Fluke PM-3394B, PM-3380B Writing data to trace memory, Send → TRACe? CH3, ’Queries for CH3 trace

USING THE COMBISCOPE INSTRUMENTS 3 - 59

3.10.3Writing data to trace memory

The TRACe command allows you to write data from the controller into a memory register. The following possibilities are available:

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Write a previously read trace using the TRACe? query.

Example:
Send → TRACe? CH3	’Queries for CH3 trace
Read ← <trace block>	’Reads trace data block

Send → TRACe M2_3,<trace block> ’Writes data block to M2_3

The result is that trace area M2_3 is filled with the acquisition trace of channel 3.

Programming note:

The fixed command part (TRACe M2_3,) and the variable <trace block> must be sent separately. So, no EOI (End Or Identify) detection in between. Also the <trace block> must be sent without EOI detection and detection of the EOL (End Of Line) code, because the <trace block> could contain the EOL character, e.g., code 10 for CR.

Write a trace of identical constants (range = -32767 ... 32767).

Example:

Send → TRACe M2_4,1028’1028 = 1024 + 4 = 0404 hex.

This command fills all memory register M2_4 locations with the constant 0404 hexadecimal for 16-bit samples, and with 04 hexadecimal for 8-bit samples.

Note: A trace can only be written to memory register space (Mi_n) and not to acquisition space (CHn).

PROGRAM EXAMPLE:

DIM response AS	STRING * 2000		’Dimensions trace buffer
CALL Send(0, 8,	"TRACe? CH1",	1)	’Requests for channel 1 trace
CALL Receive(0,	8, response$,	256)	’Reads the channel 1 trace
length = IBCNT%			’IBCNT = number of data bytes
CALL Send(0, 8,	"TRACe M2_3,", 0)		’Sends fixed command part without EOI
CALL Send(0, 8,	LEFT$(response$,length), 0)
			’Sends variable <trace block> without EOI
CALL Send(0, 8,	"", 1)		’Sends dummy string with EOI detection