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NEXCOM MPPC 2120T User Manual

Page 37

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Copyright © 2012 NEXCOM International Co., Ltd. All Rights Reserved.

21

Chapter 2: Jumpers and Connectors

MPPC 2120T/3220T User Manual

6

1

5

9

COM2 Port (Isolation with RS422/485)
Connector type: DB-9
Connector location: COM2

Pin

Definition

Pin

Definition

1

DCD#: Data Carrier Detect

2

RXD#: Receive Data

3

TXD: Transmit Data

4

DTR#: Data Terminal Ready

5

GND

6

DSR#: Data Set Ready

7

RTS#: Request To Send

8

CTS#: Clear To Send

9

RI#: Ring Indicator (could be a 5V
or 12V power pin)

RS232

Pin

Definition

Pin

Definition

1

TXD-: Transmit Data Negative

2

TXD+: Transmit Data Positive

3

RXD+: Receive Data Positive

4

RXD-: Receive Data Negative

5

GND DCD#: Data Carrier Detect

6

RTS-: Request To Send Negative

7

RTS+: Request To Send Positive

8

CTS+: Clear to Send Positive

9

CTS-: Clear To Send Negative
(could be a 5V or 12V power pin)

RS422

Pin

Definition

Pin

Definition

1

TXD-: Transmit Data Negative
RXD-: Receive Data Negative

2

TXD+: Transmit Data Positive
RXD+: Receive Data Positive

3

Reserved

4

Reserved

5

Reserved

6

Reserved

7

Reserved

8

Reserved

9

Reserved (could be a 5V or 12V
power pin)

RS485

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