Keyspan 1.9 User Manual

The pin assignments for the Keyspan High Speed USB Serial Adapter's male DB9 port are 
illustrated below:

Keyspan High Speed USB Serial Adapter's

1

DCD

Data Carrier Detect (Input)

2

RX 

Received Data (Input)

3

TX 

Transmitted Data (Output)

4

DTR

Data Terminal Ready (Output)

5

GND

Ground

6

DSR

Data Set Ready (Input)

7

RTS

Request To Send (Output)

8

CTS

Clear To Send (Input)

9

RI 

Ring Indicator (Input)

In order to ensure compliance with emission specifications, cables should be shielded using braided 
shields and metal hoods with complete 100% contact between the shields and hoods. 

external.  The external test requires the use of a special loopback connector.  This connector 
requires a "

DB9 Female Loopback plug

"

  with the following wiring:

1

<->

4,8

2

<->

3

6

<->

7,9 

This User Manual applies to the Keyspan High Speed USB Serial Adapter Software  for Mac OS. 

(rev 02may12JA) 

Page 30