Hitachi S10mini Hardware Manual page 54

Return Codes
=0: Normal termination
=/FFFFFFFF: Abnormal termination
=/80000000: Input parameter error
An input parameter error results when the mdl, sid, net, or len parameter is outside
the range or when the station number of the slave parameter table (SVPT) is not
registered.
Error information is stored in the error code area of the S-table and the error flag
of the NET status.
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4 USER GUIDE