCXR-02
RCXR-03
RRLR-01
* RRRF-03 is the only receiver with built in storage capacity.