5
Bosch | 09/05 | 38685F
D7039
| Installation Guide | 4.0 Specifications
Figure 5:
Measuring Class “B” Loop Resistance
1 - 50
Ω
maximum
2 - Mux bus wires
3 - Clip lead
Figure 6:
Measuring Class “A” Loop Resistance
1 - 50
Ω
maximum
2 - Mux bus wires
3 - Clip lead
You can configure the D7039 with a single fault tolerant Class “A” loop or as a pair of supervised Class “B”
loops. When configured as a Class “A” loop and installed on a D7024 Control Panel before Lot #100, the
D7039 implements a Style 4.5 signaling line circuit (SLC). When installed on a D7024 Control Panel Lot #100
or later, the D7039 implements Style 6 SLC. Refer to the
D7024 Operation and Installation Guide
(P/N: 31499)
for programming.
When configured as a Class “B” loop and installed on a D7024 Control Panel before Lot #100, the D7039
implements a Style 3.5 SLC. When installed on a D7024 Control Panel Lot #100 or later, the D7039
implements a Style 4 SLC. Refer to the
D7024 Operation and Installation Guide
(P/N: 31499) for programming.
2. Measure loop resistance by shorting the end of the farthest device in Class “B” (
Figure 5
) or shorting the return
wire in Class “A” (
Figure 6
) and reading the total resistance of all wires associated with the loop.
3. Ensure the loop is disconnected from the D7039 Module.
