D279A Independent Zone Control; Keyswitch; Description; Programming - Bosch D7212G Operation And Installation Manual

10.3

D279A Independent Zone Control

Any on-board or OctoPOPIT point can be programmed so that the D279A Independent Zone Control operates as
independent point control (arms and disarms the point).
• See the Point Assignments in the D7212G Program Entry Guide (P/N: 4998138538) for programming information.
• See the D279A Operation and Installation Guide (P/N: 46456) for wiring and operation instructions.
10.4

Keyswitch

10.4. 1

Description

A maintained or momentary contact arming station (keyswitch) can be connected to master arm/disarm any of the areas in
the system. The keyswitch is connected to an on-board or off-board point's sensor loop. Relays can be programmed to
activate arming status LEDs for keyswitch arming stations. See Relays in the D7212G Program Entry Guide
(P/N: 4998138538).
10.4.2

Programming

See Point Assignments in the D7212G Program Entry Guide (P/N: 4998138538) for the correct programming for points used
for keyswitches.
10.4.3

Installation

For maintained switches, connect the end-of-line resistor for the point at the keyswitch so that the switch opens the circuit
when it operates. A short on the circuit produces an alarm if the area is armed and a trouble if it is disarmed. See Figure 18.
For momentary switches, connect the end-of-line resistor for the point at the keyswitch so that the switch shorts the resistor
when it operates. An open on the circuit produces an alarm if the area is armed and a trouble if it is disarmed. See Figure 18.
10.4.4

Keyswitch Operation

Maintained Contact
If the point to which the keyswitch is connected is programmed for a maintained contact, an open on the arming circuit
arms the area. All faulted points are force armed, regardless of the entry in the FA Bypass Max program item. Returning the
circuit to normal disarms the area. See Area Parameters and Point Assignments in the D7212G Program Entry Guide (P/N:
4998138538).
Momentary Contact
If the point to which the keyswitch is connected is programmed for a momentary contact, shorting the arming circuit toggles
the area's arming state between armed and disarmed. All faulted points are force armed, regardless of the entry in the FA
Bypass Max program item. See Point Assignments in the D7212G Program Entry Guide (P/N: 4998138538).
Silencing the Bell
To silence the bell (stop Alarm Bell output) if the system is armed, operate the keyswitch to disarm the area. If the area is
disarmed, operate the keyswitch once to start the arming process and a second time to stop the arming process and silence
the bell.
MAINTAINED KEYSWITCH
COMMON
POINT INPUT
* Use 1 k end-of-line resistors if using one of the zones on the panel or an OctoPOPIT.
© 2003 Bosch Security Systems
1 k * OPEN ON
or
CIRCUIT
33 k *
ARMS AREA
Use a 33 k resistor if using a POPIT.

Figure 18: Keyswitch Wiring

D7212G Operation and Installation Guide
Page 51
MOMENTARY KEYSWITCH
COMMON
1 k *
or
33 k *
POINT INPUT
D7212G
Arming Devices
SHORT ON
CIRCUIT
TOGGLES
ARMING
STATE
4998138544C