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Installation
Figure 3-4 RS485 Daisychain Wiring: Controller in the Middle
How to Set the RS485 Control Data Termination
1. Locate SW1 on the housing interface board.
2. Carefully place the switch in the required termination position:
• (Default) To keep the setting as not terminated, place switch away from ON.
• To terminate in 120 Ohm, place switch ON.
Selecting Video Over Coaxial Cable or Unshielded Twisted Pair (SW2)
Control Over Coaxial Cable
Caution For control over coaxial cable, the dome must be set to VCL video
telemetry (control over coax) protocol and must be controlled using an
HMAX082 or HMAX162 control unit and HKJMMTP joystick controller.
The control equipment adds the data signal to the video coaxial cable. In this case, there
are no connections made at data+ and data– on the terminal strip J1.
Video Over Coaxial Cable: Coax Video Enabled
The video must be terminated in 75 Ohm at the last video device. If the video is not
terminated or is double terminated, the resulting picture is poor and ghosting is
displayed.
Last dome
Terminated
Dome 1
Terminated
Dome 2
Not terminated
Domes 3 to 31
Not terminated
Control equipment
SW1 OFF
SW1 ON
SW1 ON
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