RS232 LED Link Tester Module, DB9 Male to DB9 Female.

Description 1, Connect in series with any RS-232 interface for testing a serial RS-232 data link.

Simple and easy, no oscilloscope is needed.

2, 8 double-color (red and green) LEDs indicate the logic states for respective data lines.

Green for logic HIGH and red for logic LOW.

Full RS232 spec compliant with LEDs for all 8 signals: DCD, RXD, TXD, DTR, DSR, RTS, CTS, RI.

3, No external power required.

No driver required.

Plug and play.

Jack sockets (nuts) on the tester can be unscrewed easily (with metal shell held in place) if needed to mate with another connector that has jack sockets.

4, OS Compatibility: Windows 98, Me, XP, 2000, 2003, CE, Vista, Windows 7, and Windows 8 as well as Linux and Mac OS 10.X, ect.

5, Typical application scenarios: