West Control Solutions N8080 (for 2xxx) - Manual (Page 16)

3.4 ERROR CONDITIONS
If a slave device detects a syntax error or parity error, it will not reply to the
message; the master device should make up to two retries, applying the
two-second No Reply timeout in each case.
Parameter Read operations with parameter identifiers which are in the legal
range but which are not applicable to the addressed instrument will have no
effect on any parameter values and a positive acknowledgement will be
returned.
Parameter Write operations with parameter identifiers which are outside the legal
range will be considered to be syntax errors; no reply will be generated.
Parameter Write operations in which the specified parameter is valid but the
specified value is invalid will generated a negative acknowledgement.
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