[Transmission Type]：NB-IoT
[Interface]：RS485/RS232
[Weight]：133±5g
[Introduction]：E840-DTU (EA01) is a NB-IOT produced by Ebyte. The product has complete software functions and covers most of the conventional application scenarios. Users can make two-way transparent data transmission from the UART to the network server through simple settings.
| Features | Description |
| Frequency | B3 B5 B8 frequency bands device can automatically search frequency |
| Hardware Features | Description |
| Antenna Type | SMA |
| Data Interface | RS485 /RS232 |
| Baud Rate | Factory Default 9600bps |
| Maximum Transmitting Power | 20dBm±2dB |
| Current Consumption (Typical Value) | Send： 105mA@12V Receive： 15mA @12V |
| Working Voltage | DC 5V~36V |
| Working Temperature | -40℃- 70℃ |
| Storage Temperature | -40℃- 85℃ |
| Size | 82×84×24mm |
| RS485 /RS232 | Electrical Isolation RS485/RS232 |
| Software Features | Description |
| Wireless Data Rate | Single-tone：25.5kbps（Download），16.7kbps（Upload） Multi-tone：25.5kbps（Download），62.5kbps（Upload） |
| Network Protocol | Support TCP、UDP、MQTT、COAP、LwM2M and other protocol |
| Device ID | The device ID can be configured through AT commands |
| Pin No. | Name | Description |
| 1 | RS232 | RS232 Interface |
| 2 | 485_A | Side A of external interface for other RS485 devices |
| 3 | 485_B | Side B of external interface for other RS485 devices |
| 4 | GND | Ground electrode |
| 5 | VCC | Power supply, Default: 5~36V |
| 6 | PWR | Power indicator |
| 7 | WORK | UART communication indicator |
| 8 | NET | Networking indicator |
| 9 | DC-IN | Power adapter interface, default: 5~36V |
| 10 | RST | Reset switch (downward, reset) |
| 11 | Restore | Restore factory settings switch(downward, around 1 second） |
| 12 | SIM | SIM card slot |
| 13 | ANT | Antenna interface（SMA-K，50Ω) |
| Order online |
| 【eBay】：https://www.ebay.com/usr/cdebyte |
| 【Aliexpress】：https://www.aliexpress.com/store/2798183 |
| 【Alibaba】：https://www.alibaba.com |
| For batch order/customized product |
| 【Sales hotline】：+86-28-61399028 Ext.812 |
| 【E-mail】：service@cdebyte.com |
| Technical support |
| 【Submit online】：http://www.ebyte.com/en/apple-technology.aspx |
| 【E-mail】：support@cdebyte.com |
| Model | Interface | Transmission protocol | AT command | TCP/UDP | Package | Size(mm) | Feature | Manual | Sample | ||
|---|---|---|---|---|---|---|---|---|---|---|---|
| E840-DTU(EA01) | RS232 RS485 | NB-IoT | - | - | support | support | screwing/DB9 | 82*84*24 | two-way transparent data transmission | ||
| E840-DTU(4G-02E) | RS232 RS485 | 4G | - | - | Support | Support | DB9 | 84*82*25 | Realize two-way data transparent transmission from serial port to network | ||
| E840-TTL-4G02E | UART | 4G | - | - | Support | Support | Screwing | 42*40*9.7 | Whole network，TCP/UDP | ||
| E840-DTU(NB-03) | RS232 RS485 | NB-IoT | - | - | - | - | Screwing/DB9 | 82*84*25 | Wide coverage,Support multiple network protocols | ||
| E840-TTL-NB03 | UART | NB-IoT | - | - | Support | Support | Screwing | 42*40*9.7 | AT mode,TCP/UDP | ||
| E840-TTL-GPRS03 | UART | GPRS | - | - | Support | Support | Screwing | 42*40*9.7 | Supporting quad-frequency | ||
| E840-DTU(GPRS-03) | RS485/RS232 | GPRS | - | - | Support | Support | Screwing | 84*82*25 | Supporting quad-frequency, AT command set | ||
| E840-DTU(GPRS-01) | RS485/RS232 | GPRS | - | - | Support | Support | Screwing | 84*82*25 | Supporting quad-frequency, AT command set | ||
| E840-DTU(NB-02) | RS232 RS485 | NB-IoT | - | - | - | - | Screwing/DB9 | 82*84*25 | Low power consumption,customization |
