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5. Reading Sequence and Format. When this program executes, the
readings are transferred to the memory card and later displayed in the
following sequence:
GENerator digitizer reading 1
GENerator digitizer reading n
.
.
APPender digitizer reading 1
APPender digitizer reading n
The memory card was set up to store the readings in the digitizer’s packed
data format. The packed readings are signed, 16-bit numbers preceded by
the ANSI/IEEE Standard 488.2-1987 Definite Length Arbitrary Block
header. Packed readings are always numbers between -1.0230 (-2046) and
+1.0235 (2047). To convert the readings to voltages, each reading is divided
by 16 to remove the data label bits (0 - 3), and is multipled by 0.0025 (the
reading resolution for the 5V range).
6. Additional Information. Additional information on Local bus operation
and on the Local bus commands can be found in Chapter 3 - "Understanding
the Digitizer", and in Chapter 4 - "Command Reference."
LBUSAUTO.C This program transfers readings over the Local bus from two digitizer A/Ds
to the HP E1488 memory card. The program shows how the digitizers are
used in the Local bus GENerate and INSert modes. The program is similar
to the previous program; however, rather than INITiate each digitizer
individually, the INSerter digitizer INITiates the GENerator digitizer once
the INSerter digitizer readings are complete.
/* LBUSAUTO.C - This program demonstrates how to transfer readings over the */
/* Local bus from two digitizer A/Ds to the HP E1488 memory card. The leftmost */
/* digitizer is set to the GENerate mode and the inner digitizer is set to the */
/* INSert mode. The generator digitizer is armed from the TTLT0 trigger line */
/* when the inserter digitizer has completed its measurements. */
/* Include the following header files */
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <malloc.h>
#include <cfunc.h> /* This file is from the HP-IB Command Library Disk */
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Chapter 2 Usin
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