diff --git a/src/pygui/serialcomm/data_parser.py b/src/pygui/serialcomm/data_parser.py
index dea1337..b91ee82 100644
--- a/src/pygui/serialcomm/data_parser.py
+++ b/src/pygui/serialcomm/data_parser.py
@@ -150,19 +150,19 @@ def parse_binary_data(data_bytes: bytes, family_code: str) -> Optional[list[list
         if family_code == "X":
             return _parse_x_binary(data_bytes)
         else:
-            return _parse_p_binary(data_bytes)
+            return _parse_p_binary(data_bytes, family_code)
     except Exception as exc:
         log.error("Binary parse failed: %s", exc)
         return None
 
 
-def _parse_p_binary(data_bytes: bytes) -> list[list[str]]:
+def _parse_p_binary(data_bytes: bytes, family_code: str = "P") -> list[list[str]]:
     """Parse P-family (and A/B/C/D/E/F) binary data.
 
     Each block of 256 readings has 244 valid + 12 overhead.
     Valid readings are chunked into rows of the family's sensor count (244).
     """
-    sensor_count = sensor_count_for("P")
+    sensor_count = sensor_count_for(family_code or "P")
     readings: list[str] = []
 
     # Read 2 bytes at a time (UInt16 little-endian)
@@ -180,7 +180,7 @@ def _parse_p_binary(data_bytes: bytes) -> list[list[str]]:
         result.append(readings[idx : idx + sensor_count])
         idx += sensor_count
 
-    log.info("Parsed P-family: %d rows × %d cols", len(result), sensor_count)
+    log.info("Parsed %s-family: %d rows × %d cols", family_code or "P", len(result), sensor_count)
     return result