Serial Communication Converters & Adapters Instruction Manual
41
Connections
The PDA8485 is powered by the USB port.
The PDA8485 can be configured for either a four-wire or two-wire net-
work. Figure 24 details the wiring connections from the PDA8485 to an
RS-422/485 serial device in a four-wire network.
Figure 24. Connections for PDA8485 in a Four-Wire Network
Figure 25 details the wiring connections from the PDA8485 to an
RS-422/485 serial device in a two-wire network when the DIP switches on
the PDA8485 have been set to the “2-Wire Mode”.
Figure 25. Connections for PDA8485 in a Two-Wire Network
The PDA8485 internally connects the /DI to the /DO and the DI to the DO
when the DIP switches are set to “2-Wire Mode”. Either the /DI or /DO
could be used to connect to /DATA and either the DI or DO could be used
to connect to DATA.
PDA8485 to RS-422/485 Serial
Device Four-Wire Connections
PDA8485 Serial
Converter
RS-422/485 Serial
Device
DO
DI
DO
DI
DI
DO
DI
DO
PDA8485 to RS-422/485 Serial
Device Two-Wire Connections
PDA8485 Serial
Converter
RS-422/485 Serial
Device
DO
DATA
DO
DATA
