E840-DTU (GPRS-03) industrial grade quad-band GSM/GPRS digital radio serial port devices and network servers to transmit data
[Transmission Type]：GPRS
[Power]：30~33dBm
[Size]： 84*82*25mm
[Interface]： RS485/RS232
[Weight]：136±5g
[Introduction]：E840-DTU (GPRS-03) is a product developed for serial port devices and network servers to transmit data through each other through the network. This product uses the standard AT command, which enables transparent transmission between devices and servers. The cloud platform built by Ebyte can realize the free networking mode.
| Pin No. | Pin Item | Pin Application |
|---|---|---|
| 1 | RS232 | RS232 interface |
| 2 | 485_A | Side A of eternal interface for other RS485 devices |
| 3 | 485_B | Side B of eternal interface for other RS485 devices |
| 4 | GND | Ground |
| 5 | VCC | Power supply 8V-28V DC |
| 6 | PWR | Power indicator |
| 7 | WORK | UART communication indicator |
| 8 | NEL | Radio network working indicator, no light:Initializing, slow flashing: access to the base station, fast flashing:initialization is not successful, always on: access server |
| 9 | DC8~28V | Power adaptor interface, range: 8~28V |
| 10 | RST | Reset（downward，reset） |
| 11 | Restore | The radio operating DIP switch (downward, factory reset) needs to be operated in 3s-10s. |
| 12 | SIM | For SIM card |
| 13 | ANT | Antenna （SMA-K ，50Ω impedance match） |