Connecting the ACM08E keypad to the C-WG-0503S module

The access control via a keypad with a proximity reader of cards or similar identifiers can utilize the ACM08E sensor with a keypad connected to the C-WG-0503S module. The sensor is equipped with a numeric contact keypad and a proximity card reader in accordance with the EM 125kHz standard.

The C-WG-0503S module provides Wiegand communication with the sensor and control of LEDs and the buzzer. The module is equipped with a green, red and yellow LED. The green LED shines permanently (it is not controlled), the red shines in an idle position, and after the card is scanned, the red light is for a moment replaced by a yellow light and the buzzer beeps. When the LED external input is activated, the red LED also goes off and the yellow LED lights up. The precise LED control status should always be checked on each particular piece (the LED manufacturer has made some colour changes).

Tab. 1. A description of interconnection of the ACM08E sensor outputs and the C-WG-0503S module outputs.

Notes:

1. The table shows the interconnection of wiring of both modules. N.B.: In the ACM08E module it is necessary to verify, whether the colours of signals in the legend on the rear side of the keypad module correspond with this table, as the manufacturer has made some changes to the colour marking and different colours of the wires therefore cannot be ruled out).

2. The cable for connecting the keypad can be extended to dozens of meters (the manufacturer allows the length up to 150 m); the communication and control require a shielded cable with the minimum cross section of 0.35 mm² , and the power supply only requires an unshielded cable with a recommended cross section of 0.75 mm².

3. The indicated consumption of the ACM08E sensor from the supply voltage is 70 mA, which still allows the use of the 12 VDC power supply output of the C-WG-0503S module (a maximum consumption from the 12 V output is normally 60 mA).

4. The free inputs AI/DI4 and AI/DI5 can be utilized e.g. for connecting the temperature sensors (measuring the temperature in the room, etc.).

The properties and parameters of the ACM08E sensor

The ACM08E sensor is designed for contact-free (RFID) reading of identifiers of the EM 125 kHz type as a standard, and for entering PIN codes via a touch keypad.

The sensor is equipped with a red, yellow and green LED indicators and a buzzer.

The sensor is designed for indoor and sheltered outdoor installation (the manufacturer does not specify the level of protection) with a contact keypad; the internal electronics is embedded for maximum durability.

The sensor is mounted on the wall with two screws (approx. M3, or 3.5 mm wood screws); the layout of the mounting holes is indicated in Fig. 3.; in the middle between the mounting holes in the rear wall there is a fixed connecting cable.

The cable is terminated with free coloured wires, see Tab. 2.

Tab. 2. The basic parameters of the ACM08E sensor

Fig. 2. The front view and the drawing of the ACM08E sensor mounting