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9

DS-DMX250 R 0.80

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It is the system designer's responsibility to check the local regulations for high voltage coupling.

Figure 8 – Possible high voltage interface

2.5.9

Recommended connection to power-supply

Power-supplies usually require big filtering capacitors that may attenuate strongly the DMX250 carrier signal. It is

recommended to add an inductor (>22uH) or ferrite bead (>100Ω @ 5MHz-30MHz) in series to the power supply

connection to the DC powerline to avoid carrier signal attenuation.

Figure 9 depicts a typical DMX250 connection to a DC powerline and its power-supply.

Figure 9 – DMX250 connection to 3.3V power-supply and powerline

3.

DMX250 operation

3.1

Interfacing with DMX/RDM Controller

The DMX communication protocol uses four pins as described in Table 6.

Table 6- DMX/RDM interface pins

HDI

Data Input from the DMX-controller.

HDC

Data/Command select input.

When pulled down, the DMX250 enters command mode,

enabling access to DMX250 Control registers.

HDO

Data output to the DMX-controller

Figure 10 depicts a typical DMX250 to DMX/RDM controller interface connection.