The example shown indicates Side Tank Indicator #1 currently has a communication error (*CME)
and Side Tank Indicator #2 currently has a checksum error (*CSE). The error messages are abbre-
viated due to limited LCD display space. The abbreviated error messages for the STI interface are
defined below.
*CME - Communication Error. The CME error indicates that a general communication
error has occurred.
Possible causes for the *CME error message include:
A. Incorrect field wiring or faulty connections.
B. STI communication address switch improperly programmed
C. Inadequate power supply voltage available to STI module.
D. Power override switch in STI module set to 'ON' (should always be OFF).
E. Two STI modules programmed with the same communication address.
F. Excessive noise on the RX/TX communication wires.
G. Malfunctioning STI module.
*CFE - Command Format Error. The CFE error indicates that Level Plus monitor received
a command format NAK from the STI module.
Possible causes for the *CFE error message include:
A. Two STI modules programmed with the same communication address.
B. Excessive noise on the RX/TX communication wires.
C. Malfunctioning STI module.
*CSE - Checksum Error. The CSE error indicates that Level Plus monitor received a check-
sum calculation NAK from the STI module.
Possible causes for the *CSE error message include:
A. Excessive noise on the RX/TX communication wires.
B. Malfunctioning STI module.
*UAE - UART Error. The UAE error indicates that Level Plus monitor communication
UART circuitry is not responding.
Possible causes for the *UAE error message include:
A. Electronic component failure on the Level Plus Monitor communication board.
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