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P/N: SIM100-01
Switch Indicator Module

Maretron’s Switch Indicator Module monitors switch closure devices including, but not limited to, safety equipment (e.g., heat, smoke, carbon monoxide, explosive vapor detectors), security systems (e.g., motion, vibration, glass break, door and port hole magnetic switches), and vessel monitoring equipment (e.g., valve closed/open, high water bilge). The SIM100 continually monitors these switch closure devices and broadcasts information over the NMEA 2000® network about the switch state so the crew can be alerted to potential conditions or problems that warrant further investigation.

Advanced features of the SIM100 include the ability to detect whether or not power has been disconnected from the monitored device or if the signal wires have been disconnected due to either corrosion, tampering,
or for any other reason (if the monitored device is so equiped). With the SIM100, you can rest assured that critical sensors are receiving power, signal wires are connected, and all the safety, security and vessel functions are under constant supervision.


  • Monitors and reports the running statuses of six independently connected devices
  • Can detect and report problems like opens and shorts in switch circuits


Part number Description
SIM100-01 Switch Indicator Module
SH-449CSTE Smoke/Heat Detector
BHW100 Bilge High Water Detector
CO-CO1224T Carbon Monoxide (CO) Detector (Surface Mount White)
VS-07.0HG Vacuum Switch (7” Hg or 24kPa)
MS-1035 Magnetic Switch Rectangular (Indoor)
MS-1085-N Magnetic Switch Rectangular (Outdoor)
MS-1055-N Magnetic Switch Cylinder (Indoor/Outdoor)
MS-1075 Magnetic Switch Recessed (Indoor/Outdoor)
10233 1” FPT Cooling Water Flow Switch
10271 1-1/2” FPT Cooling Water Flow Switch
10231 2” FPT Cooling Water Flow Switch


Parameter Type Comment
End of Line Resistor 8 KΩ ± 5% Included with Maretron-supplied sensors


Standard Comment
NMEA 2000® Standard Level A
Maritime Navigation and Radio Communication Equipment & Systems IEC 61162-3
Maritime Navigation and Radiocommunication Equipment & Systems IEC 60945
FCC and CE Mark Electromagnetic Compatibility

NMEA 2000® Parameter Group Numbers (PGNs)

Description PGN # PGN Name Default Rate
Periodic Data PGNs 127501 Binary Switch Bank Status 1 Time/15 seconds and on switch change
Response to Request PGNs 126464
PGN List (Transmit and Receive)
Product Information
Configuration Information
Protocol PGNs 059392
ISO Acknowledge
ISO Request
ISO Address Claim
ISO Address Command
NMEA Request/Command/Acknowledge
Maretron Proprietary PGNs 128720 Configuration N/A


Parameter Value Comment
Operating Voltage 9 to 32 Volts DC Voltage
Power Consumption (Maximum) 100mA NMEA 2000 Interface
Load Equivalence Number (LEN) 2 NMEA 2000® Spec. (1LEN = 50 mA)
Reverse Battery Protection Yes Indefinitely
Load Dump Protection Yes Energy Rated per SAE J1113


Parameter Value Comment
Size 3.50” x 4.20” x 2.03” (88.9mm x 106.7mm x 51.6mm) Including Flanges for Mounting
Weight 13 oz. (368.5 g)  


Parameter Value
IEC 60945 Classification Exposed
Degree of Protection IP64
Operating Temperature -25°C to 55°C
Storage Temperature -40°C to 70°C
Relative Humidity 93%RH @40° per IEC60945-8.2
Vibration 2-13.2Hz @ ±1mm, 13.2-100Hz @ 7m/s2 per IEC 60945-8.7
Rain and Spray 12.5mm Nozzle @ 100liters/min from 3m for 30min per IEC 60945-8.8
Solar Radiation Ultraviolet B, A, Visible, and Infrared per IEC 60945-8.10
Corrosion (Salt Mist) 4 times 7 days @ 40°C, 95%RH after 2 hour Salt Spray Per IEC 60945-8.12
Electromagnetic Emission Conducted and Radiated Emission per IEC60945-9
Electromagnetic Immunity Conducted, Radiated, Supply, and ESD per IEC 60945-10
Safety Precautions Dangerous Voltage, Electromagnetic Radio Frequency per IEC 60945-12


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Marinplus AB/Odelco AB
Missionsvägen 77
SE-167 33 BROMMA


+46 8 718 03 00


Marinplus AB has merged with Odelco AB, thereby becoming the first and only distributor that can offer a complete range of products and solutions for power supply, modern electrical systems, rescue and security systems.


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