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EV-K0-HCD Evaluation Kit User's Manual
They can be used to drive up to four off-the-shelf LED light engines, for example, the POWERWHITE™
linear light engine modules from Dialight. Before installing the modules, you must first remove the
jumper wires inserted at the four Tyco receptacle connectors (J1, J2, J3 and J4).
There are six LUXEON Rebel high-power LEDs in series in one POWERWHITE light engine module.
Therefore the power supply must be 24 V
The analog inputs (pin 1 & 2) on the connectors are mainly for connecting to off-board thermister on
the light engine module but can be used for any analog inputs, such as potentiometer, light sensors,
etc. Please not that each analog input is biased with a 10kohm resistor (refer to R11, R12, R13 and
R14).
2.6
RS-485/DMX-512 Interface
The EV-K0-HCD board supports DMX-512 protocol over RS-485 using the MCU's UART0 port. The
RS-485/DMX-512 connector is a 3-pin terminal block connector that accepts up to 24 American Wire
Gauge (AWG) wires.
Pin Number
Function
The µPD78F8024 MCU's UART0 port is shared between the RS-485 and RS-232 connectors through
a Maxim level shifter (refer to U7 in the schematics). By default, the RS-485 connector is enabled and
the RS-232 one is disabled.
If required, an on-board 110Ω resistor can be inserted between D+ and D- of the RS-485/DMX-512
port as a terminating resistor. By default, the resistor is disconnected. To connect it, insert a jumper
into the JMP1 header (refer to JMP1 in the schematics).
Figure 3. Driving the Dialight Light Engines
RS-
485/DMX-512 Connectors
Table 2
.
1
Ground
to meet the requirement specified by Formula 2.
DC
2
D-
6
3
D+
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