Rs-485/Dmx-512 Interface; Rs-232 Interface; Expansion Io Connector; Table 2: Rs-485/Dmx-512 Connectors - NEC 78K0 User Manual

78K0 - Shine It!

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.
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).

2.7 RS-232 Interface

A DB9 male connector is used for the RS-232 interface. By default, RS-232 function is disabled. To
enable it, place DIP switch (refer to SW1 in the schematics) position 4 in the "ON" position.

2.8 Expansion IO Connector

A dual-row 10-pin header footprint in 2mm-pitch is available on the EV-K0-HCD board (refer to CN3 in
the schematics), the uPD78F8024 device's UART0/CSI and I2C signals are pulled out on this connector.
The following table shows the pin out connections.
Pin Number
1
2
3
4
5
6
7
8
9
10
The expansion IO connector pin outs are compatible with the NEC Electronics ZigBee sticks interface;
users can add ZigBee / 802.15.4 wireless capability to LED lighting applications.
Pin Number Function
1 Ground
2 D-
3 D+

Table 2: RS-485/DMX-512 Connectors

Pin Number Function
2 TX
3 RX
5 Ground
1,4,6,7,8,9 Not connected

Table 3: RS-232 Connector

Pin Name Description
GND Ground
VDD Logic power supply
RX/SI UART0 RX signal / CSI data input signal
TX/SCK UART0 TX signal / CSI clock signal
SO CSI data output signal
IO P0.0 / Timer TM00 capture input
SCL I²C clock signal
SDA I²C data signal
GND Ground
VDD Analog voltage reference

Table 4: Expansion IO Connector

User's Manual U19610EE3V0UM00
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