Serial Port Function; Overview - Bolymin BETA903A User Manual

4.3.

Serial Port Function

4.3.1.

Overview

BETA903A supports 5 serial ports. And through these serial port, designer may control GSM,
GPS and internal debug port. Below table lists the function of each serial port:
Name Function
COM1: GSM control port
COM4: GPS control port
COM3: Used by application program.
COM6: Used by application program.
Debug port For internal use only.
BETA903A USER MANUAL
Comment
Detail information could be found in section 4.4
Detail information could be found in section 4.5
2-wire RS232
8-wire RS232
Can not be opened by application program.
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