| Driver Manual |
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| Da_Byte_Name* | Names a data array that the driver will | One of the Data Array names | |
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| use to store poll/query response status | from “Data Array” section above | |
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| data. |
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| One data element is used per map |
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| descriptor. The element is determined |
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| by the Data_Array_Offset parameter. |
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| Data_Array_Offset | Starting location in Data Array | 0 to maximum specified in “Data | |
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| Array” section above | |
| Function | Function of Client Map Descriptor | RDBC, WRBC, WRBX | |
4.4.2Driver Related Map Descriptor Parameters
Column Title | Function | Legal Values |
Node_Name | Name of Node to fetch data | One of the node names |
| from | specified in “Client Node |
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| Descriptor” above |
Address* | This field is only required if the | 1..16 |
| address/length method of | Indicating 1st to 16th module |
| module position specification is | |
| used. | position. |
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Length | Length of Map Descriptor | 1 - 1000 |
| Only some commands / queries |
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| use the value of this map |
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| descriptor parameter. This is |
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| indicated in a table provide in |
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| chapter 6. |
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| For those commands and |
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| queries that do use the Length |
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| parameter the driver never uses |
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| more than 16 elements of data |
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| even if the length is set to a |
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| larger number. |
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| Although this driver does not |
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| use the length parameter for |
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| some commands the |
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| FieldServer kernel does use |
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| this parameter to ensure that no |
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| more than one client map |
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| descriptor has control of a |
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| range of array data elements. |
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| For this reason it is best to |
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| always specify the length – in |
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| these cases set it to 1. |
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