Appendix B: Pin Assignments

DB9 Serial Port Pin Description

The DB9 serial port on the switch’s rear panel is used to connect the switch to a management device. The on-board menu-driven configuration program can be accessed from a terminal, a PC running a terminal emulation program, or from a remote location via a modem connection. You can use the management port to configure port settings (e.g., enabled or disabled), or to update device firmware. The pin assignments used to connect various device types to the switch's management port are provided in the following tables.

DB9 Port Pin Assignments

 

EIA

CCITT

 

 

 

 

 

Switch's

PC DB9

Modem

 

Signal

 

 

 

 

Description

DB9 DTE

DTE

DB25 DCE

 

Direction

Circuit

Signal

 

 

 

 

 

 

 

 

 

Pin #

Pin #

Pin #

 

DTE-DCE

 

 

 

 

 

 

 

 

 

CF

109

 

 

DCD (Data Carrier Detected)

1

1

8

 

<---------

BB

104

 

 

RxD (Received Data)

2

2

3

 

<---------

BA

103

 

 

TxD (Transmitted Data)

3

3

2

 

--------->

CD

108.2

 

 

DTR (Data Terminal Ready)

4

4

20

 

--------->

AB

102

 

 

SG (Signal Ground)

5

5

7

 

---------

CC

107

 

 

DSR (Data Set Ready)

6

6

6

 

<---------

CA

105

 

 

RTS (Request-to-Send)

7

7

4

 

--------->

CB

106

 

 

CTS (Clear-to-Send)

8

8

5

 

<---------

CE

125

 

 

RI (Ring Indicator)

9

9

22

 

<---------

Connection from Switch’s Serial Port to PC’s 9-Pin COM Port

 

 

 

 

 

 

 

 

 

 

 

 

Switch's 9-Pin

 

 

CCITT Signal

PC's 9-Pin

 

 

 

 

 

 

Serial Port

 

 

COM Port

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

1 DCD

 

-

-

----- DCD

--------

1

 

 

 

 

 

2

RXD

 

<-

---- TXD

---------

3

 

 

 

 

 

3

TXD

 

-

-

----- RXD

------>

2

 

 

 

 

 

4

DTR

 

-

-

----- DSR

------>

6

 

 

 

 

 

5

SGND

 

-

------ SGND ------

5

 

 

 

 

 

6

DSR

 

-

-

----- DTR

--------

4

 

 

 

 

 

7

RTS

 

-

-

----- CTS

------>

8

 

 

 

 

 

8

CTS

 

<-

----- RTS

--------

7

 

 

 

 

 

9

RI

 

-

-

----- RI -----------

9

 

 

 

 

 

B-1

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Accton Technology 4508, CheetahSwitch Workgroup manual DB9 Serial Port Pin Description, DB9 Port Pin Assignments

CheetahSwitch Workgroup, 4508 specifications

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