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A16 Address Space
Inside the
Command Module
or Mainframe
When the A16 address space is inside the command module or mainframe
(Figure B-2), the multiplexer’s base address is computed as:
1FC000
16
+ (LADDR * 64)
16
or
2,080,768 + (LADDR * 64)
where 1FC000
16
(2,080,768) is the starting location of the VXI A16
addresses, LADDR is the multiplexer’s logical address, and 64 is the
number of address bytes per register-based device. Again, the multiplexer’s
factory set logical address is 112. If this address is not changed, the
multiplexer will have a base address of:
1FC000
16
+ (112 * 64)
16
1FC000
16
+ 1C00
16
= 1FDC00
16
or
2,080,768 + (112 * 64)
2,080,768 + 7,168 = 2,087,936
Register Offset The register offset is the register’s location in the block of 64 address bytes.
For example, with a LADDR of 112 the multiplexer’s Scan Channel Delay
Register has an offset of 08
16
. When you write a command to this register,
the offset is added to the base address to form the register address:
DC0016 + 0816 = DC08
16
(A16 outside the command module)
1FDC00
16
+ 08
16
= 1FDC08
16
(A16 inside the command module)
or
56,320 + 8 = 56,328 (A16 outside the command module)
2,087,936 + 8 = 2,087,944 (A16 inside the command module)
122 Strain Gage Register-Based Programming Appendix D
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- Contents 2
- WARNINGS 9
- Documentation History 9
- Safety Symbols 9
- BUSINESS REPLY MAIL 12
- Multiplexers 14
- Identifying the 15
- Terminal Module 15
- Setting the Card ID 17
- Selecting the 18
- Interrupt Line 18
- Internally Supplied 19
- Bridge Excitation 19
- Strain Gage 20
- Multiplexer 20
- Configurations 20
- Instrument 22
- Addressing 22
- Connecting the 23
- Chapter 2 24
- About This Chapter 24
- Terminal Module Configuration 24
- Bridge Selection 25
- Voltage Terminals 25
- Wiring a Terminal Module 27
- Strain Gage Wiring Diagrams 28
- 1/4 Bridge Diagrams 29
- 1/2 Bridge Diagrams 30
- Full Bridge 31
- Diagrams 31
- Connecting Relay 32
- Multiplexers to an 32
- External Voltmeter 32
- Connecting FET 33
- Chapter 3 34
- Dynamic Strain Measurements 38
- Rosette Measurements 40
- DISP "" 42
- Continued on Next Page 45
- Comments 48
- • This program makes 48
- Chapter 4 50
- Making Strain Measurements 50
- Unbalanced Bridge 51
- Measurement 51
- Technique 51
- Downloaded 52
- Unstrained 52
- References 52
- Equations 53
- Block Diagram 54
- Description 54
- The Wheatstone 55
- 120Ω and 350Ω 56
- MULTIMETER 57
- (VIA ANALOG BUS) 57
- Figure 4-7. The Wagner Ground 58
- 1/4 Bridge 59
- Measurements 59
- (QUARter) 59
- 1/2 Bridge 60
- Poisson 1/2 Bridge 61
- (HPOisson) 61
- Dummy Gage 61
- Bridge (FBPoisson) 63
- Bending Poisson Full 63
- Poisson Full Bridge 64
- (FPOisson) 64
- Reference 66
- SCPI Command Reference 68
- Numeric 1 - 32767 70
- CALibration 71
- CONFigure 72
- Numeric 1 - 99 74
- Boolean 0 75
- INITiate 76
- Subsystem Syntax MEASure 78
- [ROUTe:] 81
- Numeric cc00 - cc15 83
- Discrete NONE 86
- Discrete ABUS 87
- [SENSe:] 89
- Numeric as measured 91
- Numeric 00 - 07 91
- Numeric 1 to 32768 92
- Numeric 1 to 99 93
- Numeric 1 to 99 94
- Example Query Trigger Source 98
- IEEE 488.2 Common Commands 99
- Command Quick Reference 100
- Specifications 102
- Relay Life 104
- Appendix B 106
- Material Tables 107
- Strain Gage Diagnostics 108
- Leadwire Resistance 109
- Internal Half Bridge Voltage 112
- Shunt Verification 114
- Procedure 116
- Guard Voltage 117
- !Print the guard voltage 118
- Bridge Excitation Voltage 119
- Appendix D 120
- About This Appendix 120
- Register Addressing 121
- A16 Address Space 123
- Inside the 123
- Command Module 123
- Register Descriptions 124
- Relay Multiplexer Registers 124
- Device Type 125
- Register 125
- FET Multiplexer Registers 127
- Scan Control 129
- Scan Channel 129
- Delay Register 129
- The WRITE 130
- Registers 130
- Configuration 132
- Direct Channel 133
- Direct Control 133
- Programming Examples 134
- Reading the Device 135
- Type Register 135
- Appendix E 138
- 149
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