5.6 Start Measurement Command with Checksum: aMC!

This command is identical to the aM! command with the exception that a three-character checksum is returned before the <CR><LF> as part of the Send Data command reply. The aMC1 to aMC9 commands are reserved for future use.



Checksum is a form of redundant test, which is used to check for any errors in the data.