diff --git a/DCCEXParser.cpp b/DCCEXParser.cpp
index 14b6bfe..2cd6c4c 100644
--- a/DCCEXParser.cpp
+++ b/DCCEXParser.cpp
@@ -316,7 +316,7 @@ void DCCEXParser::parseOne(Print *stream, byte *com, RingStream * ringStream)
              ((address & 0x01FF) != address)      // invalid address (limit 9 bits ) 
           || ((subaddress & 0x03) != subaddress)  // invalid subaddress (limit 2 bits ) 
           || ((p[activep]  & 0x01) != p[activep]) // invalid activate 0|1
-          || ((onoff & 0x01) != onoff)            // invalid onoff    0|1
+          || (onoff > 2)                          // invalid onoff    0|1|2
           ) break; 
           // Honour the configuration option (config.h) which allows the <a> command to be reversed
 #ifdef DCC_ACCESSORY_COMMAND_REVERSE