SBC-D23
SBC-D23 User Manual - Rev. First Edition: 1.0 - Last Edition: 1.0 - Author: S.B. - Reviewed by P.Z. - Copyright © 2021 SECO S.p.A.
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3.3.13
Serial Ports Connectors
The PX30 Processor supports up to six UART Interfaces. Four of them are used on SBC-D23 board.
UART Port #0 is made available, through a dedicated RS-232 transceiver on a dedicated Micro-fit 2x4
connector type Molex 43045-0812 or equivalent, with the pinout shown in the table on the left.
Mating connector: MOLEX 43025-0800 or equivalent with 43030 female crimp terminal.
RS232_A_TX: COM Port #0 RS-232 Mode Transmit data
RS232_A_RX: COM Port #0 RS-232 Mode Receive data
RS232_A_CTS: COM Port #0 RS-232 Mode Request to Send handshaking signal.
RS232_A_RTS: COM Port #0 RS-232 Mode Request to Send handshaking signal.
On Connector CN43, instead, it is available the UART Port #4, which can be available with
RS-232 or TTL interface (factory options).
For this purpose, a dedicated 5-pin connector, Type MOLEX p/n 53398-0571 or
equivalent is provided. Mating connector: MOLEX 51021-0500 receptacle with MOLEX
50079-8000 female crimp terminals.
UART Port #4 is managed as a factory alternative to microSD Slot, i.e. boards having this
port available (either in RS-232 or in UART TTL mode) will not have the microSD slot mounted.
RS232_B_TX: COM Port #4 RS-232 Mode Transmit data
RS232_B_RX: COM Port # RS-232 Mode Receive data
RS232_B_CTS: COM Port #4 RS-232 Mode Request to Send handshaking signal.
RS232_B_RTS: COM Port #4 RS-232 Mode Request to Send handshaking signal.
The connector CN27, instead carries out signals related to UART #2 interface from PX30
processor. This interface can be used for the debugging of the processor.
The connector is type MOLEX p/n 53398-0471 or equivalent. Mating connector: MOLEX 51021-
0400 receptacle with MOLEX 50079-8000 female crimp terminals.
DUART_TX: UART port #2 Transmit signal, +3P3V_SW electrical level
DUART_RX: UART port #2 Receive signal, +3P3V_SW electrical level
RS-232 Port #A Connector CN42
Pin
Signal
Pin
Signal
1
RS232_A_CTS
5
RS232_A_TXD
2
RS232_A_RTS
6
RS232_A_RXD
3
V
IN
7
GND
4
+5V_STBY
8
GND
RS-232 / UART Port #B Connector CN43
Pin
Signal
1
RS232_B_TX
2
RS232_B_RX
3
RS232_B_RTS
4
RS232_B_CTS
5
GND
Debug UART Connector CN27
Pin Signal
1
+3P3V_SW
2
DUART_RX
3
DUART_TX
4
GND
