Rockwell Automation 1770-KF2 Data Highway or Highway Plus Interface Module User Manual - Manual (Page 5)

Chapter
1
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Introduction
A 1770-KF2 Series B module is a communication interface that links
intelligent RS-232-C or RS-422-A (asynchronous) devices to an
Allen-Bradley local area network. By setting switches on the KF2, and
changing cables, you can direct communications over a Data Highway or
a Peer Communication Link (PCL). With a 1770-KF2 module, a
computer on a PCL can communicate with any PLC-5 node on the
network. Other current Allen-Bradley products that communicate over a
PCL are the 1784-T50 Industrial Terminal System and the 1785-KA
Communication Adapter Module.
The KF2 is designed to operate in a control-room environment on a
tabletop. It takes its power from an AC wall outlet, and it gives you a
choice of full-duplex or half-duplex protocol on its asynchronous link.
The module has Data Highway compatibility, and it supports all PCL
facilities except internetworking.
(Internetworking would indicate that a computer on a PCL could talk to a
node on another PCL, or to a station on a Data Highway link. That may
be possible in the future, but it isn’t right now. A computer on a Data
Highway, though, using a 1770-KF2 and a 1785-KA can communicate
with PLC-5s on a PCL.)
This manual describes installation, operation, and communication
protocols of a 1770-KF2 module; and it assumes that you are already
thoroughly familiar with how to program your computer or other
intelligent asynchronous device. It does not assume prior knowledge of
the Allen-Bradley Data Highway or a Peer Communication Link.
Table 1.A lists related documentation that might be helpful in conjunction
with this manual. For more details about the programming and operation
of specific Allen-Bradley programmable controllers, refer to the
appropriate user’s manual for that controller.
General
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