Wireless Modem Module RS-232/RS-485 Interface


SST-2400EXT is a spread spectrum radio modem with RS-232/RS-485 interface port. It is designed for data acquisition and control application between host and remote sensors. It is also useful for those applications, the cable wire is inconvenient to be installed. The SST-2450 can be used in not only peer to peer mode but also multi-point structure.

Based on direct sequence spread spectrum and RF technology operating In ISM bands. The Frequency Range is 2410.496MHz~2471.936MHz. The Channel Spacing is 4.096MHz.

Basically the SST-2450 is the same with SST-2400. The most different is the setting method. SST-2400 is set by jumper, and the SST-2450 is set by software utility. The new SST-2450 can also work together with this SST-2400 if you change the inside 8051 chip of SST-2400. Just contact us, then we will ship a new chip which is with a new firmware.


  • Half-duplex up to 57600bps

  • Auto band -rate setting

  • ISM band

  • Full-duplex or half-duplex

  • Spread Spectrum technology


  • Frequency Range:  2.4GHz (2410.496MHz ~ 2471.936MHz)

  • Channel Spacing:  4.096MHz

  • Output Power:  0.1W

  • Transmit power :  19dBmg2dBm

  • Modulation technique:  GMSK

  • Radio technique:  Direct sequence spread spectrum

  • Duplex Mode:  TDD (for Full-duplex)

  • Number of channel:  16

  • Number of PN code:  16

  • PN code rate:  1.365 Mchips /sec.

  • Communication distance:  Depend on external antenna, default is 300M

  • Maximum data transfer rate in asynchronous mode:

    Full-duplex mode: 9.6Kbps

    Half-duplex mode: 28.2K

  • Maximum data transfer rate in synchronous mode:

    Full-duplex mode: 19.2Kbps

    Half-duplex mode: 57.6K

  • Setting Method:  Software setting

  • Antenna:  Can bend

  • Data Format:  N,8,1 or E,8,1 dependent on software setting

  • Data bit error rateè Antenna: < 1/1000@ -102dBm

  • Input voltage: 10~30V DC

  • Input current: Typical then 250mA

  • Consumption: Transmission : 1.5W

                               Receive : 0.5W

  • Size: 106mm (L) x 76mm (W) x31mm (H)

  • Weight: 200g

  • Operating temperature: -10oC~50Co

  • Operating humility: 0~90%

  • SST-2450 can work together with SST-2400(Change the 8051 chip of SST-2400).

Gain Pattern


H-Plane for Vertical Polarization


E-Plane for Vertical Polarization



Press <here> to see the Wireless Application.

Ordering Information


2400MHz wireless modem

Output Power: 0.1W

Communication distance: depend on external antenna



1Km external antenna for SST-2450


1Km external antenna for SST-2450


5Km external antenna for SST-2450