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In some fire alarm control systems, the switch is grounded internally. This type of
switch should be connected in the following manner, sharing ground between the
control system and the firefighter gateway
In these cases, a Normally Open relay will connect L1/L2 to ground for safety, and
when active, L1/L2 is 5V. This will be configured as a reverse polarity switch.
Connecting and Configuring an Emergency Stop
Button to the Gateway
1. Depending on the button/relay type, connect L1/L2, 5V and Ground as described
above. Use wire size 20 AWG/ 0.52mm2: Insert the ends of wires into the ports of the
supplied 6-pin terminal block.
Firefighter Gateway Installation Guide MAN-01-00113-1.4
51
Connecting and Configuring an Emergency Stop Button to the Gateway