Reserved Bytes; Flag Byte; Correlation Id (Cid) - Ricoh MP 6002 User Manual

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1. IPDS Overview

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.

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

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.

DATA - The specific

operands, parameters

and/or data fields as

appropriate for the given

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