The user interface unit (UIU) is a device for remote access to STS payment meters.
If meters are mounted in a box or on a pole they can not be accessed for token input. In this case a UIU is necessary for STS operations.
Beside of token transmission the UIU provides various information about meter status and consumption.
Depending on the meter vendor a UIU is also named as CIU (customer interface unit). The basic functions are the same.
|Model||The model type follows the meter type. It’s indicated above the display.|
|Mains power supply||220 V to 240 V|
|Backup power supply||4 x 1.5 V AAA battery|
|Communication interface||RS-485, wired connection/radio frequency (RF)/power line communication (G3 PLC), the interface is depending on the order|
|Ingress protection||IP 51|
|Operating temperature||-25 °C to +70 °C|
|LCD display||LCD size: 57 mm x 23 mm|
Digit size: 10 mm x 5 mm
Backlight on activation
|Dimensions||144 mm x 80 mm x 42 mm|
|Mounting||wall mounted, with fixing cradle|
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Editor's note: This article was originally published in March 2020 and has been updated for comprehensiveness.