GW Instek GDS-2000A series Quick start guide for Logic analyzer option - Manual (Page 16)

Bus Trigger Settings -UART
The digital channels can be set up to trigger on UART
specific conditions.
1. Configure the Bus key to UART.
 The UART option needs to be set in the Bus
menu first before the UART trigger settings
can be configured.
2. Press the trigger Menu key and select
Type > Others > Bus.
3. Press Trigger On to set triggering conditions.
 There are 8 UART triggering conditions: Tx,
Start Bit, Rx Start Bit, Tx End of Packet,, Rx
End of Packet, Tx Data, Rx Data, Tx Parity
Bit, Rx Parity Bit.
4. If Tx Data or Rx Data was selected, press Data to
configure what data to trigger on.