Maretron LP-200012UL User Manual

Installation instructions

P/N: M001807 Rev.1.3 1/11

Installation Instructions

LP-200012UL Gas Detector

Instructions
Please follow these instructions to connect the LP-200012UL to the NMEA 2000 network via a Maretron SIM100
Switch Indicator Module. The wiring diagram appears in Figure 1 on the reverse side of this page. The diagram
shows a connection to channel #1, but connections to other channels are similar.

1. Connect the LP-200012UL power terminals to a 12VDC supply that is independent of the NMEA 2000

network power supply, as shown in Figure 1. Powering the unit separately from the NMEA 2000 network
allows the detector to work even when the NMEA 2000 network is powered off.

2. Connect the two alarm contact terminals to a free switch channel on the SIM100. The example in Figure 1

shows the detector connected to switch channel 1, terminals SW1A and SW1B. Note: The detector’s
protective cover must be removed to perform this function.

3. Use a Maretron DSM250 display (firmware 1.3.5 or higher), the DSM250 Viewing function of Maretron

N2KAnalyzer software, or other Maretron display product capable of configuring the SIM100 to set the
switch channel mode (indicated as “Channel #x Mode” on the DSM250) for the appropriate channel to the
“End of Line Resistor” setting. For this example, you would set “Channel #1 Mode” to “End of Line
Resistor”.

4. Supply Power to the NMEA 2000 network and to the LP-200012UL and verify that the switch channel

indicates an “off” (normal) state using Maretron N2KView software, N2KAnalyzer, or other product
capable of displaying switch indicator state.

5. Perform a test using a gas source (cigarette lighter without a flame) applied in front of the LP-200012UL

and verify that the switch channel indicates an “on” (alarm) state during the test.

6. Disconnect either of the two alarm wires between the LP-200012UL and the SIM100 and verify that the

switch channel indicates an “error” state.

7. Reconnect the alarm wires to the SIM100 and verify that the switch channel indicates an “off” (normal)

state.

WARNING:

The LP-200012UL is shipped with an 8KΩ end-of-line resistor installed between the

alarm contact terminals. Do not remove the resistor; it allows an indication if the wires are
inadvertently disconnected between the LP-200012UL and the SIM100.

(continued on reverse)