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Chapter 8 Protocol Decoding RIGOL
MSO2000A/DS2000A User’s Guide 8-5
RS232 Decoding (Option)
RS232 serial bus consists of the transmitting data line (TX) and the receiving data
line (RX).
DeviceA
DeviceB
Tx
Rx
Rx Tx
Figure 8-3 RS232 Serial Bus Schematic Diagram
The industry standard of RS232 uses “Negative Logic”, namely high level is logic “0”
and low level is logic “1”.
1
0 0 0 0
1 1 1 1 1
Figure 8-4 RS232 Industrial Standard Schematic Diagram
By default, RS232 uses LSB (Least Significant Bit) transmission sequence, namely
the lowest bit of the data is transmitted first. While for MSB (Most Significant Bit),
the highest bit of the data is transmitted first.
Bit0
Bit5
Bit2
Bit3
Bit6
Bit1
Bit7
Bit4
t
Bit7
Bit2
Bit5
Bit4
Bit1
Bit6
Bit0
Bit3
t
Endian (LSB) Endian (MSB)
In RS232, you need to set the start bit, data bits, check bit (optional) and stop bit of
each frame of data.
Start Bit
Data Bit
Check Bit
Stop Bit
- User’s Guide 1
- MSO2000A/DS2000A Series 1
- Guaranty and Declaration 3
- Safety Requirement 4
- Safety Terms and Symbols 6
- Measurement Category 10
- Ventilation Requirement 11
- Working Environment 12
- RIGOL 13
- General Care and Cleaning 14
- Environmental Considerations 15
- Document Overview 18
- Contents 21
- RIGOL Contents 22
- Contents RIGOL 23
- Chapter 1 Quick Start 29
- General Inspection 30
- Appearance and Dimensions 31
- To Connect to Power Supply 32
- Power-on Inspection 33
- To Connect the Probe 33
- RPL2316 Logic Probe 34
- Function Inspection 35
- Probe Compensation 36
- Overview 37
- Rear Panel Overview 39
- RIGOL Chapter 1 Quick Start 40
- VERTICAL 41
- HORIZONTAL 42
- TRIGGER 43
- RUN/STOP 44
- Navigation Knob 45
- Signal Source 47
- Logic Analyzer 48
- User Interface 49
- To Use the Security Lock 54
- To Enable the Analog Channel 58
- Channel Coupling 59
- Bandwidth Limit 59
- Probe Ratio 60
- Input Impedance 61
- Waveform Invert 61
- Vertical Scale 62
- Vertical Expansion 63
- Amplitude Unit 63
- Channel Label 63
- . Zero offset is defined as 64
- Delayed Sweep 68
- Time Base Mode 70
- Delay and Phase” 72
- Roll Mode 73
- Horizontal Scale 74
- Horizontal Reference 75
- Acquisition Mode 78
- Peak Detect 80
- High Resolution 80
- Sample Mode 81
- Sample Rate 82
- LA Sample Rate 83
- Trigger Point 84
- Pre-sample 84
- Delayed Sample 84
- Memory Depth 84
- LA Memory Depth 85
- Antialiasing 85
- Trigger Source 88
- Trigger Mode 89
- Trigger Coupling 91
- Trigger Holdoff 92
- Noise Rejection 93
- Trigger Type 94
- Edge Trigger 95
- Pulse Trigger 97
- Runt Trigger 99
- Windows Trigger (Option) 102
- Nth Edge Trigger (Option) 104
- Slope Trigger 106
- UpLevel - LowLevel 108
- SlewRate = 108
- Video Trigger (HDTV Option) 109
- Pattern Trigger 112
- Delay Trigger (Option) 114
- Time Out 117
- Time Out< T 117
- Duration Trigger (Option) 119
- Setup/Hold Trigger 121
- RS232 Trigger 123
- I2C Trigger 125
- SPI Trigger 128
- USB Trigger (Option) 130
- CAN Trigger (Option) 132
- Trigger Output Connector 135
- Math Operation 138
- Multiplication 139
- Division 139
- Logic Operation 143
- Advanced Operation 145
- MATH Label 147
- Auto Measurement 148
- Time Parameters 150
- Delay and Phase 151
- Voltage Parameters 153
- Other Parameters 154
- Measurement Setting 156
- To Clear the Measurement 158
- All Measurement 159
- Statistic Function 160
- Measurement History 160
- Cursor Measurement 161
- Track Mode 166
- Auto Mode 169
- X-Y Mode 170
- Chapter 7 Digital Channel 171
- To Move the Digital Channel 172
- Group Set 174
- Reorder Setting 175
- To Set the Threshold 175
- To Use the Digital Bus 176
- To Set the Label 177
- Zero offset is defined as 178
- Chapter 8 Protocol Decoding 179
- Parallel Decoding 180
- RS232 Decoding (Option) 183
- (00000100，LSB) 187
- The check bit detected is 1 187
- I2C Decoding (Option) 188
- Address Information 191
- SPI Decoding (Option) 192
- Not enough 194
- CAN Decoding (Option) 195
- Chapter 9 Reference Waveform 199
- To Enable REF Function 200
- To Set the Color 200
- To Select REF Source 200
- To Save REF Waveform 201
- Chapter 10 Pass/Fail Test 203
- To Enable Pass/Fail Test 204
- To Select Source 204
- Mask Range 204
- To Save the Test Mask 206
- To Load the Test Mask 206
- Chapter 11 Waveform Record 207
- Waveform Record 208
- Record Constant On 210
- Waveform Playback 212
- Waveform Analysis 214
- Analysis Based on Trace 218
- Outline of the Current Mask 219
- Chapter 12 Display Control 221
- To Select the Display Type 222
- To Set the Screen Grid 224
- To Set the Grid Brightness 224
- To Set the Menu Display 224
- Chapter 13 Signal Source 225
- Parameter Setting Method 226
- To Output Basic Waveform 227
- To Output Square 228
- To Output Ramp 229
- To Output Pulse 230
- To Output DC 230
- To Output Noise 231
- To Output Built-in Waveform 232
- To Output Arbitrary Waveform 236
- To Select Waveform 238
- To Create Waveform 238
- To Edit Waveform 240
- Modulation 243
- Modulating Waveform 245
- Carrier Waveform 245
- Modulated Waveform 245
- Chapter 14 Store and Recall 247
- Storage System 248
- Storage Type 249
- Internal Storage and Recall 251
- External Storage and Recall 253
- Disk Management 255
- English Input Method 257
- Chinese Input Method 258
- To Delete a File or Folder 259
- To Rename a File or Folder 260
- To Clear the Local Memory 260
- Factory 261
- LAN Setting 270
- IP Configuration Type 271
- Auto IP 271
- Static IP 271
- Set the Gate 272
- USB Device 274
- GPIB Address 274
- System-related 275
- System Information 276
- Power-off Recall 276
- System Time 277
- Self-calibration 279
- Print Setting 280
- 15-13 281
- Power Status 283
- Aux Output 284
- Option Management 285
- Chapter 16 Remote Control 287
- Remote Control via USB 288
- Remote Control via LAN 292
- Remote Control via GPIB 295
- Chapter 17 Troubleshooting 297
- Chapter 18 Specifications 299
- Horizontal 300
- Vertical 300
- Vertical (Digital Channel) 302
- Trigger 302
- Measure 305
- General Specifications 309
- Chapter 19 Appendix 311
- Appendix B: Warranty 313
- Index RIGOL 315
- RIGOL Index 316
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