4 DOOR ACCESS CONTROL EXPANDER MD-D04B

The expansion board adds an additional four reader or keypad inputs, four relay outputs and four supervised inputs to the access control panel.
As a result, an access control panel with an MD-D04B expansion can support a total of eight readers and eight door panels.
In addition, it is possible to add any keypad or biometric reader that supports the Wiegand or Clock & Data transmission formats.