diff --git a/src/main/java/com/romraider/io/j2534/api/J2534ConnectionISO9141.java b/src/main/java/com/romraider/io/j2534/api/J2534ConnectionISO9141.java
index 0d20d287..5cf24364 100644
--- a/src/main/java/com/romraider/io/j2534/api/J2534ConnectionISO9141.java
+++ b/src/main/java/com/romraider/io/j2534/api/J2534ConnectionISO9141.java
@@ -157,6 +157,9 @@ public final class J2534ConnectionISO9141 implements ConnectionManager {
                 Config.PARITY.getValue(),
                 connectionProperties.getParity());
         api.setConfig(channelId, p1Max, p3Min, p4Min, loopback, dataBits, parity);
+        LOGGER.debug("J2534/ISO9141 set connection properties: bits=" +
+                connectionProperties.getDataBits() + ", parity=" +
+                connectionProperties.getParity());
     }
 
     private void stopMsgFilter() {