Figure 2.35 Pin Connection Of Dpim - Samsung OFFICESERV 7100 Service Manual

Switch Detection Part
A visitor can call the person in the inside by pressing the switch on the door box.
The DPIM detects if this switch was pressed, with a photo coupler, and enters in the MCU
port 46(No. 15 pin). At this time, the MCU sends the data to the D-channel of the PCM
transfer chip(TP 3406, U5).
The system, which received this data, sends a signal to the port, which was already specified,
to enable the calling.
This signal for detecting the switch can consist of two lines because it is sent through the
center tap of the matching trans(T5692), and even though the power of +5 V is given to the
trans, the trans is not damaged.
+12 V Generating Part
The DPIM uses the step up DC converter(LT1109, U11) that generates +12 V in the simple
surrounding circuit by the +5 V power being entered. LT1109-12 displays +12 V 60 mA by
the input of +5 V.
The 33 uH(L2) inductor is for generating the switching, and the 47 uF/35 V(C7) capacitor
is for the load of the switch, and the 33 uH(L1) inductor of the output end is for decreasing
the switching ripple noise. Also, the poly switch of the +12 V output end is for prohibiting
the overcurrent from flowing when the +12 V line, which is connected to the door box, is
shortened.
Pin Connector
Door Lock
Modular pin(6P6C) 1, 6: Dry contact(relay), Normal Open.
Door Phone
Modular pin(6P4C) 1: L1(The L1 and L2 line is limited to +5 V for detecting a switch
contact.)
−
No. 2 pin: L2
−
No. 3 pin: P+(+12 V)
− No. 4 pin: P-(GND)
© SAMSUNG Electronics Co., Ltd.
1 2 3 4 5 6
1 2 3 4

Figure 2.35 Pin Connection of DPIM

OfficeServ 7100 Service Manual
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