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E? - Query Error Status
SYNTAX
E?
Returns error status code which indicates the last error encountered. It returns:
•
E0 if No Error has occurred.
•
E1 if Unrecognized Command.
•
E2 if Invalid Command Parameter.
•
E3 if Command Conflict Error.
•
E5 if Non-Volatile RAM Checksum Failure.
•
E6 if Internal Data Buffer Overrun.
Note:
Except for
E5, error is cleared upon reading error status.
DESCRIPTION
The Query Error Status (
E?) command is used to determine the present error condition on the selected channel of the
Digital488/80A. After execution of the E? command, the present error condition is cleared. The error condition is also
cleared by executing the User Status (
U) command U0. When an error has occurred, the front-panel ERROR LED
indicator turns on. The ERROR LED stays on until an
E? or U0 command is executed.
If a Non-Volatile RAM Checksum Failure (
E5) occurs, then it can only be cleared by doing a save of the configuration
using the Save Configuration (
S) command. Executing this command updates the checksum to a known value and
clears the E5 error condition.
EXAMPLE 1: No Error.
PRINT#1,"CLEAR08"
Line 1: Reset the Digital488/80A.
PRINT#1,"OUTPUT08;E?"
Line 2: Query the error status.
PRINT#1,"ENTER08",
INPUT#2,A$,
PRINT A$
Line 5: Display shows: E0 (no errors have occurred).
EXAMPLE 2: Unrecognized Command.
PRINT#1,"OUTPUT08;W5X"
Line 1: Send an illegal command to the Digital488/80A (no W command exists).
PRINT#1,"OUTPUT08;E?"
Line 2: Query the error status (ERROR LED should be on).
PRINT#1,"ENTER08",
INPUT#2,A$,
PRINT A$
Line 5: Display shows: E1-Unrecognized Command (ERROR LED
should be off)
EXAMPLE 3: Error is cleared.
PRINT#1,"OUTPUT08;E?"
Line 1: Query the error status.
PRINT#1,"ENTER08",
INPUT#2,A$
PRINT A$
Line 4: Display shows E0 because the previous error condition was cleared
after reading the error status.
EXAMPLE 4: Invalid Command Parameter.
PRINT#1,"OUTPUT08;P8X"
Line 1: Send command with an invalid option (no P8 command option exists).
PRINT#1,"OUTPUT08;E?"
Line 2: Query the error status (ERROR LED should be on).
PRINT#1,"ENTER08",
INPUT#2,A$,
PRINT A$
Line 5: Display shows: E2-Invalid Parameter (ERROR LED should be
off).
EXAMPLE 5: Command Conflict Error. (See Next Page.)
Digital488/80A User’s Manual
967695 Digital488/80A Commands 51
- 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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