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 PS 3.5. 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 9.3-13 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 which 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.|