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If the system has four-wire devices (non-isolated), Remove or install plugable jumpers JW1 and
JW2, which are located on the MAPNET Transceiver Motherboard, as follows:
• If only two-wire devices (IAMs and detectors) are on the MAPNET channel, make sure a
jumper is installed in JW2 and remove the jumper from JW1. (A resistance of 50 K Ohms or
less between Earth and any of the four MAPNET comm. lines causes the motherboard to
detect an Earth Trouble on a system with two-wire devices.)
• If four-wire devices (ZAMs, sounder bases, relay bases) are on the MAPNET channel,
remove the jumper from JW2 and make sure a jumper is installed in JW1. This disables the
MAPNET Earth detect and ties it to the main system’s Earth detect circuit.
Refer to Figure 2 for the locations of jumpers JW1 and JW2.
Figure 2. Locations of Jumpers JW1 and JW2
Removing/Installing JW1 and JW2
Overview
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