diff --git a/hgdriver/hgdev/common_setting.h b/hgdriver/hgdev/common_setting.h
index da45c75..1ca1114 100644
--- a/hgdriver/hgdev/common_setting.h
+++ b/hgdriver/hgdev/common_setting.h
@@ -292,6 +292,7 @@ enum
 	SLEEP_TIME_0MIN = 0,
 	SLEEP_TIME_5MIN,
 	SLEEP_TIME_10MIN,
+	SLEEP_TIME_20MIN,
 	SLEEP_TIME_30MIN,
 	SLEEP_TIME_60MIN,
 	SLEEP_TIME_120MIN,
diff --git a/hgdriver/hgdev/hg_scanner.cpp b/hgdriver/hgdev/hg_scanner.cpp
index 9f3fccc..2dd5fe2 100644
--- a/hgdriver/hgdev/hg_scanner.cpp
+++ b/hgdriver/hgdev/hg_scanner.cpp
@@ -4009,6 +4009,9 @@ int hg_scanner::device_io_control(unsigned long code, void* data, unsigned* len)
 		case SLEEP_TIME_10MIN:
 			val = 10;
 			break;
+		case SLEEP_TIME_20MIN:
+			val = 20;
+			break;
 		case SLEEP_TIME_30MIN:
 			val = 30;
 			break;