12.4.2 General ASD Access Notes

•Because write transactions targeting internally-defined points (refer to section 12.3.1) are handled locally within the ETH-100, data range checking is not available. For example, if a write to a point is performed, and the write data is out-of-range of the corresponding ASD register, no exception will be immediately returned. However, the point will always reflect the ASD register’s value. In other words, if such an out-of-range write is performed, the unsuccessful ASD write can be observed by reading the current (unchanged) value of the register during a subsequent transaction.

•For those drive families (such as the S7 and S9) which do not have an explicit FREQUENCY MODE SELECTION or COMMAND MODE SELECTION parameter setting corresponding to the common serial channel, remember that bits #14 and #15 of the communication command register (drive register 0xFA00) must be set to enable network frequency and network commands, respectively.

•All register writes use the drive’s RAM / EEPROM data write (“W”) command. For all writes that target the drive’s EEPROM, be sure to follow Toshiba’s guidelines regarding the number of times a specific parameter can be written without risk of EEPROM damage.

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