Measurement-computing Digital488/80A Manual do Utilizador Página 82
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? - Query
SYNTAX
?
(Command Support) Returns present configuration or mode of the command
preceding the
?.
Note:
One exception to this command description is the View Version (
V?) command
which is not related to the View Configuration (V) command.
DESCRIPTION
All Digital488/80A commands offer a Query (
?) option which may be used to determine the present configuration or
mode of a command previously executed. To use this option, the first letter of the command is used, followed by a
question mark (
?). One exception to this command description is the View Version (V?) command which is not related
to the View Configuration (V) command.
Any number of these Query commands may be combined into one string to allow the user to construct a specialized
status command requesting the Digital488/80A to return only that information which is of interest for a given
application. The Execute (
X) command is not needed when using the Query option of a command.
EXAMPLE 1: Channel 1 SRQ Status.
PRINT#1,"CLEAR08"
Line 1: Reset the Digital488/80A.
PRINT#1,"OUTPUT08;M4X"
Line 2: Select SRQ on IEEE 488 bus error.
PRINT#1,"OUTPUT08;M?"
Line 3: Determine the last Service Request Mask (M) command executed.
PRINT#1,"ENTER08"
Line 4: Read data from the Digital488/80A.
INPUT#2,A$,
PRINT A$
Line 6: Display shows: M4
EXAMPLE 2: Using the User Status (U) Command to Return Channel 1 Status.
PRINT#1,"CLEAR08"
Line 1: Reset the Digital488/80A.
PRINT#1,"OUTPUT08;U0X"
Line 2: Request the status of Channel 1.
PRINT#1,"ENTER08"
Line 3: Read data from the Digital488/80A.
INPUT#2,A$,
PRINT A$
Line 5: Display shows the status message:
*.*C#E#F#G#I###K#L####M###P#R#S##Y#
EXAMPLE 3: Using a Query (?) Command String to Return the Same Channel 1 Status.
PRINT#1,"CLEAR08"
Line 1: Reset the Digital488/80A.
PRINT#1,"OUTPUT08;V?C?E?
F?G?I?K?L?M?P?R?S?Y?X"
Line 2: Request the status of Channel 1.
PRINT#1,"ENTER08"
Line 3: Read data from the Digital488/80A.
INPUT#2,A$,
PRINT A$
Line 5: Display shows the same status message:
*.*C#E#F#G#I###K#L####M###P#R#S##Y#
76 Digital488/80A Commands
967695 Digital488/80A User's Manual
- User's Manual 1
- Introduction to this Manual 3
- Table of Contents 4
- 7 - Troubleshooting 5
- A - Appendix A 5
- B - Appendix B 5
- Digital488/80A Overview 1 7
- Accessories 8
- Specifications 9
- CAUTION 10
- Data Transfer Speeds 10
- Digital488/80A Setup 2 11
- Hardware Setup 12
- Default DIP Switch Settings 13
- Addressing Mode Selection 13
- Secondary Address Settings 14
- HVCX1 Option Setup 16
- WARNING 16
- Digital I/O Ports 23
- Introduction 25
- Line Voltage Selection 26
- Fuse Replacement 28
- Rack Mount 29
- Bench Top 29
- Power-Up Activation 30
- Programming Examples 31
- C0 is in use 33
- C) command C5 was executed 33
- Digital488/80A Operation 4 35
- Clear (Pin 41) 36
- Data Strobe (Pin 42) 36
- Trigger (Pin 36
- Inhibit (Pin 44) 37
- Service (Pin 45) 37
- External Data Ready (Pin 46) 37
- IEEE 488 Bus Support 38
- Bus Addresses 40
- Bus Terminators 40
- IEEE 488 Background 5 41
- Bus Lines & Bus Commands 42
- Handshake Lines 43
- Data Transfer Lines 43
- Bus Command Groups 44
- More On Service Requests 45
- Digital488/80A Commands 6 47
- Command Syntax 48
- Command Set & Support 49
- Command Summary 50
- - SRQ on Ready 51
- Command Reference 52
- A - Bit Set 53
- B - Bit Clear 54
- C - Configuration 55
- D - Data Output 56
- E? - Query Error Status 57
- F - Data Format 59
- G - Bus Input/Output 63
- H - Handshake 64
- I - Invert 65
- K - End-Or-Identify 66
- L - Buffer 67
- M - Service Request Mask 68
- O - Recall Configuration 69
- P - Port Select 70
- Q - Inhibit 71
- R - Data Ready 72
- S - Save Configuration 73
- T - Test 74
- U - User Status 75
- V - View Configuration 78
- V? - View Version 79
- X - Execute 80
- Y - Bus Terminator 81
- ? - Query 82
- Serial Poll Status Byte 83
- Troubleshooting 7 85
- Buffer Overrun 86
- Query Error Status 86
- Appendix A A 87
- Software Setup 88
- Appendix B B 91
- IEEE 488 Bus Commands 92
- ASCII Codes 93
- ASCII Code Details 95
- Abbreviations 104
- Notes 106
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