User guide

890 USE 108 00 August 2001 69
3
Communication Capabilities
At a Glance
Introduction The following information describes the communication features of the Compact
family.
What’s in this
Chapter?
This chapter contains the following topics:
Note: (See Compact Specifications, p. 159) for complete controller specifications.
Topic Page
Modbus Communications A984 & E984-241/251 70
Modbus Communications E984-258/265/275/285 72
Generic Modbus Communication Functions 79
Modbus Plus Communications A984-145, E984-245/255 80
Modbus Plus Communications E984-265/275/285 84
Modbus Plus LEDs 86
Generic Modbus Plus Communications 87
Modbus Plus Capabilities for Compact 88
Bridge Mode Between Modbus and Modbus Plus 91
Modbus Plus Address Routing Schemes 94
Direct, Explicit, and Implicit Attaches 97
Modbus Plus Communication Paths 99