Appendix D. Modbus application
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38
20
01
Invalid data size (valid range 0x07 … 0xF5)
02
Not specified reference type
Failed to open the file for reading (may be nonexistent)
03
Failed to move to the desired offset in the file
04
Error while deleting file on delete request
Too much data requested (more than 250 bytes)
Invalid record number (greater than 0x270F)
Invalid record length (greater than 0x7A)
21
01
Invalid data size (valid range 0x09 ... 0xFB)
02
Not specified reference type
Failed to open the file for writing
04
Nonexistent file requested
Read-only file requested
Failed to write the required number of bytes
