3 Basics | LXM32M |
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3.3.4.3 Parameter channel
The master can request a parameter value from the slave or change a parameter value via the parameter channel. Each parameter can be uniquely addressed via the index and subindex.
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| Byte | 0 | 1 | 2 |
| 3 |
| 4 | 5 | 6 | 7 |
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| PV |
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| Index | ||||
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| Subindex |
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| Ctrl |
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| Figure 4: Parameter channel |
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Ctrl | Byte "Ctrl" contains the request to read or write a parameter. | ||||||||||||||||
| The transmit data contains the information whether a parameter is to | ||||||||||||||||
| be read or written. The receive data contains the information whether | ||||||||||||||||
| the read request or the write request were successful. | ||||||||||||||||
| Transmit data: |
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| Ctrl | Function |
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| 02h | No request |
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| 12h | Read request |
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| 22h | Write request (word) |
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| 32h | Write request (double word) |
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| Receive data: |
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| Ctrl | Function |
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| 02h | Request not yet completed |
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| 12h | Read request or write request successfully completed (word) |
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| 22h | Read request or write request successfully completed (double |
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| word) |
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| 72h | Error message |
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| Only one request can be processed at a time. The slave provides the | ||||||||||||||||
| response until the master sends a new request. If a response includes | ||||||||||||||||
| parameter values, the slave responds with the current value in the | ||||||||||||||||
| case of a repetition. |
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| NOTE: Read requests are only executed by the slave if the value | ||||||||||||||||
| changes from 02h to 12h. Write requests requests are only executed | ||||||||||||||||
| by the slave if the value changes from 02h to 22h or to 32h. | ||||||||||||||||
Subindex | The byte "Subindex" must be set to the value 00h. | ||||||||||||||||
Index | The word "Index" contains the parameter address. | ||||||||||||||||
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| 0198441113843,V1.01,01.2012 |
| See the product manual for a list of the parameters. | ||||||||||||||||
26 |
