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2. Execute the following HP E1406 Command Module command:
VXI:CONFigure:DeviceLIST? <logical_address>
The C language example programs disk contains the program
Query.C. By changing the line:
#define ADDR 70905L (E1429 digitizer address)
to:
#define ADDR 70900L (E1406 address)
and entering the command:
VXI:CONF:DLIS? 40(or the current E1429 logical address)
a program string similar to the following is returned when the
program executes:
vxi:conf:dlis? 40 = +40,+0,+4095,+448,+1,+0,MSG,A24,
#H00220000, #H00001000,Ready,"","","",MBinstr INSTALLED AT
SECONDARY ADDR 5"
The hexadecimal number in bold is the digitizer’s A24 base address.
3. Read the digitizer’s offset register in A16 address space. As shown in
Figure 3-12, the Offset register is one of the digitizer’s configuration
registers.
In a system where the HP E1406 Command Module allocates address
space, the A16 base address of the configuration registers is
computed as:
1FC000
16
+ (LADDR * 64)
16
2,080,768 + (LADDR * 64)
where 1FC000
16
is the starting location of the configuration register
addresses, LADDR is the digitizer’s logical address, and 64 is the
number of address bytes in A16 per VXI device.
The digitizer’s factory set logical address is 40. If this address is not
changed, the base address of the digitizer’s configuration registers in
A16 is:
148 Understandin
g
the HP E1429 Di
g
itizer Chapter 3