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7 Protocol Decoding RIGOL
DS2000 User’s Guide
7-5
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
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
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, baud rate is used to represent the transmitting rate (namely bits per
second) of the data. The commonly used baud rates include 2400 bps, 4800 bps,
9600 bps, 19200 bps, 38400 bps, 57600 bps and 115200 bps.
In RS232, you need to set the start bit, data bits, check bit (optional) and stop bit of
each frame of data.
- User’s Guide 1
- Guaranty and Declaration 3
- Safety Requirement 4
- Safety Terms and Symbols 6
- Measurement Category 7
- Ventilation Requirement 8
- Working Environment 9
- DS2000 User’s Guide 10
- General Care and Cleaning 11
- Environmental Considerations 12
- DS2000 Series Overview 13
- Document Overview 15
- Contents 17
- 1 Quick Start 23
- General Inspection 24
- Appearance and Dimensions 25
- RIGOL 1 Quick Start 26
- To Connect to Power Supply 27
- Power-on Inspection 28
- To Connect the Probe 29
- Function Inspection 30
- 1 Quick Start RIGOL 31
- Probe Compensation 32
- Overview 33
- Rear Panel Overview 34
- VERTICAL 36
- HORIZONTAL 37
- TRIGGER 38
- RUN/STOP 38
- Navigation Knob 40
- User Interface 43
- To Use the Security Lock 47
- 2 To Set the Vertical System 49
- To Enable the Channel 50
- Channel Coupling 51
- Bandwidth Limit 51
- Probe Ratio 52
- Waveform Invert 53
- Vertical Scale 53
- Vertical Expansion 54
- Amplitude Unit 54
- Channel Label 55
- Delay Calibration 56
- Delayed Sweep 58
- Time Base Mode 60
- X-Y Mode 61
- Roll Mode 64
- Horizontal Scale 65
- Horizontal Reference 66
- 4 To Set the Sample System 67
- Acquisition Mode 68
- Peak Detect 70
- High Resolution 70
- Sample Mode 71
- Sample Rate 72
- Memory Depth 74
- Antialiasing 76
- Trigger Source 78
- Trigger Mode 79
- Trigger Coupling 81
- Trigger Holdoff 82
- Noise Rejection 83
- Trigger Type 84
- Edge Trigger 85
- Pulse Trigger 87
- Runt Trigger 89
- Windows Trigger (Option) 92
- Nth Edge Trigger (Option) 94
- Slope Trigger 96
- Video Trigger (HDTV Option) 99
- Pattern Trigger 101
- Source A 103
- Source B 103
- Time Out 105
- Time Out< T 105
- Duration Trigger (Option) 107
- Setup/Hold Trigger 109
- RS232 Trigger 111
- I2C Trigger 113
- SPI Trigger 116
- USB Trigger (Option) 118
- Trigger Output Connector 120
- 6 To Make Measurements 121
- Math Operation 122
- Substraction 123
- Multiplication 123
- Division 124
- Logic Operation 128
- Advanced Operation 130
- Auto Measurement 133
- Time Parameters 136
- Voltage Parameters 138
- Other Parameters 140
- Measurement Setting 142
- To Clear the Measurement 144
- All Measurement 145
- Statistic Function 146
- Measurement History 147
- Cursor Measurement 148
- Manual Mode 149
- Track Mode 152
- Auto Mode 155
- 7 Protocol Decoding 157
- Parallel Decoding 158
- Threshold 159
- RIGOL 7 Protocol Decoding 160
- RS232 Decoding (Option) 161
- Start Bit 162
- Data Bit 162
- Check Bit 162
- Stop Bit 162
- 7 Protocol Decoding RIGOL 163
- I2C Decoding (Option) 166
- SPI Decoding (Option) 169
- 8 Reference Waveform 173
- To Enable REF Function 174
- To Set the Color 175
- To Select REF Source 175
- To Save to Internal Memory 175
- RIGOL 8 Reference Waveform 176
- 9 Pass/Fail Test 177
- To Enable Pass/Fail Test 178
- To Select Source 178
- Mask Range 178
- Test and Ouput 179
- To Save the Test Mask 180
- To Load the Test Mask 181
- 10 Waveform Record 183
- Waveform Record 184
- 10 Waveform Record RIGOL 185
- Record Constant On 186
- Waveform Playback 188
- Waveform Analysis 190
- RIGOL 10 Waveform Record 192
- Analysis Based on Trace 194
- Outline of the Current Mask 195
- 11 Display Control 197
- To Select the Display Type 198
- To Set the Persistence Time 199
- RIGOL 11 Display Control 200
- To Set the Screen Grid 201
- To Set the Grid Brightness 201
- To Set the Menu Display 201
- 12 Store and Recall 203
- Storage System 204
- Storage Type 205
- RIGOL 12 Store and Recall 206
- Internal Storage and Recall 207
- External Storage and Recall 209
- 12 Store and Recall RIGOL 211
- Disk Management 212
- To Select File Type 213
- English Input Method 215
- Chinese Input Method 216
- To Delete a File or Folder 217
- To Rename a File or Folder 218
- To Clear the Local Memory 218
- Factory 219
- 13 System Function Setting 225
- LAN Setting 226
- IP Configuration Type (DHCP) 227
- Set the Gate 228
- USB Device 230
- To Set the GPIB Address 230
- System-related 231
- System Information 232
- Power-off Recall 232
- System Time 233
- Self-calibration 235
- Aux Output 236
- Option Management 237
- 14 Remote Control 239
- Remote Control via USB 240
- 14 Remote Control RIGOL 241
- RIGOL 14 Remote Control 242
- Remote Control via LAN 244
- Remote Control via GPIB 247
- 15 Troubleshooting 249
- RIGOL 15 Troubleshooting 250
- 16 Specifications 251
- Horizontal 252
- Vertical 252
- Trigger 253
- RIGOL 16 Specifications 254
- Measure 255
- 16 Specifications RIGOL 257
- 17 Appendix 259
- Appendix B: Warranty 260
- 17 Appendix RIGOL 261
- Index RIGOL 263
- RIGOL Index 264
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