DB-25 LPT port Loopback mini Tester with LEDs are used to check the interface for failures and to help identify the equipment that has failed. The tester may be left in the line permanently. It is transparent to data transfer. Used to monitor the 7 most commonly used data lines to see if equipment has failed. Seven, two color LEDs check status of TD, RD, RTS, CTS, DSR, CD, DTR.
DB 25 Male/Female
Seven LED's indicate the status of the following lines: TD, RD, RTS,
CTS, DSR, DTR, and CD.
No external power required
Dimensions: 6.5 x 5.5 x 1.6 cm