Register Descriptions; The Write Registers; The Read Registers; The Id Register - Agilent Technologies VXI bus E1476A User Manual

Register Descriptions

The WRITE
Registers
The READ
Registers

The ID Register

base + 15 14
00 16
Write
Read Manufacturer ID - returns FFFF 16 in Hewlett-Packard A16 only register based card
The Device Type
Register
base + 15 14
02 16
Write
Read
104 Register-Based Programming
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There are six WRITE and eight READ registers on the multiplexer. This
section contains a description of the registers followed by a bit map of the
registers in sequential address order. Undefined register bits appear as "1"
when the register is read and have no effect when the register is written to.
You can write to the following multiplexer registers:
•
Status/Control register (base + 04
•
Channels 0 through 15 Relay Control Register (base + 20
•
Channels 16 through 31 Relay Control Register (base + 22
•
Channels 32 through 47 Relay Control Register (base + 24
•
Channels 48 through 63 Relay Control Register (base + 26
•
Tree Relays 90 through 94 Control Register (base + 28
You can read the following multiplexer registers:
•
Manufacturer ID Register (base + 00
•
Device Type Register (base + 02
•
Status/Control Register (base + 04
•
Channels 0 through 15 Relay Control Register (base + 20
•
Channels 16 through 31 Relay Control Register (base + 22
•
Channels 32 through 47 Relay Control Register (base + 24
•
Channels 48 through 63 Relay Control Register (base + 26
•
Tree Relays 90 through 94 Control Register (base + 28
Reading the ID register returns FFFF
Hewlett-Packard and the module is an A16 register-based device. See
"Programming Example" to see how to read the ID Register.
13 12 11 10 9
Reading the Device Type Register returns 0218
device as the E1476A 64-Channel Multiplexer. See "Programming
Example" to see how to read the Device Type Register.
13 12 11 10 9
)
16
)
16
)
16
)
16
indicating the manufacturer is
16
8 7 6 5
Undefined
8 7 6 5
Undefined
0218 16
)
16
)
16
)
16
)
16
)
16
)
16
)
16
)
16
)
16
)
16
4 3 2 1 0
which identifies the
16
4 3 2 1 0
Appendix B