Seco SBC-C20 User Manual page 37

RS-232 Connector
RS-232 Connector CN44
Pin Signal Pin
1 RS232_Tx 2
3 RS232_Rx 4
5 RS232_RTS 6
7 RS232_CTS 8
9 GND 10
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
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
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.
SBC-C20 offers an RS-232 interface with flow control (CTS and RTS
signals) on dedicated connector CN44. This interface is managed by
Signal i.MX8M internal UART4 Controller.
CN44 is a dual row 10-pin 2mm p connector, type MOLEX p/n 501645-
VDD_3P3V
1020 or equivalent.
VDD_5V
Mating connector MOLEX 501646-1000 receptacle with MOLEX 501647,
VIN_SYS
501648 or 503096 series female crimp terminals.
GND
Pin configuration is described on the table here.
GND
RS232_Rx : COM PORT #4 RS-232 Receive data
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.
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