  The primary accelerator of DCLS (Dalian Coherent Light Source) operates at a
repetition rate of 20 Hz now, and the beam is divided at the end of the linear
accelera-tor through Kicker to make two 10 Hz beamlines work simultaneously.
For the simultaneous emission FEL of two beamlines, the beam energy of the two
beamlines is required to be controlled independently, so we need to set the
amplitude and phase of each beamline. This paper implements a microwave
amplitude and phase setting function based on event timing. We upgraded the
EVG/EVR event timing system and LLRF (Low-Level Radiofrequency) system. Two
special event codes and a repetition rate division of 10 Hz are added to the
event timing system, and we can set the microwave amplitude and phase by
judging the event code in LLRF. We ulti-mately perform the microwave triggering
at a repetition rate of 10 Hz for each beamline and validate this function
through beam experiments.
