Bosch FPE-7039 - Page 19

MUX expansion module Wiring | en 19
Bosch Security Systems. Inc. 2016.10 | 1.0 | F.01U.330.684
the return wire in ClassA.
4. Read the total resistance of all wires associated with the
loop.
Figure4.2: Measuring Class B loop resistance
1 50Ω maximum 2 MUX bus wires
3 Clip lead
Figure4.3: Measuring Class A loop resistance
1 50Ω maximum 2 MUX bus wires
3 Clip lead