FieldServer FS-8704-49 Appendix C. Troubleshooting Tips Appendix C.1. Bad Values

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Appendix C. Troubleshooting Tips

Appendix C.1. Bad Values

In the event that the driver cannot correctly decode the raw bytes it will generally write a 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. Consult 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 a hex digit is expected but not found then the driver considers this an error and writes the bad value indication OR produces an error message when the bad value indication cannot be used.

Appendix C.2. Dead Nodes

When a node is absent or dies, the driver may go idle and stop communicating with all other nodes. This problem is specific to the Data Aire devices.

Appendix C.3. Noise

A high percentage of responses on the secondary port are preceded with noise. The driver is generally able to filter this noise because legitimate characters in a response are limited to the ASCII character set and a few control characters. The driver does not filter noise in the middle of a message. Thus the message will fail (generally as a checksum failure) when there is noise in the middle of a message. This is normal for most drivers.

Appendix C.4. Ignored Messages

Ignored messages which are messages sent by a DAP/DART for which the driver cannot find an appropriate Map Descriptor are reported by the driver. This simply indicates that a message containing information that is not required 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.

Appendix C.5. Driver limitation

Unable to reset run times.

Appendix C.6. Baud Rate.

Rev 9.5 of the DAP firmware changed the baud rate from 2400 to 9600. All units must have the same baud rate on the network. The customer should check the firmware version of each unit and record these in a table. FieldServer recommends that all units have the same version due to the fact that instability between different versions has been experienced.

Appendix C.7. Wiring.

This must be completed exactly as specified by Data Aire. Variations in the wiring invariably causes problems. The wit=ring/installation guide is available from Data Aire.

FieldServer Technologies 1991 Tarob Court Milpitas, California 95035 USA Web:www.FieldServer.com Tel: (408) 262-2299 Fax: (408) 262-2269 Toll_Free: 888-509-1970 email: support@FieldServer.com

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Contents FS-8704-49 Data Aire DAP Table of Contents Page Performance Issues Dartiii only Data Alarm Network Module Network LED OperationData Aire Description FS-8700-49DataAireDAP Model Hardware ConnectionsData Arrays/Descriptors Configuring the FieldServer as a Data Aire ClientDAP Client Side Connection DescriptionsClient Side Node Descriptors Timing Parameters Driver Related Map Descriptor ParametersMap Descriptor Example 2 Writing a Set-Point Map Descriptor Example 1 EverythingAdditional information is provided in Appendix B UnitType 185 499 855 908 Appendix A.2. Data Point Descriptions Runtimec1 Compressor 1 runtime DAP-Xtra All Adjrate Adjustment rate DAP Menu DAP049,048,046 DAP80 Dcalib Discharge Air sensor DAP80 Menu Valveconfig Chilled water Valve DAP80 Menu FS-8700-49DataAireDAP Appendix A.3. Data Unit Types FS-8700-49DataAireDAP Appendix B.2. DAFunc Parameter Permitted values Appendix B.4. DAMethod Parameter Values and Notes Appendix B.3. DAField Parameter Permitted values4FS-8700-49DataAireDAPPage 29 DAAI1 Rdbc FS-8700-49DataAireDAPPage 31 INH04 DAWR01 Appendix C.7. Wiring Appendix C. Troubleshooting Tips Appendix C.1. Bad ValuesAppendix C.2. Dead Nodes Appendix C.3. NoiseAppendix C.9. Number of Units Appendix C.8. Stuck UnitAppendix D. Error Messages Page Page FYI Appendix D.1. Exposing Driver StatisticsPage Appendix E.2. Associated Map Descriptors Appendix E.3. Starting/Stopping DAP devices Appendix E.4. DAP Unit ErrorsFS-8700-49DataAireDAP FS-8700-49DataAireDAP FS-8700-49DataAireDAP FS-8700-49DataAireDAP Dasetpoints Wrbc Appendix F. Write Through’s This page Intentionally Left Blank
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