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Appendix C: Instrument I/O Operation
C–2
VX4101A MultiPaq Instrument User Manual
As with all VXIbus devices, the VX4101A Module has registers located within a
64 byte block in the A16 address space. The base address of the VX4101A
device registers is determined by the device unique logical address and can be
calculated as follows:
Base Address = V
16
*40
16
+ C000
16
where V is the logical address of the device as set by the Logical Address
switches.
Configuration Registers
Table C–1 contains a list of the VX4101A Configuration registers and a
complete description of each register. The offset is relative to the module base
address.
Table C–1: Register Definitions
Register
Address
(hexadecimal)
Type Value (Bits 15-0)
ID Register 0000 RO 1001 1111 1111 1101 (hexadecimal 9FFD)
Device Type 0002 RO 0111 0111 1001 1010 (hexadecimal 779A)
Status 0004 R Defined by state of interface
Control 0004 W Defined by state of interface
Offset 0006 WO Assigned by Resource Manager
Protocol 0008 RO 1011 0111 1111 1111 (hexadecimal B7FF)
Response 000A RO Defined by state of the interface
Data High 000C Not used
Data Low 000E W Not fixed; command-dependent
Data Low 000E R Not fixed; command-dependent
RO is Read Only
WO is Write Only
R is Read
W is Write