Measurement-computing Digital488/80A Manual do Utilizador Página 40
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• Selected Device Clear (SDC): In the F0 through F4 formats, Device Clear resets the Digital488/80A to
its power on default state, and pulses the Clear output line for approximately 50 microseconds.
If either channel is in the high-speed binary data format (F5), a DCL or SDC to either channel enables
the command interpreter on the channel in the
F5 mode, and then changes the format to F0. All other
parameters remain unchanged. In addition, the Clear output line is not pulsed by
DCL or SDC when
either channel is in the
F5 mode. This is the only programmable method to exit the F5 format.
• Serial Poll Disable (
SPD): Disables the Digital488/80A from responding to Serial Polls by the
controller.
• Serial Poll Enable (
SPE): When Serial Poll Enabled, the Digital488/80A sets itself to respond to a
Serial Poll with its Serial Poll Status byte if addressed to Talk. When the Serial Poll byte is accepted
by the controller, any pending
SRQs are cleared. The Digital488/80A will continue to try to output its
Serial Poll response until it is Serial Poll Disabled by the controller.
• Unlisten (
UNL): UNL places the Digital488/80A in the Listener Idle State.
• Untalk (
UNT): UNT places the Digital488/80A in the Talker Idle State.
Bus Addresses
The IEEE 488 interface standard permits up to 15 devices to be configured within one system. Each of
these devices must have a unique address to avoid confusion. In a similar fashion, every building in town
has a unique address to prevent one home from receiving another home's mail. Exactly how each device's
address is set is specific to the product's manufacturer. Some are set by DIP switches in hardware, others
by software. To determine how to set the Digital488/80A addresses, refer to Chapter 2: Digital488/80A
Setup.
IEEE 488 bus addresses are sent with bus (multiline) commands from the Active Controller. These
commands include My Listen Address (
MLA), My Talk Address (MTA), Talk Address Group (TAG), and
Listen Address Group (
LAG).
Bus Terminators
The factory default setting for the Digital488/80A output terminating character is Carriage Return, Line
Feed (
CR LF). If necessary, it can be changed using the Terminator (Y) command. To save the new
setting as the power-up default, it must be saved with the Save Configuration (
S) command. Then this new
setting can be loaded with the Recall Configuration (
O) command. For more information on these
commands, refer to Chapter 6: Digital488/80A Commands.
The only input terminating character accepted by the Digital488/80A is the Execute (
X) command. All
other input terminators are ignored.
34 Digital488/80A Operation 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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