FET Multiplexer Registers
There are five READ and six WRITE registers on the FET strain gage
multiplexer.
The READ Registers
The following READ registers are located on the FET strain gage
multiplexer.
•
ID Register (base + 00
16
)
•
Device Type Register (base + 02
16
)
•
Status Register (base + 04
16
)
•
Scan Control Register (base + 06
16
)
•
Scan Channel Delay Register (base + 08
16
)
ID Register
The FET multiplexer’s ID Register indicates the classification, addressing
mode, and manufacturer of the device.
base + 00
16
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
Read
Device Class
Address
Mode
Manufacturer ID
Device Class
Device Classification. Bits 15 and 14 classify a device as one of the
following:
0
0
memory device
0
1
extended device
1
0
message-based device
1
1
register-based device
The HP E1357A/E1358A FET Strain Gage Multiplexers are register-based
devices.
Address Space
Addressing Mode. Bits 13 and 12 indicate the addressing mode used by
the device:
0
0
A16/A24 address mode
0
1
A16/A32 address mode
1
0
RESERVED
1
1
A16 address mode
The HP E1357A/E1358A FET Strain Gage Multiplexers use the A16
address mode.
126 Strain Gage Register-Based Programming
Appendix D
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