Lantronix XPress-DR-IAP Uživatelská příručka stáhnout pdf (Strana 21)

Introduction

1.6 Screw-Terminal Serial Connectors

Table 2 - Serial Screw-Terminal Pinouts

Pin Direction Name Function

1 To XPress DR

RXD or RXA

RS-232: RXD (Received Data)

RS-422/485:RXA (Received Data -)

4 From XPress DR TXD or TXA RS-232: TXD (Transmit Data)

RS-422/485: TXA (Transmit Data -)

2 To XPress DR CTS or RXB RS-232: CTS (Clear to Send)

RS-422/485: RXB (Received Data +)

3 From XPress DR RTS or TXB RS-232: RTS (Request to Send)

RS-422/485: TXB (Transmit Data +)

8 Ground GND Ground

RXD

TXD

Rx- Rx+ Tx+ Tx-

GND

1234

Data+ Data-

GND

12 3 4

R = 120 Ohm, 1/8 W

RxD-

12 34

R = 120 Ohm, 1/8 W

RS-485 2-Wire RS-422/485 4-Wire

RxD+ TxD-TxD+ GND

Note: For RS-485 2-wire functionality, pins 1 & 4 and 2 & 3 of the screw terminals must be

connected together.

Note: Termination resistors (R = 120 Ohm) are used to match impedance of a node to the

impedance of the transmission (TX) line. Termination resistors should be placed only at the

extreme ends of the data line, and no more than two terminations should be placed in any

single segment of a RS-485 network. The terminator resistors may not be needed for your

application.

DSTni-XPress DR User Guide 1-7

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Lantronix XPress-DR-IAP Uživatelská příručka Strana 21