SEL-4388 Mirrored Bits Tester Easily Test SEL Mirrored Bits Communications Links Reduce commissioning and repair time. Features and Benefits Save Time Quickly test communications by automatically detecting and displaying SEL Mirrored Bits information, addresses, and data rate. Easily identify cable usage. Use pushbuttons to simulate inputs to force Transmit Mirrored Bits for testing. Verify Settings Streamline commissioning by easily verifying Mirrored Bits implementation and communications circuits. Apply Easily Power the SEL-4388 with two AAA batteries or through the external power jack. This portable battery-powered tester goes everywhere. Making Electric Power Safer, More Reliable, and More Economical ®

• Connect the SEL-4388 Mirrored Bits Tester to the serial cable or fiber-optic transceiver connected to an SEL relay or processor Mirrored Bits communications port. • Verify the addressing and communications parameters for the channel through the LCD display. • Observe the state of each transmitted (TMB) and received (RMB) bit on LEDs. • Transmit test bits using the SEL-4388 pushbuttons. Power Supply Internal Two AAA batteries (Rayovac® 824 or equivalent) External Range 4-18 Vdc Optional 5 V External Supply* 100-240 Vac, 47-63 Hz (*part number 230-0601) Serial Data Port Interface EIA-232 levels Connector 9-pin...