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E90-DTU(900L20)-V8 Ebyte LoRa 868M wireless communication radio communication terminal RS232/RS485 interface
[Introduction]：E90-DTU(900L20)-V8 is a high-speed 868M wireless data transmission radio (with RS232/RS485 interface), LoRa spread spectrum technology, transparent transmission mode, working in the 862~930MHz frequency band (default 868MHz), working voltage range 8~28V. LoRa direct sequence spread spectrum technology will bring a longer communication distance, and has the advantages of concentrated power density and strong anti-interference ability. The data transmission radio has the characteristics of FEC forward error correction, data encryption and compression function, long transmission distance, and strong communication reliability.
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| PIN number | name | Function | illustrate |
| 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 press-line power interface |
| 3 | PWR-LED | Power indicator light | Red, lights up when power is on |
| 4 | TXD-LED | Send indicator light | Yellow, flashing when sending data |
| 5 | RXD-LED | Receive indicator light | Yellow, flashes when receiving data |
| 6 | DC power interface | Power interface | Direct insertion round hole, outer diameter 5.5mm, inner diameter 2.5mm |
| 7 | DIP switch | DIP switch | Working mode control |
| 8 | Antenna interface | SMA-K interface | External thread inner hole, length 10mm, characteristic impedance 50Ω |