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You have secific questions concerning our display units? Maybe you will find an answer at our FAQ’s:

FAQ’s - Frequently Asked Questions about Large-Display-Units with RS232-Interface

Why does the display unit show nothing or only undefined characters on its digits right after initialisation?

This is no error, but the normal situation after first setting the unit to operation. As soon as the display gets the first data from the Sunny Boy Control, it will show values that make sense.

Why does the display unit show nothing or only undefined characters on its digits even after a longer period right after initialisation?

The display unit does not receive any data on its interface.

• Check if the data cable between large display unit and Sunny Boy Control is connected in the right way.
• Check wether the Sunny Boy Control is set on display-mode for the HvG displays and not for another type (please see Sunny Boy Control manual for this). If it has been configured in the right way before, please do it again, because sometimes the values do not get saved.

Despite a correct installation of all components and right configuration of the Sunny Boy Control, the display unit shows nothing or only undefined characters on its digits.

Download the test software DiTest to test the communication between display unit and Sunny Boy Control. With this software you can simulate the Sunny Boy Control with a PC or laptop computer. You can then make sure, that everything is o.k. with the datacable between these two devices.

After start of the file DiTest.exe please set  the COM-Interface according to your PC-configuration. Set the baud-rate to 2400 and activate the interface by checking the according checkbox. If you want to change the data that gets sent to the display please always start the data string with #.

How can I test if data arrives at the display input at all?
The Display seems to show no sensible values despite a correct installation and configuration of the datalogger. This status can have different causes: Either the data is not arriving the display because the cabling is wrong or disconnected or the datalogger doesn’t send anything at all because it is broken or wrongly configured.
To check this you can either make a qualitative test with a multimeter or use a computer /laptop to send data to the display by hand.

The checking by computer / laptop at first seems only to be available for displays with RS232 interface, because the computer usually only has such an interface and not an extra RS485 as well. Nervertheless there is also a possibility to check a display with RS485 input with a computer with RS232 output.To do this, please take a look at the table below, which shows how the cabling has to be done between computer and display unit.

To check Displays with RS232-Input please do the following:
Connect the datacable to the datalogger and the display unit. Also connect a multimeter with - (COM) to the display input Gnd and with + (V) to the display input RxD. Now you should read about 11V on your multimeter. This 11V will be interrupted about every 7 seconds and fall to 8V for a short time. This is the moment when the data is sent from the datalogger. So if you find the 11V but not the 8V interruptions, it will mean, that the datalogger doesn’t send any data. If you even don’t measure the 11V, but 0V instead, you may have a faulty datacable. If everything is correct with the measurement, please try to exchange the two wires of the datacable with each other. If this doesn’t lead to a positive result, then there must be some other fault in the system.

To check Displays with RS485-Input please do the following:
Connect the datacable to the datalogger and the display unit. Also connect a multimeter with - (COM) to the display input Data - and with + (V) to the display input Data +. Now you should read about 5V on your multimeter. This 5V will be interrupted about every 7 seconds and fall to 0 to1V for a short time. This is the moment when the data is sent from the datalogger. So if you find the 5V but not the 0 to 1V interruptions, it will mean, that the datalogger doesn’t send any data. If you even don’t measure the 5V, but 0V instead, you may have a faulty datacable. If everything is correct with the measurement, please try to exchange the two wires of the datacable with each other. If this doesn’t lead to a positive result, then there must be some other fault in the system.

With a Laptop / PC and the Testprogram DiTest you can check the communication to the display as follows:
Download the Testprogram
DiTest . It consists only of a small exe-file which will run without installation.

  • Doubble-click on the file DiTest.exe. Go to the menue Schnittstelle and set the following parameters:
  • Baudrate: 2400 Baud
  • Schnittstelle: COM-Schnittstelle 1 or 2, depending on which one you use on your computer.
  • Click on Aktivieren so that it gets checked.
  • Click on Zurück.

Now you can transmit data to the display.
To do so, disconnect the cable from the datalogger and plug it into the COM-interface of your computer.

Please note the following cabling instructions:

Display with RS232-Input (normal cabling, no change neccessary)

Sub-D-Connector on Laptop / datalogger

Input terminal of the Display

Pin 3

RxD

Pin 5

Gnd

 

 

 

Display with RS485-Input (different cabling for test purposes)

Sub-D-Connector on Laptop / datalogger

Input terminal of the Display

Pin 3

Data -

Pin 5

Data +

 

 

Please click on Übertragen . If nothing changes on the display-unit please click again. Now the diplay-elements should show the according values of the transmitted data-string. You can now change the values of the data-string and transmit it again by clicking onto Übertragen. Please note, that the string must begin with #.

If the large-display-unit should show no sensible data on its display elements despite clicking on Übertragen for a few times, the data cable is most properly not connected in the right way. Please check the connection of the cable according to the installation manual.

If the data is shown correctly on the display-unit during this test, but only now and not when the datalogger is normally connected to the display-unit, this is an indication for the fact, that the datalogger may be programmed in the wrong way or is even broken. Please refer to manual of the datalogger in this case. The configuration of the dataloger Sunny Boy Control can also be looked up in the installation manual of the large-display-unit and in the following section of this manual.

 

Why do the displayed valus on the digits of the unit not change (during daylight hours and with the sun shining bright)? They seem to be stuck at a certain value.

The large display unit does not receive data anymore from the Sunny Boy Control. The data received the last will be displayed on the digits until a new data words is received.

• Check the data cable for any damages or loose contacts.
• Check the Sunny Boy Control. Maybe it does not receive data from the Sunny Boys anymore. In this case the values on the little LCD of the Sunny Boy Control wouldn’t change either. Please see the manual of the Sunny Boy Control for this error.
• Check the interface configuration of the Sunny Boy Control

 

FAQ’s - Frequently Asked Questions about Large-Display-Units with pulse-input (S0-Interface):

Why does the display unit show nothing or only undefined characters on its digits right after initialisation?

This is no error, but the normal situation after first setting the unit to operation. As soon as the display gets the first impulse from the electricity counter, it will show values that make sense.

Why does the display unit show nothing or only undefined characters on its digits even after a longer period right after initialisation?

The display unit does not receive any data on its interface.

• Check if the data cable between large display unit and electricity counter is connected in the right way.
• Check if the electricity counter is connected in the right way when it comes to phase and neutral. If those two get mixed up, the counter will most probably not work correctly.
• Press the RESET button of the display unit. The button can be found on the backside of the module which shows POWER (PAC) underneath the first digit.

 

For any further questions please contact us directly or referr to the German version of our FAQs.