Keysight E1458A Register Information; Using This Appendix; Addressing The Registers - Keysight VXI Bus 75000 C Series User And Programming Manual

Keysight E1458A 96-Channel Digital I/O Module
User Guide
B Keysight E1458A Register
Information

Using This Appendix

The contents of this appendix are:

Addressing the Registers

To access a specific register for either read or write operations, the address of the
register must be used. Register addresses for the plug-in modules are found in
an address space known as VXI A16. The exact location of A16 within a VXIbus
master's memory map depends on the design of the the VXIbus master you are
using. For the Keysight E1405/E1406 Command Module, the A16 space location
starts at 1F000016.
The A16 space is further divided so that the modules are addressed only at
locations above 1FC00016 within A16. Further, every module is allocated 64
register addresses (4016). The address of a module is determined by its logical
address (set by the address switches on the module) times 64 (4016). In the case
of the Keysight E1458A Digital I/O Module, the factory setting is 144 or 9016, so
the addresses start at 1FE40016.
Register addresses for register-based devices are located in the upper 25% of
VXI A16 address space. Every VXI device (up to 256) is allocated a 64-byte block
of addresses.
Figure B-1 shows the register address location within A16. Figure B-2 shows the
location of A16 address space in the Keysight E1405/E1406 Command Module.
– Addressing the Registers
– Reset and Registers
– Register Definitions
– A Register-Based Output Algorithm
– A Register-Based Input Algorithm
– Programming Example
Do not mix register programming and SCPI command
programming.
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