Pairing of a User Interface Unit with a Meter

A user interface unit (UIU) is a remote access terminal for STS prepayment meters. The device is placed inside the user's premises, while the energy meter is mounted outside and mostly not direct accessible. Some meter manufacturers are using the term customer interface unit (CIU). The functions are the same.

The main purpose is to charge the meter with credit. By various short-codes, it's possible to do many kinds of queries for meter status and consumption. The short codes are not unified, so refer to your user manual for operation.

UIUs are paired with the energy meter when leaving our factory. Depending on the utility order, CLOU interface units are communicating with the meter by radio frequency (RF), power line (PLC) or by wired RS-485.

User Interface Unit

If the UIU is not communicating with the energy meter, you can pair it again by typing 1593570 and the 11 or 13 digit meter number, then press the enter key (red or blue). The meter number is printed on the meter and on your customer card, which you use to buy credit.
After successful pairing, the display will show OK.
Note: This is only working for CLOU energy meters.

There can also be other reasons for a communication fail. If the UIU is connected by power line and you are disconnected, batteries need to be inserted in the UIU to recharge the meter or query the status. If this meter is in tamper mode, a recharge is impossible before clearing the tamper.

Editor's note: This article was originally published in August 2020 and has been updated for comprehensiveness.

217 Replies to “Pairing of a User Interface Unit with a Meter”
  1. Just got a prepaid metre but the activation code is not working I called and another code was sent after entering the code is still displaying the same error REJECTED

    1. The "REJECTED" message typically means that the token wasn't issued for your specific meter number. Please double-check that the meter number you used to generate the token matches the number on your meter. If the numbers match and the issue persists, it might be helpful to contact your service provider again.

  2. I had a tenant I think did illegal and new tenant can't purchase do I solve this

    1. Thank you for reaching out with your concern. It sounds like you're facing a situation where a previous tenant may have engaged in illegal activities, and the new tenant is unable to purchase prepaid energy. In this case, it would be best to contact your energy service provider directly.

      Your energy service provider has the expertise and authority to handle such matters. They will be able to investigate the situation, provide guidance, and take appropriate action to resolve the issue. They may have specific procedures in place to address these types of situations and ensure that the new tenant can access the energy services they require.

  3. My uiu is showing rejected when I type in the 20 digits codes. What can I do to link it to my meter

    1. The "Reject" message typically indicates that the token you're entering either has been entered incorrectly or isn't issued for your specific meter. To resolve this, we recommend the following steps:
      – Verify the token: Double-check the 20-digit code you're entering to ensure its accuracy. Make sure there are no typos. It's important to be precise when entering the token.
      – Contact your service provider: Reach out to your utility or service provider and explain the issue you're facing. They can verify whether the token you have is correct and compatible with your meter.

  4. hi, where can i get my uiu 11 digit meter number, because there are more than 11 digits on the card i was given.

    1. Newer meters might have already a 13 digit meter number. The standard has recently changed. The UIU pairing sequence is the same.

  5. Hello I'm an electrician,could you assist me with error codes i.e 1-9 with there corresponding meaning

    1. First of all, you need to initialize the UIU. Below is the process:
      Step1: Input '1593570' + 999′ + Enter' to initialize the UIU
      Step2: Input '1593570' + “11-digit meter number' + Enter to pair the meter with UIU.
      Step3: Input '999' + enter' to check the paired meter, and 12-digit address' will be displayed on the UIU

  6. I had this tenant and left with the ciu… Is there a way i can load tokens using another ciu

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