3 = only for inhouse use of the manufactorer / do not connect anything!
4 = RS 232 interface (male) for modem or serial interface (COMx) connection.
The RS 232-host interface (modem or COMx - connection) and the RS 485-host interface (8)
can not be operated at the same time.
5 = Ethernet interface
RJ45 CAT 5 (female), 10/100 Mbit
6 = Plug SK4 for plug-in connector of foil keypad (10 pole)
The foil keypad has a 10 pole and a 3 pole (see 16) contact tounge.
The 10 pole contact tounge is to be put in the plug SK4 and barred. In ex-works condition this connection does
7 = DIP-Switches
With the 4 DIP-Switches, the terminating resistors of the RS 485 host interface (see 8) can be placed. Note: All
4 switches must be always in the same position.
all 4 ON
all 4 OFF
The terminating resistors must be placed in each first and in each last device of a line. The device does not
mandatorily need to be a TRS 33xx (see examples on previous page).
Terminating resistors active
Terminating resistors not active
Installation and Operating Instructions TRS 33xx