CTA28 App. boards
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The CTA88 chip is a simple encoder/decoder for use with ISM band telemetry modules. It permits a simple, one way wireless link to be established, for simple remote control applications, with a minimum of effort and no customer software input. These tx and rx application boards are designed to allow easy evaluation of the CTA88 device in elementary jobs. They provide a simple 2 channel implementations, using either LMT/LMR or BiM footprint radio modules ■ 8 bit address and 2 bit data select switches ■ 2 relays to control mains powered devices rated up to 8A, 250VAC/30VDC ■ Visual indication of valid code received and active relays ■ RF module range testing ■ Push button for momentary control of relays ■ Momentary, Latched outputs ■ Dynamic relay state changes ■ Setup is simple as Plug-and-Play ■ RF Remote Control Demonstration Kit Contents The CTA28 Application kit is supplied with the following contents: 2 CTA88-000-DIL 1 Radiometrix T ransmitter module (ordered separately) 1 Radiometrix Receiver module (ordered separately) 2 1/4-wavelength monopole or helical antennas (ordered separately) 2 Jumpers 1 CTA88 data sheet 1 CTA28 Application board manual 1 Data sheet of Radio module ordered ■ External power supply or 12V DC power adaptor Radiometrix Ltd CTA28 Demo board page 1

Channels connected on the CTA chip are zero and four (for compatibility with rx mode 100, and serial operation) Common features: Radiometrix Ltd CTA28 Demo board page 2

The TX encoder board has 4 jumpers and 2 DIP switches. The jumpers are used to select the number of operating modes featured in the board while the 4 way and 8 way DIP switches are used for frequency channels selection and address selection respectively. Contact Contact Input Input Figure 2: CTA28 TX application board PCB (top view) Assumed the board is held "long side horizontal" with the RF connector and DIP switches at the top Jumper. Name Function Position Selects which power supply is fed to the user inputs busbar (Only EVER fit one jumper on this header) Low current / always...

TX DIP switches The TX encoder board has 4 jumpers and 2 DIPswitches. The jumpers are used to select the number of operating modes featured in the board while the 4 way and 8 way DIP switches are used for frequency channels selection and address selection respectively. Radiometrix Ltd CTA28 Demo board page 4

Radiometrix Ltd CTA28 Demo board page 5

Which modes to use? The CTA88 have a variety of operating modes. These are better understood by relating them to different applications: 1. Wire replacment:. Operate transmitter in mode 010 (continuous: allows the STB output to be used as a 'good link' indicator) and receiver in mode 001. If receiver operates in latched (011) mode then 'chattering' of the output is reduced (at extreme range, or with interferers present), but the link is no longer fail safe Latched mode is also compatible with send on change (011) 2. Momentary push buttons: Transmitter in mode 100 (send while any input is...

The long timeout is usable with the randomised periodic transmission mode (101), as the 3 second timeout is longer than the longest delay between transmissions in this mode. Versions of the chip can be supplied with this period extended to suit customer requirements CTA28/CTA88 board: External input operation LK1A will link the COM to the system ground. Radiometrix Ltd CTA28 Demo board page 7

Figure 4: CTA28 Encoder Transmitter Schematics

Figure 5: CTA28 Decoder Receiver Schematics

Ordering Information Radiometrix Ltd CTA28 Demo board page 10

Copyright notice This product data sheet is the original work and copyrighted property of Radiometrix Ltd. Reproduction in whole or in part must give clear acknowledgement to the copyright owner. Limitation of liability The information furnished by Radiometrix Ltd is believed to be accurate and reliable. Radiometrix Ltd reserves the right to make changes or improvements in the design, specification or manufacture of its subassembly products without notice. Radiometrix Ltd does not assume any liability arising from the application or use of any product or circuit described herein, nor for...