FEATURE
-This controller is used to operate pan / tilt / zoom dome cameras and speed dome cameras
-This is able to control the maximum of 255 cameras and lot of sub-keyboards
-It is also controlled CCTV Receivers, Matrix Systems, Alarm Receiver and other controlled Equipments
-Dome Camera can set and fulfill the surveillance function as preset, swing, group(it means tour), tour(it means auto-tour) and etc with the keyboard controller
-Control up to maximum 255 cameras
-Several keyboard can be used to simultaneous control of a camera
-Easy operation of pan/tilt/zoom with a joystick
-Same effect as 64 fixed surveillance cameras by setting the maximum 64 preset positions
-Pan/Tilt swing function (it means auto pan surveillance)
-Group function (it means tour surveillance)
-Tour function (it means auto-tour surveillance)
-PTZ trace function (it means pattern surveillance)
-OSD (On Screen Display) function
-Spiral surveillance function
-Easy setup mode by LCD (Liquid Crystal Diode) module
SPECIFICATION
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MODEL
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MDK 255
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Input / Output Terminal Modular
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Jack
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Interface Between Junction Box
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TTL
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Working Temperature
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0°C ~ +40°C
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Storage Temperature
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-5°C ~ +55°C
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Working Humidity
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Less than 75%RH
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Storage Humidity
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Less than 95%RH
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Dimension
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338(L)x180(W)x84(H)mm
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Weight
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1.2Kg
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MODEL
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JUNCTION BOX
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Power Supply
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9VDC, 500mA power supply
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Input / Output Terminal
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Modular Jack
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Control I/F Between Camera And Keyboard
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RS-485/RS-422
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Working Temperature
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0°C ~ +40°C
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Storage Temperature
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-5°C ~ +55°C
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Working Humidity
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Less than 75%RH
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Storage Humidity
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Less than 95%RH
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Dimension
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109(L)x66(W)x27(H)mm
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Weight Approx
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0.3Kg
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CAMERA CONTROL INTERFACE
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Synchronization System & DATA Length
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Asynchronous Serial Interface
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1 Start bit
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8 Data bit
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No parity
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1 Stop bit
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11 Byte command
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Signal Polarity
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Mark logic "1"
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Space logic "0"
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Transmit System
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Half duplex
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Communication Speed
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2400, 4800, 9600bps
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Protocol
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D-MAX, Pelco-P, Pelco-D
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Hardware
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3 Cable (twist pair)
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CONSTITUTION OF JUNCTION BOX
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Camera Control 1
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Camera ↔Junction box ↔Sub key
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RS-485+
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Camera data +
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RS-485-
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Camera data -
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RS-422+
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RS-422-
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GND
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Camera Control 2
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RS-485+
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Camera data +
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RS-485-
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Camera data -
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RS-422+
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RS-422-
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GND
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Sub Keyboard
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RS-485+
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RS-485+
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RS-485-
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RS-485-
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RS-422 in+
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RS-422 in+
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RS-422 in-
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RS-422 in-
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GND
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SK RTS
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RX RTS
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GND
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RJ9 PIN:
1 = RX-TXD
2 = B+9V
3 = RX-RXD
4 = RX-RTS
5 = GND
6 = SK-TXD
7 = SK-RTS
8 = SK-RXD
●Camera control 1 and 2 compose each separate driver circuit internally
+ Controller PTZ 
