Nexcom EBC-3A1 Series, User Manual

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3.3. Interface Introduce
3.3.1. RS232
RS232 Interface
4 RS232 serial ports for user interface control, and all RS232 ports are DTE mode.
The pinout direction please refer below table:
Name Abbreviation Direction
Transmitted Data TXD Output
Received Data RXD Input
Clear to Send CTS Input
Request to Send RTS Output
Data Set Ready DSR Input
Data Terminal Ready DTR Output
Data Carrier Detect DCD Input
Ring Indicator RI Input
Common Ground GND Common
RS232 Specification
Name Value
Baud Rate Up to 500Kbps
Data Bits 5, 6, 7, 8 bits
Parity None, Even, Odd, Mark, Space
Stop Bits 1, 1.5, 2 bits
RS232 Device Node
Connector Device node Pinout Define Section
JCOM4 /dev/ttymxc3 2.3.2.1.4
JCOMA /dev/ttyXRUSB0 2.3.2.1.5
JCOMB /dev/ttyXRUSB1 2.3.2.1.6
JCOMC /dev/ttyXRUSB2 2.3.2.1.7
JCOMD /dev/ttyXRUSB3 2.3.2.1.8
RS232 Sample Code
http://github.com/embux/Example/tree/master/serial_test