Agilent Technologies L4400 manual Deleting Traces, Buffered Memory Input

8L4450A 64-Bit Digital I/O with Memory and Counter

You can also output the trace one sample at a time on the data lines using the SOURce:DIGital:MEMory:STEP command. This command outputs one sample and then puts the memory in the stopped state. The STEP command also overrides the interrupt line so it can be used to trigger a transfer even if the interrupt line is set to be the trigger source.

Deleting Traces

You can delete traces in memory to recover the memory space. Use the TRACe:DELete:NAME command to delete a specific trace. Note that deleting a specific trace does not de- fragment the memory. You can delete all traces using the TRACe:DELete:ALL command.

Buffered (Memory) Input

Each bank on the L4450A has its own memory for use in buffered transfers. Changing a bank from an output to an input will clear all memory for that bank. The general steps to use input memory are:

1Set the channel width and parameters.

2Set the handshake mode.

3Set the number of samples to collect.

4Start the capture.

5Check the status of the transfer.

6Retrieve the captured data.

Set the channel width and direction. set the channel width, direction, basic input operations.

Use the CONFigure:DIGital command to thresholds, and polarity. See page 200 for

Set the handshake mode. You must use synchronous handshaking mode. Handshaking is described in more detail on page 203.

Set the number of samples to collect. The SENSe:DIGital:MEMory:SAMPle:COUNt command sets the number of samples to capture. If you set the number of counts to infinite (0 = default), the bank will capture data until a STOP is received. Older samples are overwritten if memory gets full. Allowed sample counts depend upon the channel width as follows:

•BYTE (8- bit) 1 to 65535

•WORD (16- bit) 1 to 65535

•LWORd (32- bit) 1 to 32767

Start the capture. The SENSe:DIGital:MEMory:STARt command sets the channel to begin the data capture. The capture begins when the handshake occurs.

212 L4400 User’s Guide