125 kHz Proximity technology

For most card formats, your card range is numbers between zero and 65,535.

The card’s sequence or range number is programmed into it along with the facility code. The combination of both numbers are what tells a card reader which cards have access to the building – both the facility code and sequence number must match for the card to work. Because of this, it is incredibly important that cards do not have the same sequence number; because they have the same facility code and sequence number, the system cannot tell the cards apart. When you order new cards, order the cards in the next range of numbers.

For example, if your current box of cards ends with sequence number 120, your next cards should start with sequence number 121.

If your organization needs a large number of cards, you have several options.

First, you can set up your system to use more than once facility code. This would require card readers than are compatible with more than one facility code. Using this method, you could have the full range of zero to 65,535 under each facility code. The cards would not be identical because their facility code AND sequence numbers do not match.

Second, you can register your cards with other bit-pattens such as 35-bit or 37-bit HUGE (no facility code). These formats allow you a greater range of card numbers, up to 34,359,738,367. 

We will need to know the format (bit-pattern), facility code and starting number. You can often find this information on the box from a previous order. If not, please request that the information is provided for every order. Tracking you numbering sequence if critical to avoid duplicate numbers.

No. The low frequency technology operates at a carrier frequency of 125 kHz. NFC operates at 13.56 MHz. Consequently, it's impossible to read proximity cards with an NFC reader (and vice versa).