Table 11 provides pin diagrams for converting A6748A/A6749A RS-232 DB25 Serial Port to AD278A/AD279A RS-232 RJ45 Serial Port.

Table 11: Converting A6748A/A6749A RS-232 DB25 Serial Port to AD278A/AD279A RS-232 RJ45 Serial Port

DB25 Female

Converter -

RS 232 Signal

RS 232 Signal

RJ45 Pin

Port Pin

DB25 Male

 

Description

Number

Number

Port Pin

 

 

(AD278A/

(A6748A/

Number

 

 

AD279A

A6749A

(A6748A/

 

 

Solution)

Solution)

A6749A

 

 

 

 

Solution)

 

 

 

 

 

 

 

 

Pin # 2

 

TXD

Transmitted Data

Pin # 5

Pin # 3

 

RXD

Received Data

Pin # 6

Pin # 4

 

RTS

Request to Send

Pin # 3

Pin # 5

 

CTS

Clear to Send

Pin # 8

Pin # 6

 

DSR

Data Set Ready

Pin # 2

Pin # 7

 

SG

Signal Ground

Pin # 7

Pin # 8

 

DCD

Data Carrier

Pin # 10

 

 

 

Detect

 

Pin # 20

 

DTR

Data Terminal

Pin # 9

 

 

 

Ready

 

Pin # 22

 

RI

Ring Indicator

Pin # 1

Summary

This paper discusses solutions for different cabling issues that are caused by RS-232 serial port pin- layout and port interface differences between the A6748A/A6749A serial PCI MUX solution and the AD278A/AD279A serial PCI MUX solution.

Glossary

Port Modules: Port modules are extended equipments that are used with 64-port serial MUX solution to provide RS-232 serial ports. One port module can be connected to PCI MUX 64-port adapter and others can be extended from the first port module.

Related Information

For more information about the A6748A/A6749A and AD278A/AD279A serial PCI MUX solutions, see the Multiplexers Documentation website at: http://www.docs.hp.com/en/netcom.html#Multiplexers