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7.1.d - Serial Port Pin Outs
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
male DB9 port
Pin
Name
Signal Designation
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 Loopback Connector Information
The
Keyspan Serial Assistant
allows you to perform two types of loopback tests - internal and
external. The external test requires the use of a special loopback connector. This connector
requires a "
DB9 Female Loopback plug
"
with the following wiring:
Pin(s)
Wired to
Pin(s)
1
<->
4,8
2
<->
3
6
<->
7,9
Keyspan:High Speed USB Serial Adapter for Mac OS-v1.9 User Manual
This User Manual applies to the Keyspan High Speed USB Serial Adapter Software for
Mac OS
.
(rev 02may12JA)
Page 30