The IXP20 Controller, constructed on either an Impro iTT or iTRT Door Controller platform, facilitates the direct linking of 2 Readers to the Controller. This system offers expandability, supporting up to 4 Doors in Anti-passback (APB) Mode or 8 Doors without APB. Additionally, the IXP20 system can be enhanced through firmware modifications, allowing its integration into more extensive IXP systems.