General
Material	Aluminium
Number of keys	16
Illumination	White
Colour	Silver
Product type	Function module
Compatibility	Door intercom station Series 20

The function module 20-2501A from Telecom Behnke is a keypad module for door intercom systems of series 20. It serves as an expansion module for existing installations and enables the integration of code lock and telephone functions in conjunction with the base electronics. The module is housed in a robust aluminium housing, offering high mechanical stability and resistance to environmental influences. Dimensions are 90 mm in height and 90 mm in width, allowing integration into standard mounting openings.

Applications
This module is designed for use in industrial and commercial installations where secure and reliable access control is required. It is used in door intercom systems featuring electronic access control and enables selection of up to 16 different functions or destination addresses. The illumination of the keys ensures good visibility even in poor lighting conditions, which is particularly beneficial in halls, production areas, or during night operations.

Functions and Equipment in Detail
The keypad module features 16 keys, each assignable to a specific function or internal connection. The keys are white illuminated, ensuring clear visibility. Functions include control of a code lock and initiation of telephone connections, with exact key assignments configured via the base electronics of the door intercom. The module is not autonomous and requires connection to a compatible base electronics unit to perform its functions.

Technology Explained Simply
The module acts as an interface between the user and the electronic control of the door intercom. The keys serve as input devices, with each key closing an electrical contact that is detected and processed by the base electronics. Key illumination is provided by an integrated light source, activated during operation. The aluminium housing offers high protection against mechanical damage and corrosive influences, extending the module’s service life.

Compatibility and Accessories
The module is specifically developed for door intercom systems of series 20 from Telecom Behnke and requires use with a compatible base electronics unit. It is not intended for other systems or manufacturers. Integration is achieved via standardised connections provided in the base electronics.

Mounting and Installation
Mounting is performed into a pre-fabricated opening of 90 mm height and 90 mm width. The module is inserted into the opening and connected to the base electronics. Electrical connection is made via the terminals of the base electronics, matching the specific terminal assignment of the base electronics. No additional tools or mounting aids are required, as the module mechanically fits into the designated opening.

Operational Advantages
The module provides clear and user-friendly operation via the 16 illuminated keys. Integration into existing door intercom systems of series 20 requires no additional hardware, minimising system complexity. The use of aluminium ensures high mechanical stability and durability, particularly advantageous in industrial environments. Key illumination enhances usability in dark or poorly lit areas.

The delivery includes the module keypad block 20-2501A in aluminium version with 16 illuminated keys.