Keyspan USA-49WLC, User Manual, Page: 32 / 43

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)
DB9 Female Loopback plug
Pin(s) Wired to Pin(s)
1 <-> 4,8
2 <-> 3
6 <-> 7,9