Fluke PM3370B user manual Acknowledge, Responses, Data Separators, Program data separator

6 - 2 THE CPL PROTOCOL

There are several IMPLICIT QUERY commands, which means that the oscilloscope will send data back (i.e., respond) to the computer after receiving and executing the command.

Acknowledge

The <acknowledge> is an automatic response from the oscilloscope to let the computer know that the received command has been executed. The <acknowledge> also contains information about how the command was executed.

An <acknowledge> is always followed by a CR. For more information, see section

6.6ACKNOWLEDGE.

Responses

The format of the response data depends on the command which invoked the response. When several values or strings are returned they are always separated with a RESPONSE DATA SEPARATOR which is a comma ("," = ASCII 44). To signal the end of the response a RESPONSE MESSAGE TERMINATOR

CR (ASCII 13) is sent.

Data Separators

Data Separators are used between parameters sent to the oscilloscope and between values and strings received back from the oscilloscope. The following list gives the possibilities for data separators:

program data separator

space	SP	(ASCII 32)	*)
tab	HT	(ASCII 9)	*)
comma	,	(ASCII 44)

*) more than one space or more than one tab can be used as a separator

response data separator

comma , (ASCII 44)

Message Terminators:

At the end of a command or response a terminator must be sent. For both programming and response messages the terminator has been defined as:

program message terminator

carriage return CR (ASCII 13)

response message terminator

carriage return CR (ASCII 13)