DS-K2604T(main board)

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main board Dimensions： 236 mm × 185 mm × 37 mm (9.3" × 7.3" × 1.5") Four-door Access Controller, Storage with 100,000 cards and 300,000 access control events. Uplink Communication: TCP/IP、ISUP5.0 and RS-485; ISAPI、OSDP Accessible Card Reader: 4 Wiegand readers or 8 RS485 readers; Input interface: 4 alarm input, Door Sensor×4, Door Switch×4, Case Input×8, Fire Alarm Linkage×1, Tamper-proof×1; Output interface: Door Switch Relay×4, Alarm Relay×4.

main board
Dimensions： 236 mm × 185 mm × 37 mm (9.3" × 7.3" ×
1.5")
Four-door Access Controller, Storage with 100,000 cards and
300,000 access control events.
Uplink Communication: TCP/IP、ISUP5.0  and RS-485;
ISAPI、OSDP
Accessible Card Reader: 4 Wiegand readers or 8 RS485
readers; 
Input interface: 4 alarm input, Door Sensor×4, Door
Switch×4, Case Input×8, Fire Alarm Linkage×1,
Tamper-proof×1;
Output interface: Door Switch Relay×4, Alarm Relay×4.