18. Appendix I 
18.2. Description 
R400  Experion PKS Series A Fieldbus Interface Module User's Guide  555 
July 2010  Honeywell 
Tab 
Parameter Default Value  Description 
for both Links.  
 
Some term abbreviations 
Th
e following abbreviations are listed for reference.  
AP Application Process 
DLE  Data Link Entity 
DLL  Data Link Layer - Defined in ISO 7498 
DLME  Data Link Layer Management Entity 
DLPDU  Data Link Protocol Data Unit 
FAS Fieldbus Access Sublayer 
FIM Fieldbus Interface Module 
FMS  Fieldbus Message Specification 
IRRD  Immediate Response Recovery Delay 
ISO  International Organization For Standardization 
LAS  Link Active Scheduler 
MAU  Medium Attachment Unit - For wire media MAU = transceiver 
MDS  Medium Dependent Sublayer 
NMA  Network Management Agent 
OSI Open Systems Interconnection 
PhL Physical Layer 
PhLO  Physical Layer Overhead 
PhPDU  Physical Layer Protocol Data Unit