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GD-04 DAVID 1 MKS51202_OS1*
The GD-04 “David” GSM communicator
User manual
The GD-04 module got its name from David, a biblical king who outsmarted Goliath, a giant. In our
case, Goliath is meant to be the GSM network. We hope that the skills of your tiny David will help you
manage the giant.
1. Basic description
SIM
Bus connector
Battery connection
LED indicator
RESET jumper
GSM antenna
Tabs
SIM card
Output fuses
1.1. David provides:
2 output contacts of power relays X and Y (each allows up to 5A/250V)
4 input terminals A to D for SMS reporting (the inputs react to a connection or disconnection
to or from a common GND terminal)
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  • I can’t work out how to register new phone numbers to our David garage gate system - the only resident who knew how has moved away. It works fine with my phone which is registered but some people who have just moving in would like to add their numbers . Any help would be greatly appreciated! Submitted on 23-5-2020 at 15:54

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