User manual

Installation Instructions
EC3-1816CLD2NA - 9 -
2. This motherboard provides three 2×5Pin COM ports (pitch: 2.0mm). Their pin
definitions are as follows:
Pin Signal Pin Signal
1 DCD# 2 RXD
3 TXD 4 DTR#
5 GND 6 DSR#
7 RTS# 8 CTS#
COM2～COM4
9 RI# 10 NA
2.6 LCD Backlight Control Connector
This board provides one 1×4Pin wafer LCD backlight control connector (pitch:
2.0mm). Its pin definitions are as follows:
Pin Signal
1 VCC_LCDBKLT
2 LCD_BKLTCTL
3 LCD_BKLTEN
LCDB1
4 GND
Notes:
VCC_LCDBKLT--- backlight power (+12V); the current should be limited below
1A.
LCD_BKLTCTL--- backlight control (The signal is output directly from CPU,
and is PWM signal; voltage amplitude 0V—3.3V, duty cycle is within 0-100%);
LCD_BKLTEN --- backlight enabling signal, active high. (The signal is output
directly from CPU, CMOS output, voltage amplitude 0V-3.3V.)