Offset Range Meaning Error Code
7 DATA - The specific
operands, parameters
and/or data fields as
appropriate for the given
command.
Reserved Bytes
Throughout the command descriptions in the following chapters, some data fields, bytes, and bits are
specified as reserved.
When the description for a reserved field, byte, or bit specifies "should be zero," the printer does not
check the contents of the bytes or bits. The reserved data should be set to zero, because they could be
defined in future changes to the printer. However, non zero values do not cause an error and are
ignored by the printer.
When the description for a reserved field, byte, or bit specifies it "must be zero," the printer checks the
contents of the bytes or bits and will return error status to the host if the field contains a non zero value.
Flag Byte
Bit 7 is the Persistent NACK bit for 3270 Non-SNA DSC (Data Stream Compatibility) Mode NACKs.
This bit has no meaning in other attachment environments.
Valid values for the Acknowledge Reply Flag byte are described in the Intelligent Printer Data Stream
Reference.
Correlation ID (CID)
The correlation ID (CID) is an identifier of a specific instance of an IPDS command.
It is used to correlate errors with the command that generated them.
It is not possible to correlate all errors with particular IPDS commands. Mechanism errors (for example,
out of paper position checks and unpopulated character positions in resident fonts) are never correlated.
Therefore, it is possible for some NACKs to be returned without correlation numbers even if all
downstream commands had correlation numbers.
1. IPDS Overview
22
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