Aiphone My-Cu - Manual (Page 4)

WIRING
Single-entry, multiple-monitor system
MY-CU is capable of connecting one PanTilt door station and two additional
MYH-CU sub monitors.
It can be further expanded with an additional MYH-CU('s), by locating a power
supply(ies) for every 4 MYH-CU('s) (total 10 monitors).
Cable requirements
PanTilt door station
Room monitors
Use a single pair (parallel) cable. Coaxial cable or 2 separate wires can not be
used. When existing doorbell or chime wires must be used, locate and
disconnect the bell transformer from the wires. Extra pair(s) in the installed
cable to video door station can affect the image quality, and must be terminated
with a 120 ohm resistor at each end of wires on both video door station and
video monitor(s).
Use 6-conductor (parallel) cable, 0.65 ~ 1.0 mm dia., 22 ~ 18AWG. The video
cable must be separately sheathed from intercom’s (any), running from monitor
to monitor without any reconnections on other junction. Max. 75 m, 250’ is
allowed from MY-CU to farthest MYH-CU in any configuration with 1.0 mm dia.,
18AWG. When locating a third monitor (MYH-CU) up to 75 m, 250’ away, 8-
conductor cable must be run monitor to monitor, as each - h , - wire has to be
doubled.
★ For proper operations, MYH-CU must be be fed 15.5V ~ 19.1 V.
Terminal block layout
Meaning of terminal symbols
1A1, 1A2
B1, B2
+, -
U1
U2
D1
D2
E
G
For video & audio signals
For video output
For power supply
For output control
For input control
For audio signai & image on
For detecting calling at
IF-DA & image off
For common line
Grounding
MY-CU MYH-CU
Impedance-matching
When MY-CU has an MYH-CU sub-monitor(s),
locate a switch to lower OFF on all MYH-CU(s),
while the initial ON may remain unchanged on
the last MYH-CU to terminate.
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