224

Serial interface

NOTE: In the table below, “I/O” denotes the input/output when seen from the server.

.

Pin number

Signal name

 

 

 

Meaning

I/O

 

 

 

 

 

 

 

1

DTR

 

Data Terminal Ready

 

 

 

 

 

 

 

 

2

DSR

 

Data Set Ready

I

 

 

 

 

 

 

 

3

TXD

 

Transmit Data

O

 

 

 

 

 

 

 

4

RTS

 

Request To Send

O

 

 

 

 

 

 

 

5

RXD

 

Receive Data

I

 

 

 

 

 

 

 

6

CTS

 

Clear To Send

I

 

 

 

 

 

 

 

7

CD

 

Receive Carrier Detect

I

 

 

 

 

 

 

 

8

CI

 

Call Indicator

I

 

 

 

 

 

 

 

Shield

GND

 

Signal Ground

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

8

7

6

 

 

 

 

5

 

4

3

 

 

 

 

 

 

 

2

1

 

 

 

 

 

 

 

 

 

After converting cable

 

 

 

 

 

 

 

 

 

 

 

 

 

Pin number

Signal name

 

 

 

Meaning

I/O

 

 

 

 

 

 

 

1

CD

 

Receive Carrier Detect

I

 

 

 

 

 

 

 

2

RXD

 

Receive Data

I

 

 

 

 

 

 

 

3

TXD

 

Transmit Data

O

 

 

 

 

 

 

 

4

DTR

 

Data Terminal Ready

 

 

 

 

 

 

 

 

5

GND

 

Signal Ground

 

 

 

 

 

 

 

 

6

DSR

 

Data Set Ready

I