Axis Communications 2460 - Manual (Page 67)

AXIS 2460 User’s Manual Unit Connectors 67
The AXIS 2460 then displays the status of the inputs, as follows:
The BNC Video Inputs
4 BNC composite video inputs with 75 Ohm/Hi Z termination. Autosensing for NTSC and
PAL. Each video input is terminated using a coax/BNC connector. Physical connections are
made using RG59, 75 Ohm coax video cable. The recommended maximum cable length is
800 feet (250 meters).
The BNC Video Outputs
4 BNC video outputs that can be used for connecting the AXIS 2460 to a traditional analog
CCTV system or to a VCR. This output can be used independently of the Ethernet network
connector and both can be used at the same time. The video output signals are connected
directly to the video input signals (loopthroughs).
The Ethernet Network Connector
The RJ-45 network connector is used to connect the AXIS 2460 to a 10/100Mbit Ethernet
network running TCP/IP.
About RS-485
RS-485 is a standard for transmitting data over multi-drop communications line.
Supporting up to 32 drivers and 32 receivers over a single twisted pair cable, the maximum
cable length should not exceed 1220 meters (4000 feet). Typically used for connecting a
single master (e.g. a PC) to several addressable devices over the same cable. The master
decides which slave speaks and the slaves only speak when spoken to, by raising RTS.
The AXIS 2460 will act as either a master or a slave, depending on how communication is
initiated. RS-485 is similar to RS-232, but without a signal ground. Data detection is by
measuring the voltage difference between the positive and negative line. This eliminates
disturbance by interference, because interference appears identically on both lines
simultanously. This means greater distances can be covered than with RS-232.
Input 1 = 0
Input 2 = 1
Input 3 = 0
Input 4 = 0