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BL118

BL118
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These simple application boards use firmware based on the BD118 remote control systems to implement a bidirectional control link. A system consists of a master board (which initiates communication burst cycles) and a slave (which responds to them). In hardware terms these boards are the same, but have different firmware loaded. A single relay output is provided on each board, controlled by a logic (or switch) input on the "opposite" board. This product only operates in one mode: the radio link operates continuously, and the output simply reflects the state of the input ("momentary" operation). The radio link uses a 4% duty cycle, 2 second burst cycle. The data format employed has an 8 bit address, which is set up on a DIP switch (master and slave addresses must be the same) LED indicators are provided for power, relay output state and "valid communication link established". Features ■ 8 bit address select switch ■ A relay to control mains powered devices rated up to 8A, 240VAC ■ Visual LED indication of communication status and relay state ■ Useful for RF module range testing ■ Logic or Switch input for momentary control of relay ■ Very low (1 mA) average current. 2 years operating life from D cells ■ Simple “plug-and-play” setup. No complex programming needed Applications ■ Security and Alarm systems ■ Emergency assistance call system ■ Status reporting and monitoring systems ■ RF Remote control systems ■ Industrial controls ■ HVAC controls ■ Simple On/Off switching ■ Long range telecontrol with Narrow Band FM radios Kit Contents The BL118 Application kit is supplied with the following contents: 1 BL118 Encoder/Decoder Master board 1 BL118 Encoder/Decoder Slave board 2 Radiometrix Transceiver module (ordered separately) 2 1/4-wavelength monopole or helical antennas Additional requirement ■ External power supply (12V and 5V version available)

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The term "BL118" actually refers to two different things: a 28 pin PIC programmed with bidirectional control code, and an applications board (equipped with a BIM radio, and a relay) that the BL118 chip can be used on. (There is actually nothing to prevent completely different firmware that complies with the pin allocations being used on the BL118 board) Common features and characteristics of the BL118 boards Operating temperature Radio modules

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The "blinking lights" on a BL118 look similar to a BD118, but the functions are actually very different (we cannot leave an LED constantly "on", or it's 2mA current drain will dominate the unit power consumption) The BL118 CPU All current BL118 systems (so far) share the same data burst structure and coding scheme. The bit coding is simple biphase, at approx 3600 bits per second. The burst is a 36mS long frame, incorporating 10mS of preamble, a framing /sync sequence, an 8 bit address, an 8 bit data word and a checksum. To date no BL118 uses any more than 1 bit of the data word, although in...

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Figure 2: BL118 Board Component Layout

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Ordering Information Note: For details relating to the radio module fitted on board, see relevant data sheet http://www.radiometrix.com/files/additional/nim2.pdf http://www.radiometrix.com/files/additional/bim1 h.pdf

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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...

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