D9412G/D7412G Point Expansion - Bosch D8125 Operation And Installation Manual

D8125
Overview
2.2

D9412G/D7412G Point Expansion

The D9412G can use Point of Protection Input Transponder (POPIT) Modules to provide a maximum of 238 off-board
points, bringing the total number of points the D9412G can monitor to 246. The D7412G provides up to 67 off-board
points, bringing the total number of points the D7412G monitors to 75. Each
off-board point requires a POPIT Module.
POPITs connect to supervised two-wire data expansion loops run from POPIT to POPIT throughout the premises. Data
expansion loops connect to a D8125 Point of Protection Expander (POPEX) Module. POPEX Modules connect to the point
bus on the panel, Terminals 23 and 24 for power (3 and 9 on the D7412G), and Terminals 25 and 26 (D9412G only), or 27
and 28 for data.
If a programmed POPIT is disconnected from the expansion loop, a missing condition appears immediately and the event is
logged. The missing condition may also be transmitted to a central station or printed to an on-site printer, if programmed to
do so. See the D9412G/D7412G Program Entry Guide for programming options.
Extra Point events are generated when a POPIT is connected to the data expansion bus but does not have a Point Index
assigned to it. Shown below are instances when an Extra Point event is or is not generated.
If a POPIT is connected to the data expansion bus but does not have a Point Index assigned to it and...
· the data expansion bus becomes disconnected, no trouble condition is annunciated or displayed at command centers
and the Extra Point event is not generated. (However, POPITs programmed with a Point Index immediately go
missing.)
· the data expansion bus restores to a normal condition from an open, a trouble condition annunciates and displays at
the command center. In addition, an Extra Point event is generated, logged, and may be programmed to be sent to the
central station or printed to an on-site printer.
· the point input goes from an electrically normal state to an open or shorted state, the command center neither
annunciates nor displays a trouble condition. No Extra Point event is generated.
· the system is presently in a Service Walk Test and the point input goes from an electrically normal state to an open or
shorted state, the command center neither annunciates nor displays a trouble condition. However, an Extra Point
event is logged and printed to an on-site printer, if programmed. Note: The Service Walk Test never displays a points'
electrical state as 'Extra' .
If the positive or negative leg of the data expansion bus is shorted to earth ground and Ground Fault Detect is enabled, a
general Ground Fault event is generated.
If the positive or negative leg of the data expansion bus becomes disconnected, all POPITs beyond the break report as a
missing condition.
If the data expansion bus becomes shorted, all POPITs report a missing condition and a Pt Bus Trouble event is generated.
When the data expansion bus restores from a shorted condition, a Pt Bus Restore event is generated, and if there are POPITs
connected to the data expansion bus without a Point Index assigned to it, an Extra Point event is generated.
If the positive or negative leg of the data expansion bus becomes shorted to a Common terminal on the D7212G, all POPITs
report a missing condition. In addition, a Pt Bus Trouble event is also generated.
If Terminal 28 becomes shorted to a Common terminal, a Pt Bus Trouble event is not generated. However, a short between
Terminal 27 and a Common terminal generates a Pt Bus Trouble event and the command center displays SERVC ZONEX
1. If Terminal 27 and Terminal 28 are shorted together, a Pt Bus Trouble event is generated and the command center displays
SERVC ZONEX 1.
The D7212G responds to missing point conditions based on how the points are programmed and which armed state the
area is in the point is assigned to. For example, if an interior motion detector point went missing during a disarmed state, a
Missing Trouble event is generated. However, if the point went missing while the area was Master Armed, a Missing Alarm
event is generated. Non-fire, 24-hour points always generate a Missing Alarm event whereas Fire points always generate a
Missing Fire Trouble event.
74-04247-000-N
D8125 Operation and Installation Guide
Page 10 © 2004 Bosch Security Systems, Inc.