
Communication Layers' Attributes
Appendix D
D-2
ATTENTION: The OSI coprocessor is shipped with its
attributes pre–set to Allen–Bradley default settings. Some of
these should not be changed because it can cause severe
communication problems. For the attributes that you can
change, you should do so from the Allen–Bradley MAP Station
Manager. For details, refer to the Allen–Bradley MAP Station
Manager User’s Manual (publication 6630–6.5.2).
In some of the following tables, we refer to default settings. The two
types of defaults are defined below:
Allen–Bradley communication defaults: These are the values used
for the MAC–layer and RS–232 port configuration parameters whenever
the OSI coprocessor’s non–volatile memory is re–initialized.
user communication defaults: You have the ability to edit the MAC
layer and RS–232 port parameters via the Allen–Bradley MAP Station
Manager. If you do, those values are the user communication defaults.
These are the values the OSI coprocessor uses in place of the
Allen–Bradley communication defaults (unless the coprocessor’s switch
2 is set to ON, see Chapter 2 for details on switch 2).
We use a variety of acronyms in the following tables. You may see:
This acronym:
Stands for:
ESH
end system hello
LD
loadable device
PDU
protocol data unit
NPDU
network (layer) protocol data unit
SPDU
session (layer) protocol data unit
TPDU
transport (layer) protocol data unit
SAP
service access point
LSAP
link (layer) service access point
SSAP
session (layer) service access point
Definition of Defaults
Frequently Used Acronyms
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