DoorKing 1820 Telephone Intercom - Manual (Page 26)

2.4 Circuit Board Connector Locations
Master Code
Switch
RJ45 Jacks
Use with 1884 (Call Down)
Line Interface Boards
1820 Systems Only
10-Pin Ribbon Connector
Use with 1882 and 1982
(Standard) Relay Boards
1816 Systems only
Terminals 1-10
Decoder Board Connection
1816 Systems only
Main Terminals 11-24
ES OUT CO OUT
Page 26 1820-065-E-12-11