E840-DTU(GPRS-01) Wireless IoT Solutions RS232 serial GSM/GPRS/EDGE DTU TCP/IP GSM Modem
[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).
| 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 |