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| When using the '''C API''' to open a serial port, you need to set the device name of a serial port as a parameter.
| | {{Migrating|https://smartpossdk.gitbook.io/cloudpossdk/faq/usb-serial-port/serial-port-development}} |
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| '''Device Name''':
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| {|class="wizarpostable" | |
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| ! scope="row" colspan="2" | Parameters
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| | 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<br>
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| * '''in W1/W1V2:'''
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| ** '''DB9''': works for DB9 port at the back side of the terminal.
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| ** '''GS0_Q1''': works for USB host port at the right side of terminal to connect with Q1 via USB cable in master mode.
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| * '''in Q1 3g:'''
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| ** '''WIZARHANDQ1''': works for USB serial port in slave mode.
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| ** '''Q1_USB_SERIAL''' or '''USB_SERIAL''': works for USB serial port in master mode.
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| ** '''SERIAL_EXT''': works for internal fiscal/other serial port module.
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| * '''in Q1 4g and Q2(K2, M2, M3, QD4/5), Q3 series and others:'''
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| ** '''USB_SLAVE_SERIAL''': works for USB serial port in slave mode. For example, terminal use USB OTG cable connect the PC directly.
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| ** '''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.
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| ** '''SERIAL_EXT''': works for internal fiscal/other serial port module.
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| |}
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| When using the '''Java API''' to open a serial port, you need to set the logic ID of a serial port as a parameter.
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| * SerialPortDevice.ID_USB_SLAVE_SERIAL : works for USB serial port in slave mode.
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| * SerialPortDevice.ID_USB_HOST_SERIAL : works for USB serial port in master mode.
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| * SerialPortDevice.ID_SERIAL_EXT : works for internal fiscal/ other serial port module.
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| <big>Cable Connection</big> Please check follow pictures
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| * Q4: use picture 2 and picture 3, the Usb to DB9 cable ; or picture 4 the UU cable
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| <big>Cables</big>
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| [[File:Otg_usb_1.jpg|frameless|left|thumb|caption]]
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| [[File:Usb_db9_1.jpg|frameless|left|thumb|caption]]
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| [[File:Usb_db9_2.jpg|frameless|left|thumb|caption]]
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| [[File:UUCable.jpg|frameless|left|thumb|caption]]
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