DT Etherlink IV User Manual- 104 -7.2.6 Monitor (LCT, Local Craft Terminal) ConnectorType – DB-9 (D-Sub, female), 9 pins.Pin No. Signal Description1 MAJ_Alarm Major (urgent) Alarm Output(Alarm means closed contact to SGND)2 TXD Transmit data (to the modem)3 RXD Receive data (from the modem)4 NC Not Connected5 SGND Signal ground6 NC (or 3.3VDC) Not Connected (or 3.3VDC Output Voltage)7 NC Not Connected8 NC Not Connected9 MIN_Alarm Minor (not urgent) Alarm Output(Alarm means closed contact to SGND)Type – USB Type B (female, receptacle), 4 pins.Pin No. Signal Description1 + +5V2 D- Data +3 D+ Data -4 - SGND7.2.7 -48VDС ConnectorType – MiniFit, 4 pins.Pin No. Signal Description1 -PWR1 Negative power supply terminal2 PGND Protection ground3 -PWR2 Negative power supply terminal4 +PWR Positive power supply terminal
