MicroNet SP9121 Manual descarregar pdf (Página 104)

12 Working with Third-party Communication Diagnostics TAC Xenta Server – Gateway, Technical Manual

104 (184) Schneider Electric Buildings AB, June 2011

04-00124-06-en

12.3 Diagnosing Incorrect Target Communications

Run the diagnostics log at the appropriate verbosity level and monitor

the resulting communications activity. If necessary, record the log to

file for later playback.

The type of log data is dependent on the target system. However, the

basic form should resemble the following log excerpts from the Modbus

Master example.

Example log: Correct Operation

Messages prefixed by REQ indicate the type of request that was sent out

to the target system (in the example, the first REQ message retrieved a

range of Modbus registers from the power meter slave device at address

1). The XVAL-prefixed messages indicate a change to an I/O value (in

the above example, the third XVAL message indicates that Plant:Volts

P1 was read from the meter as 258.305 volts). Obviously, the types and

formats of messages are dependent on the target, but should be reason-

ably self-explanatory.

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MicroNet SP9121 Manual Página 104