I would avoid the 50Hz thread that Anand referenced - it's only likely to confuse things.
The ONLY time that the 50Hz vs 60Hz issue is a problem is when the electrical system is 3 phase and you need to control devices on phases other than the phase into which the PSC-05 is plugged. The first signal burst of 120kHz is at ZC, the second is at ZC+PERIOD/6 and the third is at ZC+PERIOD/3 where PERIOD=1/60 or 1/50 depending on the mains frequency.
The PCS-05 only sees the ZC of the phase into which it is plugged. Similarly, receiver devices only see the ZC of their specific phase. Whatever is controlling the PCS-05 must calculate the other two ZCs and control the timing according to the mains frequency.
If all of the devices to be controlled are on the same phase as the PSC-05, it is best to send only a single burst per half-cycle - sending to all three phases tends to sap the PSC-05 power supply.
EDIT: A final point. X-10 showing an inverter on the X-10 gate signal to the PCS-05 is probably to reduce the current load on the PIC (or other MCU) drive pin.
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