Measurement-computing Digital488/80A Bedienungsanleitung Seite 59
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F - Data Format
SYNTAX
Fn Define format n of data, where n = value from 0 to 5.
F0
(Default) Define ASCII hexadecimal (4 bits per character).
F1
Define ASCII character (4 bits per character).
F2
Define ASCII binary (1 bit per character).
F3
Define ASCII decimal (8 bits per number).
F4
Define Binary (each byte = 8 bits).
F5
Define High-speed binary (each byte = 8 bits).
F? Returns current data format n.
DESCRIPTION
The Data Format (
F) command determines the method by which input and output data are described. The six
available data formats are discussed in the following text.
Data Format
F0 - ASCII Hexadecimal
In the default Data Format F0, the data are described in ASCII hexadecimal, with each character having a value from
0 through 9, or A through F. Each ASCII character describes 4 bits of data.
ASCII Hexadecimal Decimal Equivalent ASCII Hexadecimal Decimal Equivalent
0
0
8
8
1
1
9
9
2
2
A
10
3
3
B
11
4
4
C
12
5
5
D
13
6
6
E
14
7
7
F
15
Data received for output to the digital ports must be contained within a
D command prefix and a Z terminator suffix. If
the amount of data sent is less than the number of bits programmed as outputs, then the least-significant bits contain
the data sent and the most-significant bits are cleared to logic 0. If the data sent is greater than the number of bits
programmed for output or selected by the Port Select (
P) command, then the Digital488/80A generates a Conflict Error
(E3) and ignores the entire command string up to the next Execute (X) command. The Data Strobe output is pulsed
for approximately 50 microseconds after new data is output on the selected port(s).
When the Digital488/80A is addressed to Talk in Data Ready (
R) mode R0, it asserts Inhibit, reads the data from all 5
ports, unasserts Inhibit, and outputs the number of characters determined by the Bus Input/Output (G) and Port Select
(P) commands. Leading zeros are not suppressed, and the bus terminators are appended to the output. After output,
the Digital488/80A must be readdressed to Talk to perform subsequent reads. In Data Ready (
R) mode R1 or R2,
EDR may also be used to capture data in this data format.
Data Format
F1 - ASCII Character
In Data Format F1, the data are coded and transmitted in ASCII characters with the 4 least-significant bits of each
ASCII character representing 4 bits of data.
ASCII Character Decimal Equivalent ASCII Character Decimal Equivalent
0
0
8
8
1
1
9
9
2
2
: (colon)
10
3
3
; (semi-colon)
11
4
4
< (less than)
12
5
5
= (equals)
13
6
6
> (greater than)
14
7
7
? (question mark)
15
Digital488/80A User’s Manual
967695 Digital488/80A Commands 53
- 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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