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9. Parameter Numbering

Inspection of the Toshiba ASD user’s manual reveals that the ASD’s parameters are organized as hexadecimal numbers ranging from F000 to FFFF. These parameters are made accessible to the interface board as “registers”, and are numerically remapped to present a more natural interface to the communications user. There are 1500 total registers available via the interface board, and their mappings are as shown in Table 1.

Table 1: ASD Parameter-to-Register Mapping

Hexadecimal ASD

…Map to Decimal Register

Parameter Numbers…

Numbers

F000

- F999

1 - 1000

FA00

- FA99

1001 - 1100

FB00

- FB99

1101 - 1200

FC00

- FC99

1201 - 1300

FD00

- FD99

1301 - 1400

FE00

- FE99

1401 - 1500

This mapping is easier to understand if one just uses the interface's web page as a guide (refer to Figure 6 and section 10.4.4). The "parameter” numbers (ASD references) and "register” numbers (network references) for all available parameters are shown in the first two columns. Commanding the drive over the network therefore entails writing to registers 1007 (option board command 1) and 1008 (option board frequency command), which correspond to ASD parameters FA06 and FA07, respectively.

Figure 6: Web Page Register Assignment Reference

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