Bosch Appliances D7212G manual Expansion Loops Combined, Length in ft. m, Popit Sensor Loops

D7212G

Off-board Points

Maximum Length of all Data

Expansion Loops Combined

AWG

Length in ft. (m)

22	1800 (548)
20	2890 (881)
18	4600	(1402)
16	7320	(2231)
14	11650	(3551)

Table 9: Data Expansion Loop Wire Specifications

Combine data expansion loops: The maximum lengths shown in Table 9 are for all data expansion loops connected to the same POPEX Module combined.

Before installing the POPITs, make sure the resistance on the data expansion loop is no more than 40 Ω.

IMPORTANT

Wiring POPITs together: Do NOT connect POPITs to each other in series, or with a T-tap. Doing so may cause random missing POPIT conditions. Follow the procedure below to connect POPITs to one another in parallel.

1.Connect the positive (+) Data terminal from one POPIT to the positive (+) Data terminal on the next POPIT.

2.Connect the negative (-) Data terminal from one POPIT to the negative (-) Data terminal on the next POPIT.

3.Repeat steps 1 and 2 to connect all POPITs to the expansion loop. The POPITs don’t need to be wired in any particular order on the loop. The switch setting on each POPIT assigns it a point number, regardless of its physical location.

Clearance for tampered POPITs: Mount tampered POPIT Modules at least 3.0 in. (7.6 cm) apart to prevent the tamper magnets from interfering with each other.

8.3.4Wiring Data Expansion Loops to POPEX Modules

There are two positive (+) and two negative (-) data expansion loop terminals on each POPEX Module. Follow the procedure below to connect the data expansion loops to the D8125 POPEX Module (see Figure 13 on page 40). Remember, a maximum of 32 POPITs can be connected to one D8125 on the D7212G.

1.Connect the positive (+) Data terminal from the first POPIT on the data expansion loop to one of the D8125 Module’s positive (+) terminals.

2.Connect the negative (-) Data terminal from the first POPIT on the data expansion loop to one of the D8125 Module’s negative (-) terminals.

8.3.5POPIT Sensor 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. Resistance on each sensor loop must be less than 100 Ω not including the EOL resistor.

Certain UL and NFPA applications may limit the number of detection devices. Consult the appropriate UL or NFPA standards.

POPITs detect open, shorted, normal, and grounded circuit conditions on their sensor loops. A ground on the sensor loop reports as a general system ground fault condition (see Ground Fault in the D9412G/D7412G/D7212G Installation and Troubleshooting Quick Reference Guide [P/N: 43700]). Each POPIT is programmed and transmits to the panel separately.

Terminate each POPIT sensor loop with the 33 kΩ end-of-line resistor [D106F) included with each POPIT.

Bosch Security Systems recommends the use of twisted-pair wire (six twists per foot) in all POPEX/POPIT installations for both the data expansion loop wiring and the POPIT sensor loops. Run wires away from AC sources to prevent AC induction. If a noisy environment is suspected, use shielded cable. See Section 8.3 Installing the D8125 POPEX Module on page 38.

D7212G Operation and Installation Guide

© 2003 Bosch Security Systems Page 39 4998138544C