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E90-DTU(2G4L27) RS232/485 lora wirelss modem military-grade LoRa modulation technology
[Introduction]：E90-DTU (2G4L27) is a data transceiver with military-grade LoRa modulation technology. With multiple transmission modes, it works in the frequency band (default 2424MHz). The transceiver provides transparent RS232/RS485 interface and supports 8～28V voltage input.
| No. | Name | Function | Note |
|---|---|---|---|
| 1 | DB-9 female socket | RS-232 interface | Standard RS-232 interface |
| 2 | 3.81 terminal block | RS-485, power interface | Standard RS-485 interface and pressure line power interface |
| 3 | PWR-LED | Power LED | Red, lit when the power is on |
| 4 | LINK-LED | Data transceiver LED | Yellow, the connection is successful |
| 5 | DATA-LED | Serial data LED | Yellow, flashing during data transmission |
| 6 | DC power interface | Power interface | In-line round hole, outer diameter 5.5mm, diameter 2.5mm |
| 7 | DIP switch | Mode selection | M1=upward dialing, configuration mode when M0 isarbitrary, M1=downward dialing, transparent transmissionmode when M0 is arbitrary |
| 8 | Antenna interface | SMA-K interface | external thread, 10mm, 50Ωcharacteristic impedance |