Aiphone NDA-20 Instructions Manual page 2

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COMPONENTS & WIRING
TERMINAL DEFINITIONS CP-544 - Sub & Relay connection PC Board:
NO Normally open side of momentary relay contact (activated when door release button is pressed)
COM Common side of momentary relay contact (activated when door release button is pressed)
NC Normally closed side of momentary relay contact (activated when door release button is pressed)
NO Normally open side of maintained relay contact (activated when station button is selected)
COM Common side of maintained relay contact (activated when station button is selected)
E Common side of voice communication
H 14V DC output
1~4 Station select number (Numbered in sequence per size of master)
(Numbered top to bottom, right to left on master station.)
CN51 Plug for connection to CP-530 (located inside master or add-on selector)
TERMINAL DEFINITIONS CP-543A - Mother Board (Master and Add-On):
NO Normally open side of relay contact (Master Only)
(Activated when Door release button is pressed)
COM Common side of relay contact (Master Only)
(Activated when Door release button is pressed)
X1~X8 Add-on selector connection (Master Only)
Q Occupied circuit control (Master Only)
H 14V DC output (Master Only)
E Common side of communication (Master Only)
S Chime extension output (Master Only)
B All Call signal activation (Master Only)
Y Internal amplifier control (Master Only)
Vn/An All Call Circuit
A+/A- 24V DC Power
B+/B- 24V DC Power (Master Only)
CN1 Connection to NDRM master unit (Master Only)
CN1 Connection to NDA Add-on unit (Add-On Only)
IMPORTANT!
Make sure that terminal board assembly that contains the Master mother terminal board (CP-543A) is connected
to the Master Station. The Add-on terminal board contains the Add-on mother terminal board (CP-543A), but it is
slightly different. Master and add-on mother terminal boards are NOT interchangeable.
TERMINAL BOARD ASSEMBLY LAYOUT:
(NDRM-20 Shown)
CP-543A Mother
Terminal Board
CP-544 Sub & Relay Board
(Stations 13~16)
CP-544 Sub & Relay Board
(Stations 17~20)
CP-543A (Master Station)
CP-543A (Add-On Selector)
7"H x 19"W x 2"D
CP-544 Sub & Relay Board
(Stations 1~4)
CP-544 Sub & Relay Board
(Stations 5~8)
CP-544 Sub & Relay Board
(Stations 9~12)
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