diff --git a/src/ramses_tx/parsers.py b/src/ramses_tx/parsers.py
index 780fb873..73a0250d 100644
--- a/src/ramses_tx/parsers.py
+++ b/src/ramses_tx/parsers.py
@@ -1507,10 +1507,12 @@ def parser_22e5(payload: str, msg: Message) -> Mapping[str, float | None]:
 
 
 # WIP: unknown, HVAC
-def parser_22e9(payload: str, msg: Message) -> Mapping[str, float | None]:
-    # RP --- 32:153258 18:005904 --:------ 22E9 004 00C8C814
-    # RP --- 32:155617 18:005904 --:------ 22E9 004 008CC814
-
+def parser_22e9(payload: str, msg: Message) -> Mapping[str, float | str | None]:
+    if payload[2:4] == "01":
+        return {
+            "unknown_4": payload[4:6],
+            "unknown_6": payload[6:8],
+        }
     return parser_22e0(payload, msg)
 
 
diff --git a/tests/tests/parsers/code_22e9.log b/tests/tests/parsers/code_22e9.log
new file mode 100644
index 00000000..597ca340
--- /dev/null
+++ b/tests/tests/parsers/code_22e9.log
@@ -0,0 +1,8 @@
+# unknown devices nearby
+2024-01-01T00:00:00.000000 000 RP --- 32:153258 18:005904 --:------ 22E9 004 00C8C814  # {'percent_2': 1.0, 'percent_4': 1.0, 'percent_6': 0.1}
+2024-01-01T00:00:00.000000 000 RP --- 32:155617 18:005904 --:------ 22E9 004 008CC814  # {'percent_2': 0.7, 'percent_4': 1.0, 'percent_6': 0.1}
+
+# Vasco D60 - only sent as an RP
+2024-10-15T12:32:31.521795 000 RQ --- 18:130140 32:022222 --:------ 22E9 001 00        # {}
+2024-10-15T12:32:31.538027 082 RP --- 32:022222 18:130140 --:------ 22E9 004 00010000  # {'unknown_4': '00', 'unknown_6': '00'}  # seen 75% of the time
+2024-10-15T22:59:02.967986 084 RP --- 32:022222 18:130140 --:------ 22E9 004 00010701  # {'unknown_4': '07', 'unknown_6': '01'}  # seen 25% of the time