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Types of Registers
Addressing the Registers
Relay Driver Register Definitions
The Relay Driver Module is a register-based slave device. There are 72
independent relay drivers on the card that are controlled using the Relay
Driver registers. There are five register types on this module.
Register
ID Register
Device Type
Register
Status/Control
Register
Configuration
Registers
Channel Enable
Registers
Note
If SCPI or VXIplug&play is used to control this module, register
programming is not recommended, since these drivers maintain an image
of the card state. If the card state is altered by using register writes, these
drivers will be unaware of these changes.
To read or write to specific registers you must address a particular register
within a module. The registers within a module are located using a fixed
offset. The module address is based up the module's logical address. There
are two basic ways of accessing registers:
•
Register Access with Logical Address: This method uses the logical
address directly to access a particular card using VXI:READ and
VXI:WRITE commands through a command module.
•
Register Access with Memory Mapping: This method can be used
with an embedded controller that locates A16 data space within its
memory map. The memory mapping allows registers to be directly
read or written with moves to/from memory.
Description
Identifies Agilent Technologies as the manufacturer, and the
card is an A16 register-based device.
Identifies card as an Agilent E1339A or Agilent Z2309A.
When read, is used to return device specific status
information. When written to, is used to set control bits.
These three registers are used to configure the module
for different operating characteristics when used with the
downloaded SCPI driver or with the VXIplug&play driver.
These six registers control the state of the relay drivers on
the module.
Relay Driver Register Definitions
Appendix B
95
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