diff --git a/scripts/sch3.gd b/scripts/sch3.gd
index 8cfb7520..d83d1436 100644
--- a/scripts/sch3.gd
+++ b/scripts/sch3.gd
@@ -97,6 +97,7 @@ class Sch3 extends unit.Unit:
             rx_tick = Time.get_ticks_msec()
             if cmd_state == CmdState.WAIT:
                 cmd_state = CmdState.DONE
+                emit_signal('command_done', self)
             emit_signal(code, base_addr, data)
             if not online:
                 online = true