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X-10 protocol for the Marmitek XM10 OEM Controller
Opto-Coupled 50 Hz reference output
Transmissions are to be synchronised to the zero crossing point of the AC power line and should be as
close to true zero crossing as possible. The two-way interface are designed to be interfaced to other
microprocessor circuitry which outputs X-10 codes synchronised to the zero crossing point of the AC
power line. It is therefore necessary to provide a zero crossing reference for the controller microprocessor.
It is likely that this microprocessor will have its own .isolated. power supply. It is necessary to maintain
this isolation, therefore the trigger circuit normally used in X-10 controllers is not desirable as this would
reference the controller power supply to the AC power line. It is also not desirable to take the trigger from
the secondary side of the power supply transformer as some phase shift is likely to occur. It is therefore
necessary to provide an opto-coupled 50 Hz reference.
An opto-coupled 50 Hz square wave is provided at the output of the two-way interface. X-10 codes
generated by the controller are to be synchronised to this zero crossing reference. The X-10 code
envelope generate by the controller is applied to the two-way interface which modulates the envelope with
120 kHz, and capacitively couples it to the AC power line.
Opto-Couple Signal Imput
The input signal required from the O.E.M product is the signal .envelope. of the X-10 code format, i.e.
High for 1 ms. coincident with zero crossing represents a binary .1. and gates the 120 kHz, oscillator
through to the output drive circuit thus transmitting 120 kHz, onto the AC power line for 1ms.
Low for 1 ms. coincident with the zero crossing point represents a binary .0. and turns the 120 kHz
oscillator/output circuit off for the duration of the 1 ms input.
Opto-Coupled Signal Output
The .X-10 received. output from the two-way interface coincides with the second half of each X-10
transmission.
This output is the envelope of the bursts of 120 kHz received. Only the envelope corresponding
to the first burst of each group of 3 bursts is available at the output of the
two-way interface. See Figures 3, 4 and 5.
Start
Code
House
Code
Function
Code
Start
Code
House
Code
Function
Code
Start
Code
House
Code
Function
Code
Figure 3: X-10 code received from the AC power line
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