How to Develop Serial Port for Terminals

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Demo

Here is a demo about how to develop an app using Java API, please download SerialPortDemo


A serial port test tool Source APP, and APK

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Java API

When using the Java API to open a serial port, you need to set the logic ID of a serial port as a parameter.

  • SerialPortDevice.ID_USB_SLAVE_SERIAL : works for USB serial port in slave mode.
  • SerialPortDevice.ID_USB_HOST_SERIAL : works for USB serial port in master mode.
  • SerialPortDevice.ID_SERIAL_EXT : works for internal fiscal/ other serial port module.
  • SerialPortDevice.ID_USB_CDC: works for USB Communication Device Class.

C API

When using the C API to open a serial port, you need to set the device name of a serial port as a parameter.

Device Name:

Parameters
device name The alias for serial port. Available values: DB9, GS0_01, WIZARHANDQ1, Q1_USB_SERIAL, USB_SERIAL, SERIAL_EXT, USB_SLAVE_SERIAL, USB_HOST_SERIAL
  • in W1/W1V2:
    • DB9: works for DB9 port at the back side of the terminal.
    • GS0_Q1: works for USB host port at the right side of terminal to connect with Q1 via USB cable in master mode.
  • in Q1 3g:
    • WIZARHANDQ1: works for USB serial port in slave mode.
    • Q1_USB_SERIAL or USB_SERIAL: works for USB serial port in master mode.
    • SERIAL_EXT: works for internal fiscal/other serial port module.
  • in Q1 4g and Q2(K2, M2, M3, QD4/5), Q3 series and others:
    • USB_SLAVE_SERIAL: works for USB serial port in slave mode. For example, terminal use USB OTG cable connect the PC directly.
    • USB_HOST_SERIAL or USB_SERIAL: works for USB serial port in master mode. For example, terminal connect an USB2Serial convertor or use UU cable.
    • SERIAL_EXT: works for internal fiscal/other serial port module.
    • USB_CDC: works for USB Communication Device Class.



Cable Connection

Please check follow pictures

  • Q4: use picture 2 and picture 3, the Usb to DB9 cable ; or picture 4 the UU cable

Cables

OTG to USB Host TypeA Female:

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USB to Serial port cable, USB TypeA Male to DB9 Female:

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USB to Serial port cable, USB TypeA Male to DB9 Male:

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UU cable, 2 USB Serial port cable cross connected together:

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