UART/RS232 Triggering and Serial Decode 25Keysight InfiniiVision 2000 X-Series Oscilloscopes User's Guide 341• When using the 9 bit format, all data words are displayed in green, includingthe 9th bit. The 9th bit is displayed on the left.• When a data word value is selected for framing, it is displayed in light blue.When using 9-bit data words, the 9th bit will also be displayed in light blue.• Decoded text is truncated at the end of the associated frame when there isinsufficient space within frame boundaries.• Pink vertical bars indicate you need to expand the horizontal scale (and runagain) to see decode.• When the horizontal scale setting does not permit the display of all availabledecoded data, red dots will appear in the decoded bus to mark the location ofhidden data. Expand the horizontal scale to allow the data to display.• An unknown (undefined) bus is shown in red.• A parity error will cause the associated data word to be shown in red, whichincludes the 5-8 data bits and the optional 9th bit.UART/RS232 TotalizerThe UART/RS232 totalizer consists of counters that provide a direct measure ofbus quality and efficiency. The totalizer appears on screen whenever UART/RS232Decode is ON in the Serial Decode Menu.The totalizer is running, counting frames and calculating the percentage of errorframes, even when the oscilloscope is stopped (not acquiring data).The ERR (error) counter is a count of Rx and Tx frames with parity errors. The TXFRAMES and RX FRAMES counts include both normal frames and frames withparity errors. When an overflow condition occurs, the counter displays OVERFLOW.The counters can be reset to zero by pressing the Reset UART Counters softkey inthe UART/RS232 Settings Menu.
