SATEL
INTEGRA
14
4.5 Connecting LCD keypads and other devices to keypad bus
Depending on the selected control panel
,
from 4 to 8 different keypads or other devices to be
connected to keypad bus can be installed in the system. They are connected in parallel.
The data are addressable and all devices function independently
.
The keypad bus terminals on control panel mainboard have designations COM, +KPD, DTM
and CKM. The +KPD output enables powering of the keypad bus devices (the output has
a polymer fuse).
The distance between the keypad or other device to be connected to keypad bus and the
control panel may be up to
300 m
. Table 1 shows the number of wires required for correct
connection of devices to the keypad bus, if using a 0.5 mm
2
cross-section straight-through
cable.
+KPD COM CKM DTM
Distance Number
of
wires
up to 100 m
1
1
1
1
100-200
m
2 2 1 1
200-300
m
4 4 2 2
Table 1.
Notes:
•
The signal wires (CKM, DTM and COM) must be run in one cable!
•
Supply voltage measured at the LCD keypad terminal block, with the backlighting on, must
not be lower than 11 V.
•
Devices installed far from the control panel may be supplied locally from an independent
power source.
Fig. 5. Partial view of keypad board: INT-KLCD-GR / INT-KLCD-BL / INT-KLCDR-GR /
INT-KLCDR-BL.
Explanations to Figures 5, 6 and 7:
1 – buzzer
2 – tamper contact
3 – RS-232 port