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Communication line category: Serial.
The parameters of an asynchronous line are set according to version and type of device connection.
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Communication station configuration
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Communication protocol: Paufex DIRAS.
The station address is a decimal number in the range 0 up to 127.
If necessary, the synchronization of the real-time of the station can be enabled.
Station protocol parameters
You can set the following parameters:
Table 1
Key word| Keyword | Full name | Meaning | Unit | Default value |
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| Retry Count |
Number of response retries if some error in communication occurs| Maximum count of request retries. If no response returns after a request had been sent, the station's status will change to a communication error. | - | 3 |
| Max Wait Retry |
Maximum | The maximum number of retries of |
reading until it is completedDelay between the response retry if some error in communication occurs| Timeout before resending a request if no response has been received. | ms | 1000 |
millisec.Delay readings until it is completed400 millisec.First waiting for response | The delay after sending the request and before reading the response. | ms |
500 millisec. | A string String containing the protocol parameters is being defined as follows:
Key_word=value;Key_word=value; ...
Example:
RC=1;RT=500;
If there is used a keyword with an invalid value is in the initialization string, there will be used the corresponding default value according the to table 1 will be used.
I/O tag configuration
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I/O tags: Ai, Ao, Ci, Co, Di, Do, TiA, ToA, TiR, ToR.
The address requires three parameters: type, number, and reference.
The values are set in hexadecimal format:
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Data reading is done in the individual references by the message 02. Message 03 is used to write a new value to the reference.
A real-time may be read/written also with the I/O tag - of TiA (or ToA) type, with address Type=FF, NrNumber=FFFF, RefReference=FF.
Message 0B ensures the real time reading of real-time and Message OC the writing of real-time writing.
Literature
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