Supported device types and versions
Communication line configuration
Communication station configuration
I/O tag configuration
Literature
Changes and modifications
Document revisions
This protocol supports data reading and writing to DIRAS devices produced by Paufex s.r.o. Prešov.
Communication line category: Serial.
The parameters of an asynchronous line are set according to version and type of device connection.
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.
You can set the following parameters:
Table 1
| Keyword | Full name | Meaning | Unit | Default value |
|---|---|---|---|---|
| Retry Count | 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 | The maximum number of retries of the response reading. | - | 8 | |
| Retry Timeout | Timeout before resending a request if no response has been received. | ms | 1000 ms | |
| Wait Timeout | The delay between the response readings. | ms | 400 ms | |
| Wait First Timeout | The delay after sending the request and before reading the response. | ms | 500 ms |
A string containing the protocol parameters is being defined as follows:
Key_word=value;Key_word=value; ...
Example:
RC=1;RT=500;
If a keyword with an invalid value is in the initialization string, the corresponding default value according to table 1 will be used.
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:
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, Number=FFFF, Reference=FF.
Message 0B ensures the reading of real-time and Message OC the writing of real-time.
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