Multitech MTCBA-E-EN Podręcznik Użytkownika Pobierz pdf (Strona 10)

Chapter 1 – Product Description and Specifications

10 Multi-Tech Systems, Inc. MultiModem Cell User Guide

9-Pin Fem-D Sub Serial Connector

The following table explains the pin functions.

DE9 Pin Assignment

Female Connector

DE9

Pins

RS232 Signals

DCE

RS422 Full

Duplex Signals

Signal

Direction

Pin 1

Data Carrier Detected (DCD)

RxD-

Out

Pin 2

RXD

RxD+

Out

Pin 3

TXD

TxD+

Pin 4

Data Terminal Ready (DTR)

TxD-

Pin 5

Ground

N/A

Pin 6

Data Set Ready (DSR)

Ready To Send -

(RTS-)

Out – RS232

In – RS422

Pin 7

Ready To Send (RTS)

Ready To Send +

(RTS+)

Pin 8

Clear To Send (CTS)

Clear To Send +

(CTS+)

Out

Pin 9

Ring Indicator (RI)

Clear To Send -

(CTS-)

Out

Note: The DSR signal on pin 6 is always asserted by the modem.

4-Position DIP Switch

Switch Position

Up/On

Down/Off

Description

Position 1

Off

DTR Reset Disabled

Position 1

DTR Reset Enabled

Positions 2-4

Only valid for serial builds

Position 2

Off

No TXD Termination

Position 2

TXD Diff Pair Terminated

Position 3

Off

No RTS Termination

Position 3

RTS Diff Pair Terminated

Position 4

Off

RS232 Mode

Position 4

RS422 Mode

Note: Positions 2 and 3 should only be used in RS422 Mode. Enabling TXD/RTS termination may be required to avoid

errors at high bit rates or long cable lengths. Multi-Tech Systems tested the cable up to 1,000 feet , but the

maximum may be more with termination enabled and lower data rates.

1 2 ... 5 6 7 8 9 10 11 12 13 14 15 ... 28 29

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