|Darca Heritage V1 Software||TD1031|
|Darca Heritage V2 Software||TD1095|
|Darca Secure Software||TD1115|
|GenII Heritage Monitoring And Analysis||TD1100|
|1000 Series Squirrel||TD1010|
|450/850 Series Squirrels||TD1090|
|651 Energy Audit Squirrel||TD1114|
|Energy Series Squirrels||TD1040|
|Energy Monitoring Squirrels||TD1125|
|RX250DAC - Receiver / Logger||TD1075|
|WSR - Wireless Sensor Receiver||TD1082|
|GS41AV - Air velocity measurement||TD1111|
|GD40A - Energy monitoring using CTs||TD1102|
|GD43 - Temp/RH & CO2 transmitter (inputs for external sensors)||TD1084|
|GD47 / GW47 / GD47A - Air quality transmitter (built-in sensors for temp/RH and CO2)||TD1096|
|GC60F - Flood sensing transmitter||TD1087|
|GC62 with people counter sensor||TD1088|
|GD62/7/8 - Energy monitoring with pulse transmitters||TD1108|
|GD72E - UV & visible light transmitter||TD1093|
|GD84 - Differential pressure transmitter||TD1080|
|GD93A - MBus transmitter for use with Landis & Gyr Heatmeters||TD1116|
|GD90A - Energy monitoring system||TD1097|
|GD900A - Multidrop energy monitoring system||TD1107|
|OD41A - Pyranometer transmitter in weatherproof enclosure||TD1109|
|TMET - Weather monitoring system||TD1101|
|OD04 - External thermistor transmitter in weatherproof enclosure||TD1122|
|OD43JS - Mini weather station with GD43JS transmitter||TD1113|
|OD13E and OD14E - External RH and temperature transmitter in weatherproof enclosure||TD1128|
|ELCC - AC Transducer for GC60, GD24, GD34||TD1091|
|EC Series transmitters||TD1129|
|GenII Telemetry System||TD1079|
|Energy Monitoring System (GD-90A)||TD1097|
|Multidrop Energy Monitoring System (GD-900A)||TD1107|
|Compost Monitoring System||TD1110|
|Built Environment System||TD1119|
|Tilt and crack monitoring with GenII Transmitters||TD1120|
|Moxa NPort 5110 setup||TU1029|
|RX250AL and GenII Transmitters Quick Start||TU1008|
|WSR Wireless sensor receiver||TU1006|
|GC62 Pulse transmitter||TU1003|
|GenII quick start||TU1008|
|GS41A Pyranometer transmitter||TU1010|
|GC62A Pulse transmitter||TU1011|
|GS42 / GS42E Voltage / current transmitters||TU1019|
|GS44 / GS44E Voltage / current transmitters||TU1020|
|GS42H / GS44H Bipolar Voltage for Hukseflux Heatplate||TU1055|
|GC60Y Enhanced count transmitter||TU1021|
|GD90A Energy monitoring transmitter (NDRail350)||TU1023|
|GS42AVE/GS44AVE Averaging transmitter||TU1026|
|TMET Weather transmitter (with WXT520 sensor)||TU1032|
|TMET Weather transmitter (with WXT530 sensor)||TU1073|
|LS50 with GenII transmitters||TU1033|
|GC60 State inputs transmitter||TU1035|
|GD68 Pulse input transmitter||TU1036|
|GW47 CO2, RH and temperature transmitter||TU1037|
|GD47A CO2, RH and temp transmitter with Alkaline batteries||TU1070|
|GD40A Current (CT) transmitter||TU1038|
|GD43JA used with Kipp and Zonen NRLite net radiometer||TU1041|
|GD900A Energy monitoring transmitter (multi NDRail350)||TU1043|
|GD93A used with T230||TU1045|
|GD32ALS / GD34ALS transmitters||TU1047|
|GS41AV Air velocity transmitter||TU1049|
|GD900F Energy monitoring transmitter (Smartrail 835mV)||TU1050|
|GD24ALDM / GD34ALDM temperature transmitters with audible and visual alarm||TU1057|
|GD43E RH/temp and voltage/current transmitter||TU1059|
|OD17EE Customised RH, temp and CO2 battery powered transmitter||TU1061|
|OD18W wind speed/direction transmitter||TU1064|
|EP85 customised K type thermocouple and differential pressure transmitter||TU1069|
|RHT10D digital RH and temperature probe||TU1001
|RHT10E digital RH and temperature probe||TU1056|
|Eltek Squirrels with Vaisala WXT and WMT weather sensors||TU1022|
|EE08 RHT probe with GenII transmitters||TU1024|
|Rotronic HC2-S3 probe with GenII transmitters||TU1025|
|LS50 with GenII transmitters||TU1033|
|LS70 with GenII transmitters||TU1034|
|Darca Heritage Version 1||TM1030GB|
|Darca Heritage Version 2.0||TM1032GB|
|Darca Heritage Version 2.1||TM1038GB|
|450/850/1000 Series and GenII Loggers - German||TM1033DE|
|450/850/1000 Series and GenII Loggers - French||TM1033FR|
|450/850/1000 Series Squirrel - English (newer version, updated 12-11-13)||TM1034GB|
|RX250AL and GenII Manual||TM1035GB|
|RC250 Receiver System||TM1039|
|Adding transmitters to a remote system
|Web page||Online radio coverage survey tutorial||TN125|
Download a zipfile containing high-res images of the full Eltek product range.
Frequently Asked Questions:
- Problem: My PC can no longer communicate with the logger since I upgraded to Windows 10
- What is the best way to contact a logger remotely using GSM?
- What are Darca's System Requirements?
- Why can't I establish a connection to the Squirrel from Darca?
- How do I configure a Squirrel Modem?
- How do I use AT Commands to set up a modem?
- I have problem establishing a connection with a logger attached to a GSM modem.
- I have problems with connection reliability when using Darca with an instrument attached to a GSM modem.
- What operations are not possible with Eltek Squirrels?
- How does the logger store data from pulse transmitters?
- Problem: The help does not work in Windows Vista /Windows 7.
- Problem: The Tx interval on GenII transmitters resets to 5 seconds
- Which mathematical formulae can I use in Darca Heritage?
Users who have upgraded to Windows 10 and are using older RS232/USB adaptors supplied by Eltek may find that the unit RS232/USB does not function after the upgrade. Older RS232/USB adaptors cannot be readily physically identified as different from later devices, but their status can be checked within Windows 10.
To check the operational status of the adaptor within windows, type Device Manager into the Windows 10 search box and click Device Manager (Control Panel).
Eltek's RS232/USB adaptor is identified under the Ports section as Prolific USB-to-Serial Comm Port. Older (non functioning) adapters will have a yellow triangular symbol next to them:
Right clicking the older, non-functional device and choosing Properties will show the following status:
Eltek's recommended fix is to obtain a new, guaranteed device from Eltek. This can be supplied from stock at GBP15.00 including next day carriage but excluding VAT. Payment can be made by card.
Alternatively, for users with a high level of technical knowledge, the following link can be reviewed:
Please note: Eltek does not offer technical support relating to this link.
On the logger side
Use the Eltek GSMSQ kit. This kit contains a GSM modem which arrives configured for use with Eltek telemetry or conventional Squirrel 1000 series data loggers. No adjustment is necessary. Packed in the box is the following:
- Wavecom Extend modem
- Mounting tabs
- Logger to modem lead (type GSM-mdm-com2X)
- Antenna with 1.8m lead
- SMA connector
- User instructions
A SIM is NOT included. The SIM can be a low cost contract SIM as data is via the voice channel of the GSM network.
The GSM modem is powered by the logger external supply. Therefore an external supply must be used with the logger, e.g. the MP12U power supply. If the external power fails the logger will continue to function but GSM functionality will be lost.
The GSM modem is used to deliver text messages, contact the logger, make logger set-up changes and download data from the logger memory.
To use the GSM modem for remote access via the GSM network and/or Alarm SMS texting, plug the supplied lead (type GSM-mdm-com2X) into the GSM modem and connect the other end to the "output" socket of the logger.
On the PC side
It is recommended that the PC is equipped with a dedicated GSM modem (e.g. Eltek's GSMPC), which means that only the voice number is required for communication. If the PC is connected to the mobile network via a land line, an analog data number must be used. These data numbers are allocated by the SIM provider and are often difficult to obtain. When the PC is equipped with a dedicated GSM modem such as the GSMPC kit, however, then the remote logger GSM and PC GSM are communicating directly. This avoids the need for an analog data number altogether.
The Eltek GSMPC kit consists of the following:
- Wavecom Xtend modem
- Modem to PC serial lead (type LC-PC/MDM)
- AC to 12V DC power supply (type MPGSMextend)
A SIM is not included. The SIM can be a low cost contract SIM as data is via the voice channel of the GSM network.
Following the user instructions provided with the kit will quickly get you going.
- PC running Windows 98/ME/NT/2000/XP/Vista/7
- CDROM drive (for installation)
- 16Mb RAM
- 8Mb free hard disk space for program
- Additional hard disk space for data
- VGA (or better) display
- One unused serial port (or USB slot if used with a USB to Serial Converter)
- LC68 cable
- Eltek 1000 Series / RX250AL Squirrel
There are a number of reasons that this problem could occur:
- The Squirrel does not have a power source (either batteries in the Squirrels battery compartment or an external mains power supply (MP12U).
- The Squirrel is not asleep. To correct this, select OUTPUT mode and wait 3 seconds for the Squirrels display to go blank.
- You are trying to connect to a networking Squirrel but have not selected the Networked Squirrel option in the Settings|Communications dialog.
If you are using a Modem connection:
- The Modem is not connected to your PC.
- The Modem is not connected to your phone line.
- The Squirrel is not connected to the remote modem by an LC69 cable.
- Your Modem is not installed in Windows properly. Check the Modems section of Control Panel.
- The remote Modem has not been configured correctly.
If you are using a Direct connection:
- The Squirrel is not connected to your PC by an LC68 cable.
- The LC68 cable is plugged into the wrong COM port check your settings in the Settings|Communications dialog.
- The baud rate is set wrong in the Settings|Communications dialog. All 1000 series / RX250AL Squirrels manufactured since the year 2000 will communicate at 38400 baud or slower.
It is very important to correctly configure the modem that is going to be connected to the Squirrel. Most problems involving Darca and modems can usually be traced to the Squirrels modem not being set up.
Connect the modem directly to the computer using the RS 232 port, which is usually at the back of your computer and labeled Comm 1 or Comm 2. To configure this modem you will need to use a simple terminal emulation program such as Windows Terminal. You can then send AT commands to the modem in order to configure it in the way you require. When using such a program, be sure to set it to the correct Comm port, and to the baud rate which you will be using once the modem is connected to the Squirrel.
Unfortunately, as each manufacturer has their own version of the AT command set, this help file cannot list the necessary commands for your particular modem. However, most modern modems have sensible defaults and clear instruction manuals.
IMPORTANT: These guidelines assume that all the modems settings are the factory defaults. If this modem is brand new, then this is probably so. If not, look up how to restore the defaults in the modems handbook. On some modems, some of the settings described below may require a tiny DIP-switch to be set, rather than an AT command to be sent. Occasionally, a manufacturer will put more than one factory default profile in the modem. In this case, make sure that the profile has auto-baud rate negotiation and hardware (not software) flow control. N.B. references to RTS/CTS mean hardware flow control, which is appropriate. References to XON/XOFF mean software flow control, which would be unsuitable.
These instructions assume you have a new, high-speed modem with a data input buffer of at least 1k. Most modern modems conform to this requirement.
- Ensure that the baud rate in the terminal emulator you are using is set to a baud rate that is compatible with the Squirrel. This is typically 19200 baud.
- Leave the modems hardware flow control enabled. The Squirrel cannot use flow control, but the data packets that it sends are so small they will fit into the modems input buffer without over-filling it and causing the transmission of flow control signals. The error correction and data compression can also be left enabled.
- Since Darca will ultimately be dialing this modem up, it needs to
be told to automatically answer any calls. Thankfully, this is always
done with a particular S-register (S0). So, to set the modem to answer
after 2 rings, the following should be sent:
0 ATS0=2 [Enter].
Should you require the modem to answer after 4 rings, substitute the 2 for a 4. Some modems require a DIP-switch to be set to enable auto answering.
- This new configuration must be saved in the modem so that whenever
the power to the modem is turned on this new profile will be used. It
is important to make sure that the baud rate at which you send the following
command is compatible with your Squirrel (i.e. 19200 baud or slower
for 1000 Series / RX250AL Squirrels), as you are also storing this baud
rate along with the settings that have changed in points 2 & 3.
The exact AT command will depend on your modem, but is typically:
A. Make sure the communication baud rate is set to 9600 in Darca. At other speeds the logger may not 'wake up' reliably.
Q. I have problems with connection reliability when using Darca with an instrument attached to a GSM modem.
A. Due to the nature of GSM you are more likely to get checksum errors on data from and to the logger. To prevent Darca from 'giving up' the connection, with an error like 'the logger could not be woken' you can increase the numbers of times Darca retries to 'wake up' the logger and the number of times it will retry a command to the logger. To do this go to settings then preferences and select the timing tab. Increase the wake up retries to 25 and the command retries to 10. This is particularly important if the logger is also scanning or logging the inputs very frequently.
- Clear the memory while logging is in progress
- Start logging when the memory is full
- Start logging if no channels have been selected
- Perform multiple runs if memory is in continuous mode
- Reset pulse count while logging is in progress
- Change date and time while logging
- Change start date and time while logging
- Change log and sample intervals while logging
It is not possible to change the following either when there are readings stored in memory or when logging is in progress:
- Log mode
- External trigger mode
- Memory mode
- Channel set up and ranges
- Engineering unit ranges
- Memory size
- Language type
- Sensor switch on time
- Date format
- Filter frequency
- Each pulse transmitter contains a counter which counts the pulses from a connected sensor. This counter rolls over when it reaches its maximum value.
- During each logging interval, the logger will receive a number of transmissions of this counter value from each pulse transmitter. These will occur at random times in order to minimise signal clashes.
- When the logger reaches the end of the logging interval, it looks at the last counter value it received from a transmitter. It compares this with the counter value from the previous logging interval and stores the difference of the two values. If the counter has rolled over during the logging interval, it will see the newer value as lower than the previous value and will take this into account when calculcating the value to store.
- The value of measured pulses that the logger stores is therefore never tied to a strict time interval as the time between transmissions is random. Over longer periods of time, however, this fact becomes irrelevant.
A. Microsoft decided not to include the windows help system with Windows Vista or Windows 7 by default. Darca plus and Darca Lite currently use this form of help. You can install the help system via microsoft from the following location(s):
A bug can cause this problem if you attempt to set a local alarm on a transmitter that does not have the alarm hardware option. To cure the problem, use Tx setup to ensure all Hi and Lo alarms are set to 'Not Set'.
|abs(x)||Return absolute value|
|atan2(x, y)||Calculate arctangent with two parameters to preserve quadrant angle|
|bessj(n, v)||Bessel function of the first kind. n is order and v is input value.|
|bessy(n, v)||Bessell function of the second kind. n is order and v is input value.|
|ceil(x)||Find integer ceiling|
|cosh(x)||Calculate hyperbolic cosine|
|exp(x)||Calculate exponential function: ex|
|floor(x)||Calculate integer floor|
|hypot(a,b)||Calculate hypotenuse of right triangle|
|log(x)||Calculate natural logarithm|
|log10(x)||Calculate base-10 logarithm|
|max(x, y)||Return larger of two values|
|min(x, y)||Return smaller of two values|
|rand(x)||Get pseudorandom number between 0 and 1|
|sinh(x)||Calculate hyperbolic sine|
|sqrt(x)||Find square root|
|srand(x)||Initialize pseudorandom series|
|tanh(x)||Calculate hyperbolic tangent|
If you have an FAQ that you would like share with others in this section then please contact us at email@example.com.
After Sales Service
Eltek's extensive After-Sales Service package includes:
1000 Series Squirrel data loggers are guaranteed for three years against faulty materials or workmanship.
The guarantee given for equipment supplied by us, but not manufactured by us (this includes all sensors, whether built into probes or not) is limited to the guarantee given by the manufacturer of the particular product.
If repairs are carried out under guarantee, no charge is made for labour, materials, or return carriage.
Repairs are normally carried out within five working days of arrival at our facility in Cambridge or receipt of authorisation to repair. Spare parts and service manuals can be dispatched within two working days. Distributors of Eltek data loggers outside the UK may hold stocks of spare modules and most have their own service engineers and operate a similarly prompt repair service.
Eltek can provide installation and commissioning services for both data logger and telemetry applications.
Please contact Eltek for a detailed quotation.
Eltek can provide training to end users so that the actual users quickly become familiar with and competent in the use of Squirrel data loggers.
In addition to the use of the data logger itself there will be in-depth and hands-on use of the Darca software including use of the graphing (where applicable), data, setting up, and down loading tools.
Training is normally conducted at the customer's premises and usually takes about 3 hours.
Mileage and travel time is charged for plus 3 man hours at the standard labour rate.
Contact Eltek for a quotation.
This is normally only needed for telemetry systems. Before ordering a telemetry system it is important to identify any areas where radio coverage may not be good so that the system can be designed to work round them. The survey is conducted using radio, operating in the frequency band that the customer can actually use. This will reveal any need for devices such as repeaters or external antenna, making sure that the system supplied is appropriate for the site before installation.
Generally a half day to one day is required, dependent upon the size of the installation envisaged.
Mileage and travel time is charged for plus the number of man hours for the actual survey work plus one man hour for report preparation at the standard labour rate. A report is provided with findings, recommendations and alternatives if necessary.
Certificate of Conformity
A Certificate of Conformity (COC) is issued with every Eltek Squirrel data logger, or telemetry component to confirm that it has passed all the functional safety tests which check that it meets its specification, including the calibration process described below.
Every Squirrel is subject to a calibration procedure and heat soak test to ensure the stability and accuracy of the readings with changes in ambient temperature. The input values are provided by equipment with calibrations traceable to national standards.
Eltek can carry out an even more stringent calibration procedure and issue a calibration certificate at extra cost. The Squirrel is subjected to a second calibration in a temperature-controlled calibration laboratory. Each range is checked at five points, using equipment with calibrations traceable to national standard and a record is made of the results.
Eltek can also quote for full NAMAS certification. This certification, similar to the stringent calibration noted above, is carried out by an independent calibration laboratory certified by the British National Measurement Accreditation Service (NAMAS). This certification process can include extra calibrations or tests if requested on the logger alone or together with sensors.
Please contact Eltek to discuss your requirement so that a detailed quotation can be prepared for you.