Wiring POPITs to the Data Expansion Loop
You can connect up to 63 POPITs to each D8125 module. Use one
Review Premises Wiring in the Installation section of this manual to determine if shielded wire is required. Determine the required wire gauge for each data expansion loop using Table 1.
Combine data expansion loops: The maximum lengths shown in Table 1 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 60ý.
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. Figure 13 shows a typical configuration.
1.Connect the positive (+) Data terminal from one POPIT to the positive (+) Data terminal on the next POPIT.
2.Connect the negative
3.Repeat steps 1 and 2 to connect all POPITs to the expansion loop. You don’t need to wire the POPITs in any particular order on the loop. The switch setting on each POPIT assigns it a point number, regardless of its physical location.
Three inch clearance for tampered POPITs: Mount tampered POPIT Modules at least three inches apart to prevent the tamper magnets from interfering with each other.
Maximum Length of All
Data Expansion Loops
Combined
AWG
22
20
18
16
14
Length (Feet)
1,800
2,890
4,600
7,320
11,650
Table 1: Data Expansion Loop Wire Specifications
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