Status WRX900 Series User manual

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Contents
1 Introduction ..................................................................................4
1.1 Safety information ...................................................................4
1.2 Description.............................................................................5
1.3 Block diagram .........................................................................5
2 Identifying the instrument ersion......................................................6
2.1 Type designation .....................................................................6
2.2 Accessories Included.................................................................6
2.3 Accessories ............................................................................6
3 Basics ..........................................................................................7
3.1 Radio technology .....................................................................7
3.2 General information about radio transmission ................................8
3.3 Reception characteristic of the lambda/4 antenna...........................9
3.4 Interferences ........................................................................ 10
3.5 Function o er iew ................................................................. 13
4 Installation.................................................................................. 17
4.1 Installation site and climatic conditions ...................................... 17
4.1.1 Recei er ....................................................................... 17
4.1.2 Antenna........................................................................ 17
4.2 Dimensions........................................................................... 18
4.2.1 Recei er WRX900............................................................ 18
4.2.2 Lambda/4 antenna .......................................................... 18
4.2.3 Antenna wall holder for lambda/4 antenna ........................... 18
4.3 Recei er installation........................................................... 19
4.4 Fitting the antenna ................................................................ 20
4.4.1 Antenna installation directly on the recei er......................... 20
4.4.2 Antenna installation on the antenna wall holder .................... 20
5 Electrical connection..................................................................... 20
5.1 Installation notes ................................................................... 20
5.2 Connection diagram................................................................ 21
6 Display and key functions ............................................................... 23
6.1 Normal display (measured alues and signal quality) ...................... 23
6.2 Commissioning/start-up le el (In) (allocating the probe ID to a channel)
............................................................................................... 25
6.3 Parameter le el (PA) (Parameter configuration)............................ 27
6.4 Light diodes (independent of le el)............................................ 29
7 Recei er operation ....................................................................... 30
7.1 Normal display (ND)................................................................ 31
7.2 Channels and their Display measured alues ................................ 31
7.3 Display signal quality of the probes recei ed................................ 32
7.4 Changing to other Changing le els............................................. 33
7.5 Code interrogation ................................................................. 34
8 Configuration of the recei er .......................................................... 37

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8.1 Commissioning/start-up le el (In) .............................................. 37
8.1.1 Selection of a transmitter ID from the link list and assignment to a
channel ................................................................................ 38
8.1.2 Manual assignment of a transmitter ID to a channel................. 40
8.1.3 Assignment of a transmitter ID to a channel ia interface......... 41
8.1.4 Pre-configuration of all transmitter ID's using the setup program 41
8.1.5 Configuration of customized transmitter ID's on the transmitter
side ..................................................................................... 42
8.2 Parameter le el (PA) .............................................................. 43
8.2.1 Editing parameters .......................................................... 45
8.2.2 General parameters De ice information ................................... 46
8.2.3 Channel specific parameters.............................................. 50
9 Term definition ............................................................................ 52
9.1 General parameters................................................................ 52
9.1.1 de ice information .......................................................... 52
9.1.2 De ice data ................................................................... 52
9.1.3 RS485 interface .............................................................. 54
9.1.4 Analog outputs 1 to 4....................................................... 55
9.1.5 Relay outputs 1 to 2 ........................................................ 57
9.1.6 Modbus remote control alues FLOAT 1 to 4.......................... 58
9.2 Channel specific parameters .................................................... 58
10 Display and reset fly back ............................................................. 64
11 Setup program............................................................................ 67
11.1 General information about the setup program ............................ 67
11.2 Hardware and software prerequisites ....................................... 68
11.3 Connect PC and recei er to each other ..................................... 69
11.4 Configuration of the recei er .................................................. 70
11.4.1 Establishing the communication........................................ 70
11.4.2 Reading out the current recei er parameters ...................... 71
11.4.3 Editing recei er parameters............................................. 72
11.4.4 Transmit new parameters to the recei er ........................... 72
11.5 Customer-specific linearization ............................................... 72
11.6 OnlineChart ........................................................................ 75
12 Detect and remedy faults/errors..................................................... 78
13 Supplement ............................................................................... 81
13.1 Technical data..................................................................... 81

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1 Introduction
1.1 Safety information
General information
This manual contains information that must be observed in the interest of your
own safety and to avoid damage to assets. This information is supported by
symbols which are used in this manual as follows.
Please read this manual before commissioning the device. eep the manual in a
place accessible to all users at all times.
If difficulties occur during commissioning, please refrain from carrying out any
manipulations that could jeopardize your warranty rights.
Warning signs
DANGER!
This symbol indicates that Injury or death caused
by electrical shock can/may occur, if the
respective protective measures are not carried out.
CAUTION!
This symbol in combination with the signal word
indicates that damage to assets or data loss will
occur if suitable precautions are not taken.
Note signs
TIP!
This symbol refers to important information about
the product or its handling or additional use.
REFERENCE!
This symbol refers to Further information in other
sections, chapters or manuals.

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WRX
900
1 x RS485
1 x Setup with USB Config
Interface
AC (110 to 240) V +10 / -15 %
(48 to 63) Hz
or
AC / DC (20 to 30) V, (48 to 63) Hz
Voltage Supply
Reciever
Transmission
frequency
868.4 MHz
4 Keys for operation and
configuration
Keyboard
2- Line LCD display for the
measured value display and
configuration as well as 2
LED's as status displays
Interface
4 x (0(4) to 20) mA or (0 to 10) V
or
2 x (0(4) to 20) mA or (0 to 10) V
2 x relay max. 3 A, AC 230V
Outputs
1.2 Description
The WRX900 in combination with the WTX700 is suitable for mobile or stationary
temperature measurements. The application of radio technology in the ISM band
(industrial, scientific and medical band) 868.4 MHz results in a notable reduction
of installation work and costs. Cable connections are not required, the radio-
based sensor technology also functions in a rough industrial environment. The
supplied Lambda/4 antenna with an impedance of 50 Ohm can be screwed on
directly or fitted externally. When using the antenna wall holder with the 10
meter long antenna cable, the maximum open air range is 300 m. The received
measured values are converted in the receiver, displayed and are available as
linear current or voltage signals (0(4) to 20) mA, (0 to 10) V and via the digital
RS485 interface. For the WRX900/22 two relay outputs are provided to signal
different alarms. All receiver outputs are electrically isolated. Linkage to higher-
ranking systems, e.g. system visualization MSCADA software, is possible via the
digital interface with Modbus protocol.
Operation and configuration is possible via the keyboard in connection with a 2-
line LCD or, more comfortable, using a setup program. Thus, parameters, such as
filter constants, offset, alarms and fly back (minimum and maximum value
memory) can be separately set for each channel. For this purpose, a plug is
provided on the front for a PC interface with a USB/TTL converter for the
connection between receiver and PC.
The receiver is intended for fitting on a top hat rail 35 mm x 7.5 mm according to
DIN EN 60715. The screw-type terminals for the electric connection are arranged
at different levels. Ensure that the cable cross section does not exceed 2.5 mm2.
1.3 Block diagram
Figure 1: Receiver block diagram

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2 Identifying the instrument ersion
2.1 Type designation
WRX900/04/S1 Receiver with 4 x Analog O/P
230 V AC
WRX900/04/S2 Receiver with 4 x Analog O/P
30 V DC
WRX900/22/S1 Receiver with 2 x Analog O/P
2 x Relay O/P
230 V AC
WRX900/22/S2 Receiver with 2 x Analog O/P
2 x Relay O/P
30 V DC
2.2 Accessories Included
Operating Manual
Lambda/4 antenna, impedance 50 ohm, 868.4 MHz
2.3 Accessories
The following articles must be ordered separately:
WRX900 / Antenna Extension it
WLESS/CNFG/ IT
Software is available as a free download from www.status.co.uk. This is also
supplied on a CD as part of the USB configurator kit

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3 Basics
3.1 Radio technology
The characteristic framework conditions for each transmission system include the
available band width in the electro-magnetic spectrum and the maximum
permissible transmission capacity. These parameters define the channel capacity.
The main selection criteria for the frequency range to be used include the
requirement of a long range, interference resistance as well as the possibility to
be able to apply a customized transmission protocol in public spectrum band. The
focus when selecting the possible communication technologies is placed on
miniaturizing the transmitting and receiving circuit as well as the power
consumption, on enhancing the transmission safety and the transmission stability
as well as on saving costs of the technology involved. The use of a wireless
connection generates above all lower costs, higher flexibility and mobility as well
as simpler handling.
Taking the currently valid legislation into account and by complying with the
available norms and industrial standards, we have opted in favor of a wireless
solution for the application of the WRX900 system without a generally specified
protocol in the ISM band on the following frequencies: 868.4MHz (Europe)
Regarding the ISM band, in certain areas there are stringent regulations in place
concerning duty cycle, channel distribution as well as transmission capacity. The
various subdivisions within this frequency band are shown on the following figure
1.
Figure 1: Subdivision of the 868 MHz frequency band
The ERP power value (ERP: equivalent radiated power) value represents the
permitted transmission capacity related to a Lambda/2 dipole gain. When
utilizing the duty cycle, during the transmission pulse at a very small pulse width,

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5 ms
1000 ms = 0.005 = 0.5 %
t
S
t
G=
the transmission capacity is only generated for a very short period.
Duty cycle in percent identifies the duration of the transmission of a probe
related to 1 hour. The entire transmission time can be distributed to several
transmission intervals. As such, duty cycle given in percent represents the ratio
between transmission time and overall time.
The duty cycle is also termed pulse-to-pause ratio.
If, for instance, the transmission duration of a signal is 5 ms followed by a 995 ms
transmission pause, the duty cycle results from the following computation:
3.2 General information about radio transmission
Radio signals are electro-magnetic waves becoming weaker on their way from the
probe to the receiver (this is referred to as path attenuation). The field strength
decreases inversely in proportion to the square distance between probe and
receiver.
In addition to this natural limitation of the operating distance, a reduced
operating distance can also have further causes:
•Reinforced concrete walls, metal objects and surfaces, heat insulation
or heat protection glass with a vapor deposited metal layer reflect and
absorb electro-magnetic waves and, for this reason, a so-called radio
shadow is generated.
•Antenna is installed in too low a position - install the antenna as high
above floor as possible and ensure visibility between probe and
receiver.
The following are some reference values concerning the transmittance of radio
signals:
Material Transmittance
Wood, cement, uncoated glass (90 to 100) %
Walls/brickwork, chipboards/fiber boards (65 to 95) %
Reinforced concrete (10 to 90) %
Metal, aluminum lamination (0 to 10) %

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The maximum range between probe and receiver is 300 m in the open air when
using the antenna wall holder for the receiver. Ensure visibility between probe
and receiver to achieve optimum reception.
When installing the receiver into a switch cabinet, behind concrete walls or
ceilings, always use the wall holder and antenna cable with the receiver.
3.3 Reception characteristic of the lambda/4 antenna
From the spatial directional response pattern of the lambda/4 antenna you can
derive that optimum reception can only be achieved when the antenna is
vertically aligned. From the vertical rod, the reception is nearly identical in all
directions. The range to the top and bottom, however, is strongly limited. Fitting
the antenna wall holder including the antenna in the vertical direction upwards or
downwards is possible, horizontal installation is not recommended.
TIP!
To ensure that the reception antennas do not
influence each other, adhere to a minimum
distance of 500 mm for an optimum reception.

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3.4 Interferences
Collisions when using an excessive number of transmitters
When using a large number of probes, do not select a transmission interval which
is too low, otherwise the transmission frequency will be unnecessarily obstructed.
A too low transmission interval means a very high data volume on the selected
frequency which can lead to collisions with other probes. Telegrams can be
destroyed during radio transmission caused by collisions.
Figure 4: Telegrams of several probes can collide.
Figure 5: Collisions depending on the number of probes at a transmission interval
of 1 s
P
20.0
c 0 1° C
ID Measuring
Value
PROBE RECEIVERRADIO TELEGRAM
ID Measuring
Value
ID Measuring
Value
ID Measuring
Value
ID Measuring
Value
Fault increase
16 18 20 22 24 26 28 30
Number of probes