Rockwell Automation 1771-KA2 Communication Adapter Module - Manual (Page 31)

Module Installation
Chapter 3
3-7
The module is shipped with these switches set for 57.6K baud. Both
switches are set ON for this communication rate. This baud rate is the
intended Data Highway communication rate.
CAUTION: Do not set these switches for any other baud rate.
Incorrect setting of these switches may cause faulted data
transmission on the Data Highway communication link. This
may disable Data Highway operation until the switch setting is
corrected.
After rechecking all switch settings, replace the cover plate on the
module.
The I/O slot designated for the 1771–KA2 communication adapter
module should be keyed to admit only that module. Plastic keying bands,
shipped with the I/O chassis, accomplish this purpose. These keying
bands provide for only one type of module in a slot.
On the rear edge of the communication adapter module are 2 slots.
Position the keying bands on the backplane connector to align with these
slots. For the communication adapter module, position keying bands on
the upper backplane connector between these numbers printed on the
backplane:
4 and 6
22 and 24
Refer to Figure 3.5. Use needle–nose pliers to insert or remove keying
bands.
Keying