Your Intercom has 2x Outputs which are used to trigger/switch a connected device. Technically, NO1/COM is incorrect......... Output 1 will be NO1/COM/NC1 & Output 2 NO2/COM/NC2, these both function the same, described below.
Definitions:
NO - (Normally Open) which means the "relay" contact is Normally an Open Circuit. When triggered the Contacts Close & complete the Circuit.
NC - (Normally Closed) which means the "relay" contact is Normally a Closed Circuit. When triggered the Contacts Open & breaks the Circuit.
COM - (Common) depending of the relays function, Common is the source in which the Contact Switches on or off.
So in your case, because you have stated NO1/COM as being the 2 Wires connecting your Door Lock, i can tell you that:
1. Your Door Lock/Strike has a constant DC+ Power Feed
2. The Ground/DC- feed from your Door Lock/Strike is the wire Connected to the NO terminal of your Door Station
3. The wire connected to the COM terminal of your Door Station is connected to Ground/DC-
So when you trigger the Unlock Button, the Relay Contacts "Close" & completes the Ground Circuit for the Lock. therefore powers the Lock to Open.
This Mode is Known as "Fail Secure" or "Power to Open" (PTO). Benefits: the lock will remain locked in a power failure.
NC (Normally Closed) example, operates in the same manner, except the Relay Contacts are Closed & the Circuit is Complete, providing Power to the Lock. Pressing the Unlock Button, Opens the Relay Contacts ................. breaking the Circuit & Opens the Lock. This Mode is known as "Fail Safe" or "Power to Lock" (PTL). Benefits: the Lock will Open/Unlock in a Power Failure (emergency/fire doors etc).
Your Intercom is a Modular Type, which means you can inter-connect multiple Door Stations, Room Stations etc, unfortunately the Outputs are also inter-connected between the Modules, therefore Output 1 on your Room Station, Keypad, Card Reader etc are all connected to Output 1 of the Door Station .............................. Unlocks the Lock.
If your Intercom is the "2-Wire" version (not LAN type), i assume you could wire the Lock directly to the Indoor Station Output, as long as you are able to run cabling between the two? ................. also consider limitations such as Volt Drop