User`s manual

Multiple Dome means that more than one NDC is linked in the system. Each dome connects to next dome forming a
serial linking. Each dome has an individual ID dip switch, which allows the keyboard to identify each NDC and make
command. Sometimes it is more convenient to wire a telemetry system in star configuration rather than daisy chain. To
do this a PIH-804 data distributor is necessary. It takes an output from a keyboard or a matrix and splits the single data
line into 4 separate data lines. One keyboard can control up to 64 cameras.
RS-485 Connection Between PIH-804 Data Distributor and NDC
z 1st output TXDI1+ of PIH-804 connects to TXDI+ of 1st NDC and TXDI1- of PIH-804 to TXDI-of the NDC.
z Linking 2nd NDC : TXDO+ of 1st NDC connects to TXDI+ of 2nd dome and TXDO-of 1st dome to TXDI- of 2nd
dome.
RS-485 Connection Between PIH-804 Data Distributor and Keyboard
z 1st pin TXDI+ on RS-485 IN jack of keyboard connects to TXDO+ on RS-485 OUT jack of PIH-804
z 2nd pin TXDI-on RS-485 IN jack of keyboard connects to TXDO-on RS-485 OUT jack of PIH-804
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