[Transmission Type] : GPRS
[Power] : 30~33dBm
[Size] : 84*82*25mm
[Interface] : RS485/RS232
[Weight] : 133±5g
[Introduction] : Designed for the communication between UART and net server via GPRS, it is with easy AT setting and dual transparent transmission available.It explains how to make the simplest hardware environment and test the transparent transmission. The transparent transmission is between UART devices（referring to PC） and net sever (replaced by TCP testing tools).
| RF Parameter | Description |
| Wireless Standard | GSM/GPRS/EDGE |
| Standard Frequency | 850/900/1800/1900MHz |
| Transmission Power | GSM900 class4 (2W), DCS1800 class1 (1W) |
| GPRS Terminal Class Device | ClassB |
| GPRS Multi-slot Class | GPRS Class 10 |
| GPRS Coding Schemes | CS1~ CS4 |
| Hardware Characteristics | Description |
| Antenna Interface | SMA-K |
| Data Interface | RS485 / RS232 |
| Baud Rate | 2400bps- 115200bps |
| Working Voltage | DC 5V~36V |
| Working Current | 59mA~65mA(12V) |
| Storage Temperature | -40℃-85℃ |
| Working Temperature | -40℃-70℃ |
| Size | 82×84×24mm |
| RS485/RS232 | Electric isolation,RS485/RS232 |
| Software Characteristics | Description |
| Wi-Fi | GSM/GPRS/EDGE |
| Mode | Transparent Transmission |
| Command Setting | Local AT command, remote configuration command |
| Net Protocols | TCP/UDP |
| Heat Beat Packet | Configurable heat beatcycle and content |
| Device ID | Configurable Device ID(ConnReg) |
| Configurable Responding Time | Configurable sever responding time |
| Configurable Reconnection Gap | Configurable reconnection gap |
| DNS | Yes |
| Pin No. | Pin Item | Pin Application |
| 1 | GND | Ground electrode |
| 2 | VCC | Power supply 8V-28V DC |
| 3 | RS232 | RS232 communication interface |
| 4 | 485_A | Side A of eternal interface for other RS485 devices |
| 5 | 485_B | Side B of eternal interface for other RS485 devices |
| 6 | ANT | SMA-K，50Ω |
| 7 | PWR | Power indicator |
| 8 | WORK | UART communication indicator(different color for transmitting and receiving) |
| 9 | NEL | Net working indicator |
| 10 | RST | Reset switch(powered off when pulled down) |
| 11 | BAUD | UART baud rate reset switch（Reset after pulled down） |
| 12 | DC8_28V | Power adaptor 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 |
