Westermo RM-505U-K - Manual (Page 6)

505K Radio Telemetry Module User Manual
    ELPRO Technologies Pty Ltd 2008 Page 6
1 OVERVIEW
Note: Please refer to the separate 505U-2 User Manual for the 505U-2-E and 505U-2-B
products. The 505U-K product will be referred to as the “505K” for the rest of this manual
to clearly delineate it from the other 505U products.
The 505K radio telemetry module is an economical solution for the remote monitoring of
process signals. The 505K can connect to digital, pulse or analogue signals from process
transducers, and transmit these signal values by radio.
Although the 505K is intended to be simple in its application, it also provides many
sophisticated features. This manual should be read carefully to ensure that the modules are
configured and installed to give reliable performance. The 505K has been designed to use a
European licence-free radio band at 869MHz. The 505K uses the 869MHz 105U module as a
receiver, or repeater. If you have not used 105U modules before, please read the 105U User
Manual prior to reading this manual.
The 505K module is a monitoring only unit - that is, it will only accept input signals and
does not provide output signals. The 505K has an internal radio transmitter; it does not have
a receiver to receive messages from another module.
The 505K transmits the value of an input signal whenever the signal changes, and also after a
pre-configured time. Each transmission message includes error-checking to confirm the
validity of the message. At each transmission, the 505K may be configured to repeat the
transmission several times to ensure that the transmission is received correctly. This is
important if the radio path is marginal (that is, the radio signal is not strong) or if there is a lot
of radio traffic on the radio channel which may corrupt the 505K message. The 505K
transmits the input message to a 105U module, which sets an output signal to be the same
value as the 505K input, or the 105U passes the input message to another device (PC or PLC)
via its serial port.
For more information on the 105U module, please refer to the 105U User Manual.
The 505K has a heavy duty painted aluminium enclosure, weather-proof to IP66. Signal and
power connections to the unit are made via a weatherproof connector at the bottom of the
module. Antenna connection is made using a SMA coaxial connector at the top of the
module.
1.1 Input Signals
The 505K module provides two digital/pulse inputs and one analogue input for connecting to
process transducers.
Digital Signals
Examples: motor fault, tank overflow, intruder alarm
Pulse signals - use the same input as the digital input
Examples: electricity metering, fluid flow, raingauge, level from a shaft encoder
Analogue continuously variable signals (0-20mA, 4-20mA, 0-10mA, 0-10V)
Examples: measured tank level, measured process temperature
Some internal signals may also be transmitted to outputs in the network: