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©2013 Technical Marine Service, Inc. LC-100 V2.97
The contacts are labeled for the relays in a de-energized state.
NC = Normally Closed
COM = Common
NO = Normally Open
The Relay Outputs are rated for “Pilot Duty”. Contacts are rated at 5A non-inductive, 115
VAC or 30 VDC. Maximum ratings are 250 VAC/125 VDC/150 W. It is not recommended
that these contacts be used to switch inductive loads. In cases where higher loads need to
be switched, an external slave relay rated for the higher current must be used. After wiring is
complete secure the conductors to the wiring support bracket using a cable tie.
Note: When used with 115VAC circuits, those circuits must be powered by an Overvoltage
Category II Power source.
RS-422/485 Serial Communication
Since Serial Communication is an option, this five-point connector may not have been
installed in your LevelCom 100. If this option has been selected, the connector can be found
toward the left side of the LevelCom enclosure on the Communications Module. The
connector is actually a plug and socket. Note the printing on the circuit board above the
socket which reads [RX-] [RX+] [TX-] [TX+] [GND].
The terminals are described below:
[RX-] Receive Data (- polarity), Connect to Computer [TX-] Transmit Data (- polarity)
[RX+] Receive Data, (+ polarity) Connect to Computer [TX+] Transmit Data, (+ polarity)
[TX-] Transmit Data, (- polarity) Connect to Computer [RX-] Receive Data, (- polarity)
[TX+] Transmit Data, (+ polarity) Connect to Computer [RX+] Receive Data, (+ polarity)
[GND] Common Connect to Computer Common
Use cable designed for RS-422/485 communications. These cables are usually shielded
twisted pairs with a characteristic impedance of 120 ohms. If the system is using separate
transmit and receive channels you will need two pairs. Otherwise a single twisted pair is
needed. Cable runs can be up to 4000 feet long. The LevelCom 100 can be configured to
communicate using the Modbus RTU protocol. The baud rate and parity are configurable.
Up to 64 LevelCom 100’s can be paralleled on one communication cable.
Use cable specified for RS-422/485 for these connections.
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