Fluke PM3370B user manual Acknowledge, Ok, normal situation Syntax error, Execution error

THE CPL PROTOCOL 6 - 47

6.6 ACKNOWLEDGE

The <acknowledge> is a synchronization reply that is returned after each command sent to the oscilloscope, signalling correct or incorrect operation:

"0"	Ok, normal situation
"1"	Syntax error	(ST query may give more info)
"2"	Execution error	(ST query may give more info)
"3"	Synchronization error
"4"	Communication error

Explanation and examples of the errors:

Syntax Error:

returned when the command is not understood by the oscilloscope for one of the following reasons:

*

*

Unknown header, wrong instructions

Data format of body is wrong, e.g. alpha characters when decimal data expected

Execution Error:

returned when internal processing is not possible:

*

*

Data out of (internal) range Conflicting oscilloscope settings

Synchronization Error:

returned when the oscilloscope receives a new command while it is still executing the previous one:

*a new command is sent without waiting for the <acknowledge> synchronization.

Communication Error:

returned when any framing, parity or overrun error occurs in the received data.

When an error is detected during the execution of the command:

--the oscilloscope sends an <acknowledge>,

--the oscilloscope terminates further execution of the command and returns to the idle state,

--the oscilloscope is then ready for a new command.