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Note The following information on determining register addresses is based on the
computer configuration shown in Figure C-1, and on address mapping as
performed by the HP E1406 Command Module’s resource manager. For
configurations with embedded controllers or configurations with a resource
manager other than the HP E1406 Command Module, refer to those
manuals containing information on A24 address mapping.
Determining the
A24 Base Address
When you are reading or writing to a digitizer register, a hexadecimal or
decimal register address is specified. An A24 register address is:
A24 register address = A24 base address + register offset
There are three ways to determine the digitizer’s A24 base address:
1. Note the base address assigned by the resource manager at power-on.
The HP E1406 resource manager configuration sequence can be
monitored using an RS-232 terminal or printer. The "C-Size VXIbus
Systems Installation and Getting Started Guide" contains information
on connecting a terminal.
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"
344 Register Programming Appendix C