Satel CA-64 - Page 22

CONTROL PANEL INSTALLATION
21
Connection of LCD keypads
Up to eight independent LCD keypads, designed for control and programming the
alarm system, may be connected to the control panel CA-64. When some keypads
are being connected to the control panel, connect them in parallel. Since keypad bus
data are addressed, all keypads operate independent of each other.
LCD keypads are to be connected to COM, +KPD, DTM and CKM terminals. Output
+KPD makes possible to power all eight keypads (this output is provided with
electronic protective circuit breaker with a 3A limiter). Each keypad must be
connected with its separate cable (it is recommended to use a typical, non-screened
cable). Maximum distance between keypad and control panel is up to300 m.
The lowest possible resistance of cables is important for correct operation of
keypads. Depending on the distance between a keypad and the control panel the
following number of cable wires must be provided for individual connections when
using a typical cable DY 8x0,5 in.
Distance Description
Number of
cable wires
up to 100 m
Power supply +KPD an
d
COM ground
CKM and DTM signals
2 x 1
2 x 1
up to 200 m
Power supply +KPD an
d
COM ground
CKM and DTM signals
2 x 2
2 x 1
up to 300 m
Power supply +KPD an
d
COM ground
CKM and DTM signals
2 x 4
2 x 2
NOTES:
• CKM, DTM and COM wires must be in the same cable!
• Power supply measured at the LCD keypad terminal, when the backlight is on,
cannot be less than 11V.
• The presence of power supply voltage at the +KPD terminalr is signalled by the
fifth LED in the electronic circuit breakers block.
• Keypads, which are installed far from the control panel, may be powered locally
from an independent power source. These keypads are connected to the system
with the use of CKM, DTM and COM signals.