Tripp Lite USA-19HS, Руководство пользователя, Страница: 25 / 30

Serial Port Pin Outs [DB9]
USA-19HS Pin Outs
The pin assignments for the Keyspan USB Serial Adapter's male DB9 port are illustrated below:
Pin Name Signal Designation
1 DCD DCD Data Carrier Detect (Input)
2 RX RX Received Data (Input)
3 TX TX Transmitted Data (Output)
4 DTR DTR Data Terminal Ready (Output)
5 GND GND Ground
6 DSR DSR Data Set Ready (Input)
7 RTS RTS Request To Send (Output)
8 CTS CTS Clear To Send (Input)
9 RI 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
5 < - > 7, 9
USA-19HS - User Manua l Page 2
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