EM911 - Wi-Fi to Serial Terminal with Digital & Analog ports

EM911, is a Wi-Fi terminal from Emwhiz Technologies which has many features that can be effectively used for wireless data acquisition, sensor networking, remote control and remote monitoring applications. It allows devices with serial ports to be connected to a Wi-Fi network and to the internet. The Digital I/Os and Analog Input ports of the terminal can be effectively used for wireless sensor networking and remote monitoring/control applications.

Salient Features

  • IEEE802.11 b/g standard
  • Frequency: 2.4 ~ 2.4835 GHz
  • Data Rate: 11 / 5.5 / 2 / 1 Mbps
  • Act as Wi-Fi - Serial bridge
  • Universal Socket connectivity
  • Embedded TCP/UDP/IP stack
  • RS232 or RS485 interface
  • 4nos Digital I/Os
  • 7nos Analog Inputs
  • Supports Ad-hoc mode
  • Built- in HTTP client mode to post or get data from web servers
  • Status indications (Power, Connection & Communication)
  • Sleep and Wakeup timers
  • Ultra -low power consumption
  • Over the air firmware upgrade (FTP)

Technical Specifications

  • Protocol : IEEE 802.11 b/g
  • Frequency : 2.4GHz License free band
  • Transmission rate (over the air) : 1 11Mbps for 802.11b / 6 54Mbps for 802.11g
  • Power consumption
    • Sleep mode : 4A sleep
    • Rx Period : 40mA RX/Connected
    • Tx Period : 200mA max TX
  • Hardware interfaces
    • UART Port : RS232/ RS485 (configurable)
    • UART data rate : 1 Mbps streaming
    • SPI slave : 2.7 Mbps streaming
  • GPIOs
    • I/O Ports : 4nos
    • Analog Input Ports : 7nos
    • ADC Resolution : 14bit
    • Analog Input Range : 0 to 5V/ 0-10V / 4 20mA
  • Security
    • HW encryption engine : WEP128, WPA-PSK, WPA2-PSK (TKIP and AES)
  • Temperature range : 0C ~ +70C
  • Other features : Real-time clock, 2KB NV RAM

Applications

  • Wireless data acquisition
  • Wireless sensor networking
  • Telemetry
  • Building Automation
  • Medical device monitoring
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