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Application Wiring
RS-485 (Transmitter is controlled by ATTA
Please note that PCI2S485 supports optional auto echo mode operation. When enabled,
data sent to the connected RS-485 transmitter is simultaneously sent to the receiver.
The current application can then use the "echoed" data to check for data collisions.
RS-422 (Transmitter buffer always enabled)
Please note that PCI2S485 supports 4-wire RS-422 mode, which requires cross-over
twisted pair cable.
PCI2S485 also provides two handshaking signals, RTS+/RTS- and CTS+/CTS- to
perform hardware flow control, which requires the following wiring scheme:
PCI2S485
Instruction Manual
Hardware)
TM
2-wire twisted pair cable
TXD+ (485)
TXD- (485)
4-wire twisted pair cable
TXD+
TXD-
RXD+ (485)
RXD- (485)
RS-422 Device
8
DATA (+)
DATA (-)
TX+
TX-
RX+
RX-
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