9.3.5 C-ECHO Protocol

9.3.5 C-ECHO Protocol (Current)
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The information necessary for the C-ECHO request and indication DIMSE-C primitives are conveyed in the C-ECHO-RQ Message. The information necessary for the C-ECHO response and confirmation DIMSE-C primitives are conveyed in the C-ECHO-RSP Message.

9.3.5.1 C-ECHO-RQ

The C-ECHO-RQ Message contains fields as defined in Table 9.3-12. Each field shall conform to DICOM encoding and Value Representation as defined in PS3.5. Fields are required as specified in the C-ECHO service definition unless otherwise noted in Table 9.3-12. Fields not specified in the C-ECHO service definition but present in Table 9.3-12 are required by the DIMSE-C protocol.

Table 9.3-12. C-ECHO-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.
Affected SOP Class UID	(0000,0002)	UI	1	SOP Class UID associated with this operation.
Command Field	(0000,0100)	US	1	This field distinguishes the DIMSE-C operation conveyed by this Message. The value of this field shall be set to 0030H for the C-ECHO-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 no Data Set is present in the Message and shall be set to a value of 0101H.

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9.3.4.4 C-MOVE Protocol Procedures	Home	9.3.5.2 C-ECHO-RSP