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KTX2-433 数据表(PDF) 3 Page - Radiometrix Ltd |
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KTX2-433 数据表(HTML) 3 Page - Radiometrix Ltd |
3 / 8 page Radiometrix Ltd, KTX2 Data Sheet page 3 Notes on the KTX2: 1. The Module will transmit if any of the function lines (S0 – S3) is activated (high). 2. Single message time is typically 150ms. 3. Whilst S0 – S3 are all deactivated (low) standby current consumption is <1uA. 4. The Module will transmit the same message (with the same hop-code) repeatedly whilst any of the function lines are held active high, until power-saving time-out occurs after approx. 30s. 5. When the power-saving timeout occurs, current consumption will be <350uA, until all function line(s) are released again. 6. Whilst a function line is held high, if another function line is taken high then the function code in the message changes to reflect the new state of the function lines and the hop-code is also changed – as if the user had released all function lines and activated the new combination. 7. Releasing individual function lines (whilst at least one function line remains high) has no effect on the transmitted message. 8. The supply monitoring status bit is set when module supply drops below 3.8V (approx.) and resets when supply falls even further – below 2.2V (approx.) – but note that this is less than the minimum supply recommended for use with KTX2. Description of the KTX/KRX code hopping system: Every time a function code is activated causing KTX to transmit, a hop-code is generated. The hop-code is an encryption based upon a Manufacturer code and the module ESN (unique to each module). An encryption algorithm uses these two variables to generate the hop-code, which will change for every new transmission. Note that the data itself (i.e. the function code) is not encrypted, as it is the identity and status of the sender that is used to safeguard operation of the system. At the KRX receiver-decoder, the hop-code can only be decrypted with the correct key. The key is derived from the manufacturer code and the KTX serial number. The manufacturer code is not transmitted: it is pre-programmed into the decoder. Because the hop-code is changed for every new transmission the receiver decoder must be synchronised to the transmitter encoder. This is achieved by “learning” the transmitter to the receiver during which the serial number and synchronisation data is stored in the receiver-decoder. Transmissions received from all KTX modules are decoded, but not acted upon unless the serial number has been learned first and the decoder is synchronised to the encoder. If the Radiometrix KRX decoder loses synchronisation with the transmitter (e.g. repeated transmitter activation whilst out of range) then the KTX module must be activated twice before the decoder will allow the control to be processed, but only if the KTX module is within a forward window of +32768 activations. This mechanism prevents “code-grabbers” from breaking the security of the system by recording and re- broadcasting old codes. Additionally, in the KRX decoder a window exists allowing up to 14 transmissions to occur whilst the transmitter is out of range before two valid sequential transmissions are required to use the system. In practice a user may not notice the latter, since human reaction to an unsuccessful attempt is simply to “press the button again”. |
类似零件编号 - KTX2-433 |
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类似说明 - KTX2-433 |
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