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The pin assignments for the Keyspan USB 4 Port serial Adapter’s male DB9 port are illustrated below:
7.1.d – Serial Port Pin Outs
Pin Name Signal Designaon
1 DCD Data Carrier Detect (Input)
2 RX Received Data (Input)
3 TX Transmied 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 specicaons, cables, should be shielded using braided shields and
metal hoods with complete 100% contact between the shields and hoods.
External Loopback Connector Informaon
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