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Serial Port Signal Definitions:

Signal Name

RS-232:

DCD

DSR

RXD

RTS

TXD

CTS

DTR

RS-422:

TXD+, TXD-

RXD+, RXD-

RS-485:

TXD/RXD+

TXD/RXD-

Common to all protocols:

GND

Definition

Data Carrier Detect

Data Set Ready

Receive Data

Request To Send

Transmit Data

Clear To Send

Data Terminal Ready

Ring Indicator

Differential Transmit Data

Differential Receive Data

Differential Transmit/Receive +

Differential Transmit/Receive -

Ground

Not Connected

Direction

Input

Output

Input

Output

Input

Output

Input

Bi-directional

Jupiter-MM-SIO User Manual V1.3

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