Tripp Lite USA-19HS Owner's Manual for Windows v3.4 USA-19HS USB Serial Adapte - Page 29

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: Keyspan 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) 1 2 6 Wired to Pin(s) 4,8 3 7,9 Rev 03jul13 This User Manual applies to the Keyspan USB Serial Adapter Software for Windows. Page 29