[Antenna Interface] : SMA-K
[Size] : 84*82*25mm
[Interface] : RS232/RS485
[Weight] : 133±5g
[Introduction] : E840-DTU(NB-02) can realize the communication between serial port device and network server via NB network. With simple AT command, users can easily use this product to achieve bidirectional transparent data transmission from the serial port to the network. The transparent transmission is between UART devices（referring to PC） and net sever (replaced by TCP testing tools).
| RF Parameter | Value | Remark |
| Frequency | Band5 | Receiving Frequency：869MHz~894MHz Transmitting Frequency：824MHz~849MHz |
| Hardware Features | Value | Description |
| Antenna Type | SMA-K | |
| Interface | RS485 / RS232 | Electrical isolation, with RS485/RS232 interface |
| Baud Rate | 9600bps | Baud rate: 1200~115200, default: 9600 |
| Max. Transmitting power | 23dBm ± 2dB | |
| Sensitivity | -129dBm ± 1dB | |
| Dissipative Flows（typical） | PSM： 3.6uA Idle： 2mA @DRX=1.28s | |
| Working voltage | DC 8V~28V | |
| Working Temperature | -40℃- 70℃ | |
| Storage Temperature | -40℃- 85℃ | |
| Size | 82×84×25mm | |
| Software Features | Description |
| Wireless Rate | SingleTone，subcarrier 15kHz and 3.75kHz：21.25kbps (downstream)， 15.625kbps (upstream). |
| Wokring Mode | Power-saving mode（PSM) Idle mode（Idle) Connection mode（Active） |
| Set Command | Abidy by 3GPP TS27.007 V14.3.0 and Quectel intensified AT command. |
| Network Protocal | Supporting multiple protocal, such as CoAP，UDP，IPv4 , LwM2M etc. |
| Device ID | Use AT command to configure Device ID. |
| Pin No. | Pin Item | Pin Application |
| 1 | GND | Ground electrode |
| 2 | VCC | Power supply，default: 8~28V |
| 3 | RS232 | RS232 interface |
| 4 | 485_A | Side A of external interface for other RS485 devices |
| 5 | 485_B | Side B of external interface for other RS485 devices |
| 6 | ANT | Antenna interface（SMA-K，50Ω） |
| 7 | PWR | Power indicator |
| 8 | WORK | UART communication indicator |
| 9 | NEL | Net working indicator |
| 10 | NC | N/A |
| 11 | RST | Reset dial switch（down，reset） |
| 12 | DC8_28V | Power adapter interface |
| 13 | SIM | SIM card slot |
| 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 |
