Rigol SD-DS2000 - Serial data decode option for DS2000 series oscilloscopes.

Serial data decode option

• Serial data decode option for DS2000 series oscilloscopes
• This Product Includes RS-232, I2C, and SPI decoding

Serial data decoding and trigger option for DS2000 series digital oscilloscopes, DS2000A series digital oscilloscopes and MSO2000A series mixed signal oscilloscopes. Includes RS-232, I2C, and SPI decoding.

RS232 decoding function menu

1. TX and RX Channel Setting

Press TX to select any channel (CH1 to CH4) as the transmitting channel and when “OFF” is selected, no transmitting channel is set. Use the same method the set the RX channel. What’s more, you need to set the thresholds of the input channels of TX and RX. Switch the menu page and press TXThreshold and RXThreshold respectively to input the desired threshold values.

2. Polarity Setting

Press Polarity to select “-” (negative polarity) or “+” (positive polarity) and the default is negative polarity. The oscilloscope will select the rising or falling edge as the start position during decoding.

3. Endian Setting

Press Endian to select “LSB” or “MSB” and the default is “LSB”.

4. Baud Rate Setting

Press Baud to select the desired baud rate and the default is 9600bps.

5. Data Packet Setting

As mentioned before, in RS232, you need to set the start bit, data bits, check bit (optional)  and  stop  bit of  each frame of data. “Start  Bit” is specified by the “Polarity Setting”. The setting methods of other parameters are as follows:

• Press Data Bits to set the data width of each frame. It can be set to 5, 6, 7, 8 or 9 and the default is 8.
• Press Stop Bit to set the stop bit after each frame of data. It can be set to 1 bit, 1.5 bits or 2 bits. 
• Press Even-OddCheck to set the even-odd check mode of the data transmission. It can be set to None, Odd Check or Even Check.  
• Press Packet to enable or disable the packet end. When packet end is enabled, several data blocks are combined according to the packet end.
• Press PacketEnd to set the packet end during data transmission and it can be set to 00 (NULL), 0A (LF), 0D (CR), 20 (SP) or FF.

6. Display-related Setting

• Press Format to set the display format of the bus to Hex, Decimal, Binary or ASCII.
• Press Offset and use to adjust the vertical display position of the bus.
• Press BusStatus to turn the bus display on or off.

7. Decoding Table

The decoding table displays the decoded data, the corresponding time and error information on TX and RX data lines in table format. It can be used to observe relatively longer decoded data to solve the problem that some data could not be seen clearly on the screen.

Press Event Table → Event Table to select “ON” (note that this operation is only available when  BusStatus is set to “ON”)  to enter the decoding table interface as shown in the figure below. The decoding table lists the decoded data in time order. If error occurs during the decoding, the corresponding error information is displayed. If an USB storage device is currently connected to the instrument, press Export to export the data table to the external USB storage device in CSV format.

8. The Error Expression during Decoding

DS4000 makes full use of the resources such as color and view to express the results of the protocol decoding effectively so as to let users find the desired information quickly.

SPI decoding function menu

1. SS Setting

• Press SS to turn the chip select line setting interface on.
• Press Channel to select any channel (CH1 to CH4) as the chip select channel. When “OFF” is selected, the sample of MISO and MOSI occurs at the jumping point of SCLK.
• Press Polarity to set the polarity of the chip select channel to “Low” or“High”.
• Press Threshold to set the threshold of the selected channel.

2. SCLK Setting

• Press SCLK to turn on the clock line setting interface.
• Press Channel to select any channel (CH1 to CH4) as the clock channel.
• Press Slope to set the instrument to sample MISO and MOSI on the rising edge or falling edge of SCLK.
• Press Threshold to set the threshold of the clock channel.

3. MISO Setting

• Press MISO to enter the MISO data line setting interface.
• Press Channel to select any channel (CH1 to CH4) as the MISO data channel. When “OFF” is selected, this data line is not set.
• Press Polarity to set the polarity of the MISO data line to “Low” or “High”.
• Press Threshold to set the threshold of the MISO data channel.

4. Data Bits Setting

• Press Data Bits to set the number of bits of each frame of data. The range available is from 4 to 32.

5. Endian Setting

• Press Endian to select “LSB” or “MSB” and the default is “MSB”.

6. Display-related Setting

• Press Format to set the display format of the bus to Hex, Decimal, Binary or ASCII.
• Press Offset and use to  adjust the vertical display position of the bus.
• Press BusStatus to turn the bus display on or off.

7. Decoding Table

The decoding table displays the decoded data, the corresponding time and error information on the MOSI or MISO data line in table format. It can be used to observe relatively longer decoded data to solve the problem that some data could not be seen clearly on the screen.

Press Event Table → Event Table to select “ON” (note that this operation is only available when BusStatus is set to “ON”) to enter the decoding table interface as shown in the figure below. If an USB storage device is currently connected to the instrument, press Export to export the data table to the

external USB storage device in CSV format.

9. Error Expressions during Decoding

When the clock for a frame in SPI is nout enough, the data is filled with red patches. For example, when Data Bits is set to 7 and SCLK slope is set to rising edge, decoding error will be generated.