Omron CQM1H-SCB41 operation manual Appendix B, Command Frame Contents, Response Frame Contents

CompoWay/F Master Protocol				Appendix B
	Command Frame Contents
			Item	Meaning
		STX		A code, 02 Hex, indicating the beginning of a communications
				frame (text). This code must always be set as the first byte.
		Node number		The node number identifies the source of the command frame.
				Specify “XX” to broadcast a transmission. There will be no response
				made to a broadcast.
		Subaddress		Set “00” for most components. Other values must be set for special
				components.
		SID		Set “0” for most components. Other values must be set for special
				components.
		Command and text		The command and required text are placed here. Refer to the
				command codes and text for individual sequences.
			MRC and SRC	The command code specifies the service being used. Refer to the
				command codes and text for individual sequences.
		ETX		A code, 03 Hex, indicating the end of text.
		BCC		The block check character (horizontal parity, 1 byte). The character
				is an exclusive OR of all data from just after the STX to the ETX.
	Response Frame Contents
			Item	Meaning
		STX		A code, 02 Hex, indicating the beginning of a communications
				frame (text). This code must always be set as the first byte.
		Node number		The node number identifies the source of the command frame. “XX”
				is specified to broadcast a transmission. There will be no response
				made to a broadcast.
		Subaddress		“00” for most components. Other values must be set for special
				components.
		SID		“0” for most components. Other values must be set for special
				components.
		End code (See note.)		The results of executing the command frame.
				Note: The response code (MRES and SRES) indicates the results
				for the command code; the end code indicates the results for the
				command frame. These are not the same.
		Response and text		The response and requested text are placed here. Refer to the
				response and text for individual sequences.
			MRES and SRES	The response code specifies the results of processing the service
				requested by the command code. Refer to the response codes and
				text for individual sequences.
		ETX		A code, 03 Hex, indicating the end of text.
		BCC		The block check character (horizontal parity, 1 byte). The character
				is an exclusive OR of all data from just after the STX to the ETX.

139