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Setting the Port Interface: The 8-port adapter has a set of jumpers used to select the serial
interface used by each port. The interface is selected on a port-by-port basis for each of the eight ports.
The jumper selects either an RS-232 or RS-485 interface for a given port; the default position is RS-232.
The following shows the location and port numbering of the interface-selection jumpers for the two
adapters. The adapters can be identified by the location of the option switches.
Figure 2-7. Port Numbering of Interface Selection Jumpers
Note: RS-422 is a subset of RS-485.
Position the jumper (a 2x5-position jumper) to select the interface: RS-485 or RS-232. Each port can be
configured independent of the setting of the other ports.
RS-485 RS-232
Installation and Requirements 2-11