Application Wiring - StarTech.com PCI2S485 Instruction Manual

2 port pci rs-422/485 card with db9

Table of Contents

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)

2-wire twisted pair cable

TXD+ (485)

TXD- (485)

4-wire twisted pair cable

TXD+

TXD-

RXD+ (485)

RXD- (485)

RS-422 Device

DATA (+)

DATA (-)

TX+

TX-

RX+

RX-

Table of Contents

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