PTI Security Systems specifications for Digitech RS-485 systems

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  1. The RS-485 network will be a continuous circuit, with no branches. Only two ends are permitted.
  2. Each end of the circuit will be terminated with the appropriate jumper or switch setting (depending on what type of device is at the end).
  3. The specified cable is used for connecting the devices, and that the shield wire is connected at both ends to connector P2. At the Syscon end the shield wire is connected to a valid earth ground. Do not connect the shield wire to earth ground at any location other than the Syscon.