Use a 1771-KA2 Communication Adapter Module between the processor and the Data Highway. The processor is one of the Bulletin 1772 units identified for that adapter, so the adapter provides the station interface rather than the processor connecting to the network cable by itself.

Set the processor-side link for 9.6 kbaud when the connected processor is 1772-LR. The faster 91.2 kbaud setting applies to other supported processors, while 1772-LR is explicitly treated as the exception.

The normal processor operating sequence remains unchanged when the communication adapter is added. The 1772-LR continues scanning I/O and executing its user program while the adapter handles Data Highway communication.

Match the complete catalog number on the installed processor and do not substitute a shared 1772 prefix. The PLC-2 family documentation lists 1772-LR separately from 1772-LP1, 1772-LP2 and 1772-LP3, and their communication details are not interchangeable.

Count the existing controllers and computers and verify the installed cable length before adding another station. A single Data Highway cable supports up to 64 stations over a total distance of 10,000 ft (3,048 m), so both limits must remain within range.

The Data Highway architecture supports communication among programmable controllers, computers and intelligent RS-232-C devices. For the 1772-LR station, the 1771-KA2 supplies the required processor-to-network interface and must be configured as part of the complete station path.