User`s manual

®®
2.4.2.1 Switch With End of Line Resistor
Installing an end of line resistor as close to the switch as possible allows
the SIM100 to detect if the signal wires have been disconnected due to either
corrosion, tampering, or for any other reason. This allows the SIM100 to report
over the NMEA 2000 network if the sensor has become disconnected in addition to
the normal closed and open indications.
Please refer to Figure 3 for connecting the SIM100 to a switch with an end of line resistor.
This figure shows the connection of the monitored switch to switch channel 1 via the terminals
named SW1A and SW1B. Connections to other switch terminals are similar.
SIM100 Screw Terminals
Monitored switch
1 2 5 4 3 6 7 8 9 10 11 12
SW1A SW2B SW1B SW2A SW3A SW3B SW4A SW4B SW5A SW5B SW6A SW6B
8 KΩ end-of-
line resistor
Figure 3 – Switch With End of Line Resistor Connection Diagram
2.4.2.2 Switch Without End of Line Resistor
Please refer to Figure 4 for connecting the SIM100 to a switch without an end of line resistor.
This figure shows the connection of the monitored switch to switch channel 1 via the terminals
named SW1A and SW1B. Connections to other switch terminals are similar.
Revision 1.2 Page 5