FieldServer FS-8700-78 Driver Manual 6.2 Related Documents, Troubleshooting Tips 6.3.1 Bad Values

Driver Manual

6.2Related Documents

The driver as specified in this manual is based on Data Aire Poll and Response Protocol Revision 3.2 dated 4 Nov 1997.

The driver is compliant with a later release of the specification Revision 3.7 - 21 JUN 00.

6.3Troubleshooting Tips

6.3.1Bad Values

In the event that the driver cannot correctly decode the raw bytes it will generally write an value which indicates bad data. In most cases the indicating value is -1 or 65535 (depending on data type). When setting bits for status fields the driver will not write new data to the array if the incoming byte is invalid. Look in the error log for indication of this type of problem.

Example. Valid ASCII digits are 0..9,A..F. If a byte is being parsed and an hex digit is expected but not found then the driver considers this an errors and writes the bad value indication OR produces an error message when the bad value indication cannot be used.

6.3.2Dead Nodes

When a node is absent or dies it is possible that the Dart may go idle and stop communicating with all other nodes. This problem is not related to the driver but to the Data Aire devices.

6.3.3Ignored Messages

The driver reports ignored messages. These are messages sent by a DAP/DART for which the driver cannot find a map descriptor to store the message. This does not mean the driver is not working. It means that a message which contains data that the driver/you are not interested in is being discarded.

The current version of the driver ignores a few messages relating to the status of the DART device. Later versions of the driver will be capable of storing these messages and the number of ignored messages will decrease.

FieldServer Technologies 1991 Tarob Court Milpitas, California 95035 (408) 262-6611 fax: (408) 262-9042

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