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Setting the Local
Bus Data Source
The source of the readings transferred over the Local bus is set with the
command:
VINStrument[:CONFigure]:LBUS:FEED <
source
>
The <source > parameters follow. Sources beginning with "MEMory: " are
the post measurement sources, sources beginning with "CONVerter:" are
the real time (A/D) sources. The Local bus data source is independent of
any Local bus transfer mode.
" MEMory:CHANnel1" : Channel 1 memory is the data source for the
Local bus. Two bytes per reading will be output to the bus.
" MEMory:CHANnel2" : Channel 2 memory is the data source for the
Local bus. Two bytes per reading will be output to the bus.
" MEMory:BOTH" : Both channels of memory are the data source for the
Local bus. In this mode, the channel 2 reading is output first, followed by
the channel 1 reading. With two bytes per reading, four bytes for each set of
readings will be output to the bus.
" CONVerter:CHANnel1" : The channel 1 A/D converter is the data
source for the Local bus. Two bytes per reading will be output to the bus.
" CONVerter:CHANnel2" : The channel 2 A/D converter is the data
source for the Local bus. Two bytes per reading will be output to the bus.
" CONVerter:BOTH" : Both A/D converters are the data source for the
Local bus. In this mode, the channel 2 reading is output first, followed by
the channel 1 reading. With two bytes per reading, four bytes for each set of
readings will be output to the bus.
Local Bus Data Format Data is transferred (real time or post measurement) over the Local bus in the
digitizer’s packed (A/D) format. Data is transferred one byte at a time in the
following sequence:
Two Channels: channel 2 MSByte
channel 2 LSByte
channel 1 MSByte
channel 1 LSByte
One Channel: channel n MSByte
channel n LSByte
Chapter 3 Understanding the HP E1429 Digitizer 163