Satel ACU-280 - Electronics Board; Terminals

6 ACU-280 SATEL
3 Electronics board
Fig. 1. Controller electronics board.
DIP-switches.
LED indicating the status of communication with the control panel:
ON – no communication with the control panel,
flashing – communication with the control panel OK.
tamper switch.
RS-232 port (TTL standard).
3.1 Terminals
+12V - power input.
COM - common ground.
CKM - keypad bus clock.
DTM - keypad bus data.
CKE - expander bus clock.
DTE - expander bus data.
A RS485 B - RS-485 bus.