Serial Port Pin Outs - Keyspan USA-19H Manual

Keyspan:USB Serial Adapter for Windows-v3.4 Manual
7.1.d - Serial Port Pin Outs
The pin assignments for the Keyspan USB Serial Adapter's male DB9 port are illustrated below:
Pin
1
2
3
4
5
6
7
8
9
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
external. The external test requires the use of a special loopback connector. This connector
requires a "
DB9 Female Loopback plug
This User Manual applies to the Keyspan USB Serial Adapter Software for Windows.
Rev 03jul13
Keyspan USB Serial Adapter's
male DB9 port
Name Signal Designation
DCD Data Carrier Detect (Input)
RX Received Data (Input)
TX Transmitted Data (Output)
DTR Data Terminal Ready (Output)
GND Ground
DSR Data Set Ready (Input)
RTS Request To Send (Output)
CTS Clear To Send (Input)
RI Ring Indicator (Input)
allows you to perform two types of loopback tests - internal and
with the following wiring:
"
Pin(s) Wired to
1 <->
2 <->
6 <->
Pin(s)
4,8
3
7,9
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