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©2013 Technical Marine Service, Inc. LC-100 V2.97
The DIGITAL COMMUNICATION tools under the CALIBRATE menu can be used to check
the function of the digital communication module in the LevelCom 100. The items under this
menu are listed here with their function.
COMM STATE: This item is of limited use for troubleshooting. It is used for development of
the software on the communication module itself.
HOST TIMEOUT COUNT: This counts attempts to communicate with the installed module
that failed for some reason. If this counter is counting up there may be a physical problem
with the module. The module was successfully detected by the LevelCom 100 on startup but
it is having trouble communicating.
MOD FAIL COUNT: If the LevelCom 100 tries to communicate with the installed Digital
Communication module and the communication fails this counter is incremented. If this
counter is counting up it means that there might be problems with the installation of the
communication module. Check that the screws securing the communication module to the
sensor circuit board are installed and tight.
MOD SER FAIL COUNT: This counter counts failures to communicate with LevelCom 101
repeater modules. If this counter is counting it suggests a wiring problem between the
LevelCom 100 and the repeater. Alternately the repeater may not be configured with the
proper address. At present there is a problem with the program on the digital communication
module and this counter will increment during normal operation.
MOD SER NACK COUNT: This counter counts NO ACK messages sent back from the
repeaters. If this counter is counting there is probably intermittent trouble with the wiring
between the LevelCom 100 and the repeaters. Messages are getting through but some are
garbled and not readable by the repeater. The repeater sends a NO ACK message to signal
this condition.
REPEATER STATE: There are four items in this, selected by using the UP or DOWN
buttons. Each possible repeater is shown, here, listed as ID1 – ID4. The state of a repeater
is one of three possibilities. If it is set up to communicate and communication is functioning it
will show as ID1 GOOD. If it is set up but not communicating it will show as ID1 NO COMM.
If it is disabled (network address set to 255) it will show as ID2 NOT USED. This item can
help to identify problems if there are multiple repeaters and some are working and some are
not. This can point to configuration issues in the repeaters, network addresses not set up
correctly, or trouble with the wiring between the repeaters and the LevelCom 100.
Modbus Troubleshooting
If the LevelCom 100 is not communicating on the Modbus interface first check that it is
configured to use the Modbus protocol.
After the wiring is verified the next thing to check is the wiring. Verify that the communication
interface is wired correctly; use Appendix A as a guide for wiring.
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