Brivo ACS6100 Series Door Board – Two Reader Expansion Board with OSDP (Board Only)Brivo ACS6100 Series Door Board 2 Reader Expansion with OSDP (Board Only) Expand your Brivo ACS6000 ACS6100 access control system with the ACS6100 Series Door Board. This two reader expansion module connects over CAN bus and adds two additional controlled doors to your existing controller. With native OSDP support, it enables encrypted reader communications and modern device compatibility. Key Features Adds two (2) doors to ACS6000 ACS6100 main