User Manual

7 Protocol Decoding RIGOL
DS4000 User’s Guide
7-7
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.