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WMO-400S Series High Performance Modem

WMO-400S Series High Performance Modem

Quick Overview

The WMO-400S Series Radio modems are a range of high performance modems. The modems have the ability to transfer data at 19.2kb/s over distances up to 100Km using a frequency range between 430 - 490MHz bands which are licenced and licence-free radio channels. The unit features two RS232 and one RS485 connection, (two data ports and one configuration port).
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The WMO-400S radio modem provides RS232 or RS485 connections by radio. It provides are wireless connection between a PLC and remote dataloggers, sensors and supervisory computers.

The WMO-400S has been designed to be easy to use and simple to install. It operates in the frequency range of 430-490MHz, with low and high transmitter power and a maximum achieveable range of up to 60 miles (100Km). Each modem can operate as a repeater and to a serial device, allowing the units to optimise the network and an increased range.


  • Provides wireless connectivity for serial devices
  • User-configurable frequency and RF power
  • Remote configuration and diagnostics
  • Supports wide range of network topologies
  • Distances of up to 100km (60 miles) achievable
  • Link status indication available as an output
  • Repeater capability

Serial Port

Port types: 1 x RS485 (1.2 to 187.5 kb/s),1 x RS232 (1.2 to 115.2 kb/s) and a second RS232 port for configuration/diagnostics.
Data Configuration: 7/8 data bits, 1/2 stop bits, odd/even/no parity

Digital Input/Output

One I/O channel
Input voltage-free contact / Output FET 30V DC 500mA
DI can be transmitted to remote DO
Also used for alarm output, or powering up local devices, or hot redundant standby control.

Radio Specifications

Frequency: 430 - 490MHz radio transceiver, half-duplex or simplex operation. Up to 9.6/19.2 kb/s wireless data (12.5/25 kHz channels)
Frequency configurable: 5/6.25 kHz steps within ±10MHz band
Frequency tolerance: +/-1.5 ppm over temperature range
Configurable transmitter power: 10 to 500mW, 0.5 to 5W
Data modulation: DFSK, GMSK, 4-level FSK
Duty cycle: 50%, 30 second maximum transmission time, also limited by configurable timeout and internal thermal shutdown protection
Receiver sensitivity: –112dBm @ 10E-3
BER–120dBm @ 12dB SINAD
Lightning protection: Internal gas discharge arrester



Temperature Range: -30°C to +60°C
Humidity: 0 to 99% non-condensing

Input Power

Supply Voltage: 11 to 30V DC
Battery Charger: Float charge voltage 13.8V DC with current limit set to 1.6A (minimum supply voltage 15V)
Low power sleep mode: configurable using DTR control


Housing: Powder-coated, extruded aluminium
Dimensions: 140 x 114 x 30mm
Mounting: 'T' section 35mm DIN rail to EN 50022
Weight: 0.4 kg

Availability: In stock

Price range : £646.00 - £746.00

Price as configured: £646.00

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Price as configured: £646.00


Part Builder

Description       WMO-400S Series, High Performance Modem for Industrial Wireless Applications. Power supply 11-30vDC. One RS232 & RS485 data ports plus one RS2232 for configuration and diagnostics.

Components / Downloads

For further information, technical advice, or a quotation please call or email us. If you are not sure which product you need one of our technical sales advisors will be happy to discuss your application. We also accept company purchase orders by fax or post. Credit card orders can also be placed over the phone for any product.

WMO-400S Series, High Performance Modem for Industrial Wireless Applications. Power supply 11-30vDC, frequency range between 430-490MHz (adjustable +/-10MHz) with a configurable transmitter power from 10-500mW in narrow and wide bandwidths.
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