API Documentation
Everything you need to interact with AccessGrid via API.
PointGaurd MDI 37bit
Everything you need to understand PointGaurd MDI 37bit
Card format overview
A proprietary 37-bit card format used in access control systems, featuring a unique structure composed of 4-bit site code and 29-bit card number, and 2 parity bits (even and odd), allowing for easy management and avoiding card number duplication for secure, contactless access.
PointGaurd MDI 37bit format properties
4 bits. The facility code range is 0 to 15.
29 bits. A unique serial number (0-536,870,911) for each card within that facility code.
Even Parity for Even parity over bits 1-18.
Odd Parity for Odd parity over bits 18-36.
Generate examples
Put in the values for this card format, we'll generate the results in a few different formats.