GDS3710 as a Wiegand Output - Keypad



I am using GDS3710 as a keypad for another access control.
I can get 4 digits long pin only. I would like to get longer pins.
I have been told by the assistance of the access control system that the problem may be that GDS3710 sends 4-bits burst for keypad. Do you agree? Is there a mean to increase the number of a pin’s digits? May I have for instance a 8-digits burst for pins on keypad?