B&B Electronics 9PMTT Blue network cable tester

RS-232 Mini Tester, 2 x DB9 Which RS-232 data lines are active? Know with this LED mini tester

This RS-232 mini tester is designed to connect in series with any RS-232 interface. Bright red or green LED signals clearly show which lines are active. The LEDs’ color indicates Negative or Positive voltage, with red meaning Negative, green showing Positive.

Mini Testers 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.

Seven LED’s indicate the status of the following lines: TD, RD, RTS, CTS, DSR, DTR, and CD. Model 9PMTT has male and female DB9 connectors.