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6. In order to perform another parameter read or write, the master must once again send a “no action” code (Req1=0 and Req0=0), and the Multicom interface must once again respond with an idle state acknowledge (Resp1=0 and Resp0=0) before the next read or write action can take place. Until a “no action” code is sent to the Multicom interface, the interface will ignore all data in the action bits, parameter number and parameter write data words. Also, as long as the master sends the “no action” code, the Multicom interface will loop-back in the parameter number response word and parameter data / error code response word whatever data is sent to it in the corresponding output words.
9.6.4 Register Access Error Codes
When a parameter read or write error occurs, one of the following error codes will be returned in the parameter data response word:
Error Code
Meaning
0x0000 ..................... cannot execute (access error)
0x0001 ..................... data error (written data value outside of valid range)
0x0002 ..................... invalid parameter number
0x0064 ..................... attempt to write to a read-only parameter
0x0065 ..................... attempt to read from a write-only parameter
0x0066 ..................... other / unclassified error
9.7 Parameters
The parameters that can be accessed via the parameter access method outlined in section 9.6 are defined in the Toshiba ASD Operation Manual and/or the ASD Serial Interface Manual. The accessible parameters, their access behaviors and data ranges may vary depending on the drive’s firmware revision.
The following parameters, which are not implemented in the drive, are used to access local information on the Multicom interface:
Parameter Function Read / Write Adjustment Range
0xFC82
Multicom interface firmware version/revision
Read only
High byte = firmware version
Low byte = firmware revision
If an attempt is made to write to this register, error code number 0x0064 (WRITE_TO_READONLY) will be returned in the parameter data/error code field of the acyclic data.
G7 ASD Multi-Protocol Communication Option and PG Feedback Option Manual 35
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