10.3.3 N-SET Protocol
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### 10.3.3 N-SET Protocol

The information necessary for the N-SET request and indication DIMSE-N primitives are conveyed in the N-SET-RQ Message. The information necessary for the N-SET response and confirmation DIMSE-N primitives are conveyed in the N-SET-RSP Message. Fields not specified in the N-SET service definition but present in Table 10.3-3 are required by the DIMSE-N protocol.

#### 10.3.3.1 N-SET-RQ

The N-SET-RQ Message contains fields as defined in Table 10.3-5. Each field shall conform to DICOM encoding and Value Representation as defined in PS3.5. Fields are required as specified in the N-SET service definition unless otherwise noted in Table 10.3-5. Fields not specified in the N-SET service definition but present in Table 10.3-5 are required by the DIMSE-N protocol.

Table 10.3-5. N-SET-RQ Message Fields

Message Field | Tag | VR | VM | Description of Field
--- | --- | --- | --- | ---
Command Group Length | (0000,0000) | UL | 1 | The even number of bytes from the end of the value field to the beginning of the next group.
Requested SOP Class UID | (0000,0003) | UI | 1 | SOP Class UID of the SOP Instance for which Attribute values are to be modified.
Command Field | (0000,0100) | US | 1 | This field distinguishes the DIMSE-N operation conveyed by this Message. The value of this field shall be set to 0120H for the N-SET-RQ Message.
Message ID | (0000,0110) | US | 1 | Implementation-specific value that distinguishes this Message from other Messages.
Command Data Set Type | (0000,0800) | US | 1 | This field indicates that a Data Set is present in the Message. It shall be set to any value other than 0101H (Null).
Requested SOP Instance UID | (0000,1001) | UI | 1 | Contains the UID of the SOP Instance for which Attribute values are to be modified.
Modification List | (no tag) | - | - | This field is encoded as a Data Set. One Data Element is encoded for each Attribute and Attribute Value applicable to the operation.

### Note

The permitted contents of Modification List, encoded as a series of Data Elements, are defined in the Information Object Definition (PS3.3) and Service Class Specifications (PS3.4).

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