Should the Alarm System Master Code be set to '1234', you'll need to change it.
The default Master Code in the Olarm APP is also '1234', it must be updated to something different to ensure it doesn't match the default app code.
Plug the 4-pin side of the reversible peripheral cable to the Serial port on your Paradox MG/SP + Plus Alarm Panel.
Cut and strip the 5-pin side of the cable. Wire this end of the cable into the terminals found on the back of the Olarm MAX.
Red to + (Positive)
Black to GND
Yellow to SERIAL 1
Green to SERIAL 2
Once you have powered up your Paradox MG/SP + Plus alarm system, and have added it to the Olarm APP. You will be prompted to enter the Master/User code in the app.