Eltek TU 1004 User Instructions Download Page 1

Eltek TU 1004 User Instructions for RC250 receiver

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RxConfig software

RxConfig can also be downloaded from: www.eltekdataloggers.co.uk
When installed, RxConfig creates a folder “Eltek”. In this folder are the 

RC250 documents for details of Modbus over serial, etc. for Modbus 
limitations.

The program allows the user to:- 

RC250 receiver with serial and Modbus output
Antenna (basic whip) – Eltek type UHFFlexi/SMA 
MP12U5W power supply with regional adaptor
LC68 – RC250 to PC serial lead
USB to serial converter lead 
LCTX3 – Transmitter to PC serial lead
RxConfig software

Read transmitter settings
Set the transmitter interval
Associate an RC250 Channel with a specific transmitter channel
Meter configured RC250 channels

Operation

Power Requirements

The  RC250 works by first receiving a data 'packet' from a transmitter, verifying it, then 

storing it to be read by the external device or PC. It is verified by means of a checksum 
contained in the message and the associated transmitter number. 

If the RC250 does not receive a message from a transmitter within a configured time, the 
stored value will be set to “no data”. For more detail see P6 “No Data interval”.

Example application: Typically data from the RC250 to the PC is updated every 30 
minutes, so the transmitter interval is set to 5 minutes (that this PC update period ÷ 6) 

and the “No Data” interval to 2 hours. (that is PC update period x 4). If the transmitter 
stops transmitting for any reason the PC should register this fact after 2 hours.

The RC250 requires permanent AC mains connection. Use only the AC power supply type 
MP12U or the provided MP12U5W. Built-in Ni-Mh batteries provide up to 3 days standby 

in the event of power failure. A fully discharged battery is charged in 72 hours. Once the 
batteries become low the RC250 will switch itself into a low power mode and turn off the 

receiver. 

 will appear in the display.

Note: the RC250 is despatched in the 

 mode.

The RC250 will power up (turn on) next time external power is applied. The display will 
then switch to working mode. The RC250 can be turned off by removing the external 
power and then clicking 

>

 or briefly pressing the concealed 

switch accessed through the case rear.

OFF

OFF

Tools  Turn Receiver Off

Page 1 of 8

Summary of Contents for TU 1004

Page 1: ...ot receive a message from a transmitter within a configured time the stored value will be set to no data For more detail see P6 No Data interval Example application Typically data from the RC250 to th...

Page 2: ...n the top of the RC250 Indicates the receiver has successfully received a valid data packet A single serial port on the PC can be used but this will mean having to change over the LCTX3 lead and LC68...

Page 3: ...es for ModBus communications See ModBus Configuration section Buttons Get TX Get the current configuration from the Transmitter Set Interval Set TX Interval use the drop down menu Set Sensor On Time A...

Page 4: ...equired Get the current or start a new RC250 Configuration using the button you should see the details appear in the right hand list box Now connect each transmitter to the PC using an LC TX3 programm...

Page 5: ...communications and should be investigated Nbr TX Is the number of successful transmissions received indicating reliability of performance and is for statistical purposes only Columns in the RX Config...

Page 6: ...ss Base address of Holding Registers containing age of each value When reading the values from the RC250 the only Function Code that can be used is Read Holding Registers 0x03 The registers containing...

Page 7: ...meaning 49 3 RH CRC Hi ac CRC Lo d9 Raw Reg Address Values other than pulse counts contain values less than 65000 Numbers starting from 65441 0xFFA1 are used to represent out of range or fault condit...

Page 8: ...dard optional accessory type LW ANT SMA The maximum recommended lead length is 10m Antenna compact Yagi Lightweight 3 element Yagi providing up to 6db gain optional supplied with 5m lead and plug Temp...

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