SILENT KNIGHT 4821 Manuel d'installation Page 62

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Model 4821/4820 Control/Communicator Installation Manual
4-18 150964
4.14 Touchpad Installation
This section describes installation of a touchpad for basic system operation. For information
about how to install 4860C touchpads as input zones, see Section 4.15.5.
4.14.1 Touchpad Specifications
When installed for use as an access control system the touchpad must be located inside the
protected premises.
24 touchpads/card readers maximum per system.
All touchpads require four wires to operate.
Maximum distance from the control panel depends on the number of devices attached to
the SBUS. See Section 4.13.3 for complete information.
Maximum current draw: 90 mA
Standby current draw: 48 mA
Maximum allowed voltage drop for a touchpad wire run: 2V
For best system performance, connect most touchpads to the same SBUS, either SBUS1
or SBUS2. (Connect all other SBUS devices to the SBUS that is not used by touchpads.)
4.14.2 Mounting Touchpads
1. Separate the top section from the rear mounting plate. Do this by inserting a small flat-
blade screwdriver into the slot located on the bottom edge of the frame. (See Figure 4-11.)
Push in, then lift up the top section.
Figure 4-11 Mounting Plate Slot location.
2. Secure the mounting plate to the wall using the screw (#6 or #8) appropriate for the type of
wall material.
3. The mounting plate should be oriented so that the protruding tab and the three posts are
towards the bottom. Pull the wires through the hole in the rear mounting plate.
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