Bosch Appliances D9112 Maximum Length of All Data Expansion Loops Combined

D9112 Operation & Installation Manual
Page 38
74-06144-000-C 2/96 © 1993-1996 Radionics
Wiring POPITs to the Data Expansion Loop
You can connect up to 63 POPITs to each D8125 module. Use one 2-wire data
expansion loop or distribute the POPITs on up to three loops. Setting DIP switches on the
POPIT modules assigns them to point numbers. See POPIT Module Point Assignments.
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 (-) 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. 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.
Table 1: Data Expansion Loop Wire Specifications
Maximum Length of All
Data Expansion Loops
Combined
AWG Length (Feet)
22 1,800
20 2,890
18 4,600
16 7,320
14 11,650