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CTA88H-000-SS Datasheet(PDF) 4 Page - Radiometrix Ltd |
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CTA88H-000-SS Datasheet(HTML) 4 Page - Radiometrix Ltd |
4 / 6 page Radiometrix Ltd CTA88 page 4 Operating modes Device operation is set up by a 3 bit word, on the C0-C2 inputs. TX / Encoder modes 000 Device is inactive 001 Send single burst, once only (on reset, and on each C0 low/high transition) 010 Send continuously 011 Send single burst on any change of Data input word 100 Send continuously while any Data input pin is high 101 Send a burst on average every 1.75 seconds. A P/N sequence generates a delay of 1 - 2.5s between bursts 110 Serial mode (see notes) 111 Transmitter test. Send a constant 250Hz squarewave (C0=H, C1=H, C2=H) RX / Decoder modes 000 Local test. Data output word equals Address input word 001 Output last data received (150mS timeout) 010 Output last data (3 second timeout: see notes) 011 Hold last data received 100 D0-3 'set' corresponding bit, D4 resets D0, D5 resets D1 .. and so on 101 A '1' on any bit toggles the state of the corresponding output pin 110 Serial (see notes) 111 Link test. Data word outputs most recently received burst address 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 high), receiver in 001. Outputs remain high for as long as the button is held down. This is the mode one would choose to control (for instance) a pan/tilt head (D0= slew left, D1 = slew right, etc) 3. Controlling four lights: Use transmit mode 100 (send while high) or 011 (send on change), with the receiver in mode 100. This gives four outputs (D0-D3), each set by one transmitter input (D0-D3) and reset by another (D4-D7) 4. Monitoring infrequent events (such as door open/shut): Use transmitter in periodic transmit (101, to keep channel occupancy and power usage low), and receiver on 010 (3 second timeout), 011 (hold last burst) or 110 (serial data output, to a PC or data logging device). In this mode the transmit duty cycle is less than 10% on average, and the variable delay between bursts permits same channel operation of several CTA88 links with minimum transmit collisions 5. Send burst on trigger event: Set transmitter to mode 000 (off) and use C0 line high as a 'strobe' line. A pulse between 100uS and 25mS with initiate a single transmission. This gives an idea of the usable combinations, but with a little imagination others will be found |
Similar Part No. - CTA88H-000-SS |
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Similar Description - CTA88H-000-SS |
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