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RS-422/485 SERIAL INTERFACE PLUS, 4-PORT
3. Card Setup
The RS-422/485 Serial Interface Plus, 4-Port Card has several jumper straps
which must be set for proper operation.
3.1 Address Selection
Each port on the Card occupies eight consecutive I/O locations. A DIP switch
is used to set the base address for these locations. The Card has a unique
addressing scheme that allows it to be completely compatible with older four
port RS-422/485 interface adapters and provide for the ability to select
address combinations more commonly used.
The first addressing scheme allows the Card to select the addresses for its
ports from a table of available address combinations.
Table 3-1 shows the addressing combinations available. If different address
combinations are required, please contact Technical Support about a custom
PAL option.