LabJack devices support asynchronous serial communications using CMOS-level compatible logic. Standards such as RS232 and RS485 support many of the same timings as LabJack asynchronous serial features, but use incompatible logic levels. Additional conditioning circuitry is required to interface RS232/RS485 I/O with LabJack devices. See our T-series documentation below for additional information:
13.7 Asynchronous Serial [T-Series Datasheet]
Note: The DB15, DB25 and DB37 ports on LabJack hardware should not be confused with serial ports; these DB connectors are only used to expand the I/O of LabJack devices.