Agilent Technologies L4400 Guia do Utilizador Página 219
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L4450A 64-Bit Digital I/O with Memory and Counter 8
L4400 User’s Guide 207
Synchronous Buffered Inputs You can use synchronous mode handshake
with buffered (memory) input operations. (Buffered operations are
described in more detail beginning on page 210.) For buffered input
operations, the H0 line acts as a start/stop line. This line will be set high
wh
en the memory input command is executed and will return low when
the memory input operation has completed. The H1 line is not used and is
set to high impedance.
An external strobe input on the H2 line controls the pace of memory
trans
fers. The sending device must ensure the data is valid before the
T
SETUP
and stays valid until after T
HOLD
. T
SETUP
is 30 ns and T
HOLD
is
55 ns.
A synchronous buffered input using an external clock is shown in the
diag
ram below (default handshake line polarity).
H0 (Start/
Stop)
H2 (Strobe In)
Data In
Valid Don't-Care
T
SETUP
T
HOLD
T
CYCLE
>
100 ns
T
SETUP
T
HOLD
Valid
(Last Cycle)
Don't-Care Don't-Care Don't-CareValid
> 50 ns
For example, the following SCPI commands set the L4450A to have an
8- bit input using synchronous handshake with an external strobe input.
The number of bytes to read into memory is set to infinite (continuous
reading into memory until the memory is stopped). The memory is
enabled and then triggered. The start/stop line is set high following the
first byte handshake and remains high until the last byte is captured.
CONF:DIG:WIDT BYTE, (@1101)
CONF:DIG:DIR INP, (@1101)
CONF:DIG:HAND SYNC, (@1101)
SENS:DIG:MEM:SAMP:COUN 0, (@1101)
SENS:DIG:MEM:ENAB ON, (@1101)
SENS:DIG:MEM:STAR (@1101)
- Agilent L4400 Series 1
- LXI Class C Instruments 1
- Additional Safety Notices 4
- Declaration of Conformity 5
- Contents 7
- L4400 User’s Guide vii 9
- L4400 User’s Guide ix 11
- LXI Instruments 13
- Instrument Considerations 14
- L4400 User’s Guide 3 15
- 4 L4400 User’s Guide 16
- Bench-Top Operation 17
- Rack Mounting 17
- Procedure 18
- Install the Shelf Rails 19
- Install the Sliding Shelf 21
- Applying Power 23
- 12 L4400 User’s Guide 24
- Power Button 24
- 14 L4400 User’s Guide 26
- L4400 User’s Guide 15 27
- 16 L4400 User’s Guide 28
- Selecting a LAN Network 29
- Connecting the LAN Cables 30
- Private Network Connections 31
- IP Addresses and Host Names 32
- Configuring the LAN Interface 33
- Locating the Instruments 34
- Explorer pane 35
- Properties pane 35
- L4400 User’s Guide 23 35
- 24 L4400 User’s Guide 36
- L4400 User’s Guide 25 37
- Interactive IO 38
- Identifying the Instruments 39
- L4400 User’s Guide 29 41
- 30 L4400 User’s Guide 42
- L4400 User’s Guide 31 43
- 32 L4400 User’s Guide 44
- GPIB Configuration 45
- 34 L4400 User’s Guide 46
- The GPIB Address String 47
- 36 L4400 User’s Guide 48
- Highlight instrument and 49
- Adding Additional Instruments 50
- Firmware Updates 51
- ” in a green 52
- L4400 User’s Guide 41 53
- 42 L4400 User’s Guide 54
- L4400 User’s Guide 43 55
- 44 L4400 User’s Guide 56
- L4400 User’s Guide 45 57
- 46 L4400 User’s Guide 58
- Operating and Programming 59
- The LAN Reset Button 60
- The Front Panel LEDs 60
- Analog Bus Port 62
- Ext Trig/Alarms/DIO Port 63
- GPIB Connector 63
- LAN Port 63
- Syntax Conventions 65
- Command Separators 66
- Querying Parameter Settings 66
- L4400 SCPI Command Summary 67
- Operating and Programming 3 71
- L4400 User’s Guide 59 71
- Visual Basic.NET 72
- Modifying IVI-C Examples 73
- Visual Basic 6.0 75
- VISA COM Examples 75
- Analog Bus Applications 77
- Transients 78
- Safety Interlock 79
- User-Defined Channel Labels 80
- Scanning Applications 81
- Creating the Scan List 83
- Scan Trigger Source 84
- Manual Scanning 85
- Scanning on Alarm 86
- Trigger Count 87
- Sweep Count 88
- Channel Delay 89
- Reading Format 91
- Non-Sequential Scanning 91
- Monitor Mode 92
- L4400 User’s Guide 83 95
- Alarm Limits 96
- L4400 User’s Guide 85 97
- Viewing Stored Alarm Data 99
- Using the Alarm Output Lines 100
- Using Sequences 101
- Defining a Sequence 102
- 3 Operating and Programming 104
- Executing a Sequence 105
- Deleting Sequences 107
- Instrument State Storage 108
- Error Conditions 109
- Relay Cycle Count 110
- Calibration Overview 110
- L4421A 40-Channel Armature 111
- Multiplexer 111
- L4421A Measurement Functions 112
- L4421A SCPI Command Summary 113
- Opening and Closing Channels 115
- 104 L4400 User’s Guide 116
- L4400 User’s Guide 105 117
- L4421A Simplified Schematic 118
- L4421A D-Sub Connectors 119
- 34921T Terminal Block 120
- L4400 User’s Guide 109 121
- THIS PAGE INTENTIONALLY BLANK 122
- Agilent Technologies 123
- Matrix Switch Instrument 124
- L4433A SCPI Command Summary 125
- 116 L4400 User’s Guide 128
- L4400 User’s Guide 117 129
- Two-Wire Mode 130
- One-Wire Mode 131
- 120 L4400 User’s Guide 132
- Matrix 1 133
- Matrix 2 133
- 122 L4400 User’s Guide 134
- Matrix 3 136
- Matrix 4 136
- Matrices 1 and 2 137
- Matrices 3 and 4 137
- 126 L4400 User’s Guide 138
- L4437A General Purpose Switch 139
- 128 L4400 User’s Guide 140
- L4437A SCPI Command Summary 142
- L4437A Simplified Schematic 144
- L4437A D-Sub Connectors 145
- 34937T Terminal Block 146
- L4445A SCPI Command Summary 148
- (Sequence 149
- Operation) 149
- L4400 User’s Guide 137 149
- 138 L4400 User’s Guide 150
- Power Supplies 154
- Channel Numbering 155
- Simple Switch Control 156
- Remote Module Identifiers 157
- Drive Modes 157
- Continuous Drive Current 158
- Using Continuous Drive 158
- Pairing Channels 159
- Using Pulse Drive 160
- Long Execution Times 161
- Verifying Switch State 161
- LED Drive 163
- Default and Reset States 164
- ROUTe:RMODule:BANK:PRESet 165
- Distribution Boards 166
- Y1150A Connections 168
- Y1150A Switch Control 169
- Y1151A Connections 172
- Y1151A Switch Control 174
- Y1152A Connections 177
- Y1152A Switch Control 179
- 84904/5/6/7/8 181
- Y1153A Connections 182
- Y1153A Attenuator Control 184
- Y1154A Connections 187
- Y1154A Switch Control 189
- Y1155A Connections 193
- Y1155A Switch Control 194
- 184 L4400 User’s Guide 196
- Logic Gate 197
- 186 L4400 User’s Guide 198
- Mounting the Remote Modules 199
- SCPI Programming Examples 200
- L4450A SCPI Command Summary 204
- L4400 User’s Guide 199 211
- Basic Digital I/O Operations 212
- Writing Digital Data 213
- Handshaking 215
- Synchronous Handshake Mode 217
- H0 (Direction) 218
- H1 (Strobe) 218
- Data Ou t 218
- H0 (Start/ 219
- H2 (Strobe In) 219
- H0 (Start/Stop) 220
- H1 (Strobe Out) 220
- Data Out 220
- H2 (Cloc k In ) 221
- Buffered I/O Operations 222
- Deleting Traces 224
- Buffered (Memory) Input 224
- Interrupt Lines 225
- Memory Input Operations 226
- Byte Ordering 227
- Pattern Matching 228
- Ext Gate 229
- Initiated Measurement Mode 230
- L4450A D-Sub Connectors 231
- 34950T Terminal Block 234
- Level Output Mode 236
- Waveform (Trace) Mode 236
- L4400 User’s Guide 225 237
- L4451A SCPI Command Summary 238
- Subsystem 238
- Commands 238
- Level Mode 240
- Waveform Mode 241
- External Clock 242
- External Trigger 242
- Configuring a DAC Module 242
- L4400 User’s Guide 231 243
- 232 L4400 User’s Guide 244
- L4451A D-Sub Connector Pinout 245
- 34951T Terminal Block 246
- DIO, D/A, and Totalizer 247
- L4452A Multifunction Module 248
- L4452A SCPI Command Summary 249
- Digital Input/Output 253
- Totali zer 253
- DAC Output 254
- L4400 User’s Guide 243 255
- L4452A D-Sub Connector 256
- 34952T Terminal Block 257
- Appendix A 259
- Procedures 259
- Calibration Procedures 260
- Recommended Test Equipment 261
- Calibration Security 262
- Calibration Message 263
- Calibration Count 263
- Calibration Process 264
- L4400 User’s Guide 253 265
- L4451A Verification 266
- Current Output Verification 267
- Output Current 268
- Output Voltage 269
- Error From Nominal 269
- Voltage Adjustments 270
- Current Adjustments 271
- voltage 275
- Numerics 277
- 266 L4400 User’s Guide 278
- L4400 User’s Guide 267 279
- 268 L4400 User’s Guide 280
- L4400 User’s Guide 269 281
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