1
Chapter
11
Product Overview
The DH-485 Communication Interface module links host computers with
the Allen-Bradley RS-485 Data Highway (DH-485). The module supports
the protocol required to act as a node on the DH-485 network, freeing the
host computer from this task.
Figure 1.1
The DH485 Communication Interface (1770KF3)
Important: The DH-485 Communication Interface module (cat. no.
1770-KF3) will be referred to as “the KF3” or “the module” throughout the
remainder of this manual.
The host computer communicates with the KF3 over an RS-232C link
using full-duplex or half-duplex DF1 protocol. Through the KF3, the host
computer can communicate with nodes on the DH-485 network.
The DH485 Communication
Interface