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 users premisses 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 RS485.

User Interface Unit

If the UIU is not communicating with the meter you can pair it again by typing 1593570 and the 11 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 be also 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.

36 Replies to “Pairing of a User Interface Unit with a Meter”

  1. How will I know meter number connected to my uic since I have 2 uiu I’m unable to differentiate kindly assist me

    1. You have two UIUs, that’s cool. You can check the meter number with a short code 65. Alternative is that you pair one UIU with your meter by following the instructions in the article above.

  2. Sir
    We have plug in service cables to customers (8x from one box)
    What will happen if one plug is disconnected while meter is serviced and replaced with another service cable

    1. I’m not clear about your term “plug in service cable”. If you mean the UIU connection cable, nothing will happen. If the cable is part of a distribution box to connect the mains power to the meter it depends on the actual meter load. Imagine, the meter is running on 60 A. In that case you will produce a heavy spark between plug and socket during disconnection. This leads eventually to damage on plug and/or socket and it’s hazarding for life! The best praxis is to disconnect the breaker on the primary side of the distribution box. Then all 8 plugs are de-energized. If this is not possible, you can disconnect the single customer during changing of the cable by tripping the customers main circuit breaker. If you are unsure, call an electrician. Stay safe!

    1. Warning indicates an abnormal status. If you see an additional raised hand on the display, the meter is in tamper mode. If not, check for a text message on the display. Or maybe the meter is just run out of credit.

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