diff --git a/a8000_protocol b/a8000_protocol
index e1bab29..6d52b54 160000
--- a/a8000_protocol
+++ b/a8000_protocol
@@ -1 +1 @@
-Subproject commit e1bab29823705e2518e61de9e2dc3d8535a5eaa6
+Subproject commit 6d52b54e3c528a0be076d120d033ecfeb1051ee0
diff --git a/usrc/subboards/subboard90_optical_module/optical_module_v2.cpp b/usrc/subboards/subboard90_optical_module/optical_module_v2.cpp
index 96fad38..a0048fd 100644
--- a/usrc/subboards/subboard90_optical_module/optical_module_v2.cpp
+++ b/usrc/subboards/subboard90_optical_module/optical_module_v2.cpp
@@ -162,6 +162,7 @@ int32_t OpticalModuleV2::start_t_optical_scan(int32_t scanDirection, int32_t las
     ZLOGI(TAG, "--------------start_t_optical_scan-----------");
     int32_t intervalStep = 0;
     int32_t scanStartPos = 0;
+    osDelay(50);
 
     if (scanDirection >= 0) {
       intervalStep = -m_reg.scan_step_interval;
@@ -219,6 +220,7 @@ int32_t OpticalModuleV2::start_f_optical_scan(int32_t scanDirection, int32_t las
   m_thread.stop();
   m_thread.start([this, scanDirection, lasterGain, scanGain]() {
     ZLOGI(TAG, "--------------start_f_optical_scan-----------");
+    osDelay(50);
 
     int32_t intervalStep = 0;
     int32_t scanStartPos = 0;