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Appendix A. Advanced Topics
Appendix A.1. Writing to DX9100 Binary Outputs
When writing to DX9100 Binary Outputs, it is important to understand that each binary output has three bits associated with it as described in the table below:
Bit | Description | Address6 |
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Output | The status bit will indicate the actual status of the output in the field. This bit cannot be | Address 5 |
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status bit | modified by the FieldServer as it is read only, and is meant for actual status display. |
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Output | The control bit will allow the FieldServer to write a command to the DX9100 for the associated | Low | byte | of |
control bit | output. This command will only execute if the override is enabled by the override bit. | Address 1 |
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Override bit | The override bit must be set to enable an output to be written to by the FieldServer. If this is | High | byte | of |
not set, then the control bit will be ignored. | Address 1 |
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Example
The example below better illustrates the mapping that is typically needed to deal with DX9100 Binary Outputs. Note that since all 6 outputs are packed into word format when transmitted, a Packed_Bit Array is typically required to access the bits individually. In this Example, the status for
Data_Arrays |
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Data_Array_Name, | Data_Format, | Data_Array_Length |
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DA_PO1_01 | , | Packed_Bit , | 100 |
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DA_PO1_02 | , | Packed_Bit , | 100 |
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Map_Descriptors |
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Map_Descriptor_Name, | Data_Array_Name, | Data_Array_Offset, | Function, | Node_Name, | Address, | Scan_Interval | |||
CMD_DO1_05 , | DA_PO1_01 , | 0 | , | Rdbc , | Dev_30 , | 0001 , | 1.0s | // | DO3 - DO8 Set and Enable |
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CMD_DO1_06 , | DA_PO1_02 , | 0 | , | Rdbc , | Dev_30 , | 0005 , | 1.0s | // | DO3 - DO8 Status |
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6Binary Outputs start at address 3, so the first bit of each of these addresses will represent B03
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