User manual

Chapter 2 Installation
EC3-1813CLD2NA(B) - 11 -
Audio Connector
The board provides one 2x5Pin AUDIO pin header (Pitch: 2.0mm).
Pin Signal Name Pin Signal Name
1 LOUT_R 2 LOUT_L
3 GND_AUDIO 4 GND_AUDIO
5 LIN_R 6 LIN_L
7 GND_AUDIO 8 GND_AUDIO
AUDIO1
9 MIC_L 10 MIC_R
Serial Port
The board provides one super-slim DB9 serial port socket and three 2x5Pin serial port
pin headers (Pitch: 2.0mm). COM2 supports RS-232/RS-422/RS-485 mode while the
other three serial ports support RS-232 mode.
Signal Name
COM1 ~ COM4
COM2
Pin
RS-232 RS-422 RS-485
1 DCD# TXD- Data-
2 RXD TXD+ Data+
3 TXD RXD+ NC
4 DTR# RXD- NC
5 GND GND GND
6 DSR#
NC
NC
7 RTS#
NC
NC
8 CTS#
NC
NC
9 RI#
NC
NC
COM1
COM2 ~ COM4
10 NA NA NA
Note: the data transmission direction is controlled automatically at RS-485 mode.