IEC501A
{M dev,ser [,labtyp] [,den],jjj,sss [,dsname] [,mediatype][,no worm] | M dev,ser [,labtyp] [,trtch],jjj,sss [,dsname] [,mediatype][,no worm]}

Explanation

Please refer to the explanation in message IEC501E Explanation

Routing code

3,5/4,6

Descriptor code

2