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The equipment command segment contains the information required to notify the receiving component what is to happen.

HL7 Attribute Table - ECD - Equipment Command Segment

Seq#	DataElement	Description	Must Implement	Flags	Cardinality	Length	C.LEN	Vocabulary	DataType
ECD
1	01390	Reference Command Number	SHALL	=	[1..1]		10		NM
2	01391	Remote Control Command	SHALL		[1..1]			0368 Remote Control Command	CWE
3	01392	Response Required			[0..1]	[1..1]		0136 Yes/no Indicator	ID
4	01393	Requested Completion Time	SHALL NOT	W	[0..0]
5	01394	Parameters			[0..*]				TX

Definition: This field contains the unique identifier for this particular command that should be used by the various components for future referral to this command. It is similar to the concept of MSH-10 Message Control ID, but at the equipment command/response level. This number is generated by the originator of this command.

Definition: This field identifies the command that the component is to initiate. Refer to User-defined Table 0368 – Remote Control Command in Chapter 2C, Code Tables, for valid values. Refer to LECIS standard for details.

Definition: This field identifies the mode of synchronization that is to be used in relation to the execution of the command. "Y" (Yes) means that the response is required immediately after execution; "N" (No) response is not required at all. Refer to HL7 Table 0136 – Yes/no Indicator for valid values.

Attention: As of version 2.5 this fieldwas retained for backward compatibility only and withdrawn as of v2.7. The TQ data type was deprecated; see Chapter 2A, section 2.A.81. Instead use the "Explicit time" (TQ1-4) or "Relative Time and Units" (TQ1-5) fields of the TQ1 segment in a message using ECD segment.

Definition: This field identifies the parameters of the command (if they are not included in a separate segment(s)).