SBC-C20
SBC-C20 User Manual - Rev. First Edition: 1.0 - Last Edition: 1.0 - Author: A.R. - Reviewed by C.M. -Copyright © 2020 SECO S.p.A.
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RS-232 Connector
SBC-C20 offers an RS-232 interface with flow control (CTS and RTS
signals) on dedicated connector CN44. This interface is managed by
i.MX8M internal UART4 Controller.
CN44 is a dual row 10-pin 2mm p connector, type MOLEX p/n 501645-
1020 or equivalent.
Mating connector MOLEX 501646-1000 receptacle with MOLEX 501647,
501648 or 503096 series female crimp terminals.
Pin configuration is described on the table here.
RS232_Rx : COM PORT #4 RS-232 Receive data
RS232_Tx : COM PORT #4 RS-232 Transmit data
RS232_RTS : COM PORT #4 RS-232 Request to Send handshaking signal.
RS232_CTS : COM PORT #4 RS-232 Clear To Send handshaking signal
LCD / Backlight Power Selection
On SBC-C20 board, two dedicated PCB jumpers are available in order to select the LCD and Backlight
Power level that can be supplied.
CN45 is dedicated to the backlight power, while CN46 is dedicated to LCD Power.
Different power level can be supplied according to how jumper pins are closed.
Please refer to the tables on the left to see proper settings for the voltage levels that can be supplied.
A standard 3-way jumper, P2.54mm is used.
RS-232 Connector CN44
Pin Signal
Pin Signal
1
RS232_Tx
2
VDD_3P3V
3
RS232_Rx
4
VDD_5V
5
RS232_RTS
6
VIN_SYS
7
RS232_CTS
8
GND
9
GND
10
GND
Backlight Power (VCC_BKL_SW)
Selector CN45
Position
Voltage Value
1-2
VIN_SYS
2-3
+5V_ALW
LCD Power (VCC_LCD_SW)
Selector CN46
Position
Voltage Value
1-2
VDD_3P3V
2-3
+5V_ALW
