8 System Error Message Descriptions
The Level Plus software displays several error messages that typically reflect system problems.
The possible system error messages are described below.
Error messages are grouped into two categories: error messages associated with data communica-
tions with the DDA tank gauges and error messages associated with system operations.
An example of a communication error message is shown below.
Communication error message example
The *NO COMM communication error message indicates that no address/command communica-
tion echo (no response) was received from the DDA tank gauge associated with tank #1.
Possible causes for the *NO COMM communication error message include:
A. Incorrect field wiring or faulty connections.
B. DDA gauge communication address switch improperly programmed
C. Inadequate power supply voltage available to DDA tank gauge.
D. Power override switch in DDA tank gauge set to 'ON' (should always be OFF).
E. Malfunctioning DDA tank gauge.
Other communication error messages and their possible causes are listed below.
*COMM ERR - improper address/command communication echo received from DDA tank
gauge.
*DATA ERR - unexpected data format received from DDA tank gauge.
*NO DATA - no data received from DDA tank gauge after address/command communi-
cation echo received.
Possible causes for these communication error messages include:
A. Two DDA tank gauges programmed with the same communication address.
B. Excessive noise on the RX/TX communication wires.
C. Malfunctioning DDA tank gauge.
*CSUM ERR - data checksum error
Possible causes for the *CSUM ERR communication error message include:
A. Checksum function on DDA tank gauge not enabled.
B. Excessive noise on the RX/TX communication wires.
TANK#1: *NO COMM
INTER: *NO COMM
TEMP: *NO COMM
PRDHH INTLO TMPHI
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