On-Board Points; Description Terminals; Point Sensor Loops; Point Parameters - Bosch D7212G Operation And Installation Manual

7.0

On-board Points

7.1

Description Terminals

The panel provides eight on-board points. Each point functions independently and does not interfere with the operation of
the others. The panel monitors the sensor loops for normal, shorted, or open conditions between an input terminal (11, 13,
14, 16, 17, 19, 20, or 22) and any of the point common terminals (12, 15, 18, and 21). Programming for the point determines
how the panel responds to those conditions. See the D7212G Program Entry Guide (P/N: 4998138538) for point
programming options. The panel also monitors the sensor loops for ground fault conditions if S4 is latched (ground fault
detect enabled).
7.2

Point Sensor Loops

When wiring the on-board points (see Figure 11), install a 1 k resistor at the far end of the sensor loop to provide a
reference for supervision. Dry-contact sensing devices can be connected in series (normally-closed) and/or in parallel
(normally-open) to any of these loops.
The number of normally-open and/or normally-closed detection devices each sensor loop can supervise is limited only by
the resistance on the loop. The total resistance for wire length and contacts, minus the end-of-line resistor, must not exceed
100
7.3

Point Parameters

The condition of on-board points 1 to 8 can be determined by measuring the voltage across the point input terminal and
one of the common terminals. The sensor loops must be connected and the 1 k end-of-line resistor in place.
Open Loop = Greater than 3.7 VDC, but less than 5.0 VDC.
Normal Loop = Greater than 2.0 VDC, but less than 3.0 VDC.
Shorted Loop = Greater than 0.0 VDC, but less than 1.3 VDC.
7.4

Point Response Time

The panel scans both on-board and off-board point sensor loops every 300 milliseconds. The Debounce Count program
item in the Point Assignment section of the D7212G Program Entry Guide (P/N: 4998138538) determines point response time
by setting the number of scans that a point must be faulted before the panel initiates an alarm.
The debounce count can range from 2 to 15. Therefore point response time ranges from 600 ms to 4.5 sec. The Bosch
Security Systems default for Debounce Count is 2.
Increasing debounce may cause missed alarms: If you increase the Debounce Count, detection devices may go into
alarm and reset without exceeding the point response time.
WARNING
Bosch Security Systems recommends a debounce count of 2 for all points except for Interior Follower points, which should
be programmed as a 3.
Point Input
Terminal
Common
Point Input
Terminal
Common
Point Input
Terminal
Common
Combination: Normally-Open Contacts and Normally-Closed Contacts (NONC)
© 2003 Bosch Security Systems
100 Ohms maximum
Normally-Closed Contacts (NCC)
Normally-Open Contacts (NOC)

Figure 11: On-board Point Sensor Loop Wiring

D7212G Operation and Installation Guide
Page 35
D7212G
On-board Points
1 k
Brown
Red
Black
Bosch Security Systems
D105F or D105BL
(UL Listed Burglar
Applications)
End-Of-Line
Resistor
4998138544C