RFU-433-RU400 (433 MHz RS-232/RS-485 Wireless Modem) User Manual, Version 1.00
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1. Introduction
The RFU-433-RU400 is an RS-232/RS-485 to 433 MHz radio modem
that can be used to convert data from an RS-232/RS-485 device to RF
message and transmitted in transparent mode via the 433 MHz ISM
frequency band.
The RFU-433-RU400 provides a maximum line of sight (LOS)
transmission distance of 399 meters at an RF Baud Rate of 9600 bps. In
order to overcome the interference that may be encountered in harsh
environments, the RFU-433-RU400 allows the RF transmission Baud Rate
to be configured to a minimum of 650 bps, enhancing the capability of the
modem to resist noise and other interference. Additionally, the RF
channels and Group IDs are adjustable, which is helpful when attempting
to avoid interference encountered when two RFU-433-RU400 networks
are adjacent. The 16 RF channels and 8 Group IDs can be configured in
order to distinguish and control the different RFU-433-RU400 networks.
The majority of these configuration parameters can be adjusted using a
combination of the Rotary and DIP switches, thereby providing a simple
method of maintaining the system if the RFU-433-RU400 modem needs
to be replaced.
