Setting the Local Bus Transfer Mode

The Local bus transfer mode is set with the command:

VINStrument[:CONFigure]:LBUS[:MODE] <mode >

The <mode > parameters are:

APPend: Local Bus data is received from the left, and passed on to the right until an end of frame is detected. When end of frame is received from the left side, all data from this module is appended, followed by an end of block marker and a new end of frame. After sending the end of frame marker, the module enters the paused state. This mode requires a module to the left that is in GENerate mode. The mode is not active until either an INITiate command or a VINStrument:LBUS:MEMory:INITiate command is sent.

GENerate: Local bus data originates in this module and is passed to the right, followed by an end of frame marker. The mode is not active until either an INITiate command or a VINStrument:LBUS:MEMory:INITiate command is sent.

INSert: Local bus data is inserted onto the bus from this module. The module will place its data out onto the Local bus with an end-of-block flag at the end. The module will then pass through (pipeline) any data it receives from the left, and will enter the paused state when an end-of-frame flag is received from the left. This mode requires at least one module to the left which is in GENerate mode. The mode is not active until either an INITiate command or a VINStrument:CONFigure:LBUS:MEMory:INITiate command is sent.

OFF: The Local bus interface is disabled immediately upon receipt of this command. Local bus data is neither used nor passed through.

PIPeline: Local bus data is passed through and not altered. This mode becomes effective immediately upon receipt of this command. Select this mode when data should be transparently passed through the

HP E1429B. The module will remain in the PIPeline mode even after an end-of-frame flag is received; therefore, it is necessary to change modes to take the module out of PIPeline mode.

162 Understanding the HP E1429 Digitizer

Chapter 3

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HP E1429A manual Setting the Local Bus Transfer Mode