Queclink GV75W - UART Interface; USB Interface; Indicator Light Description

GV75WUserManual  
TRACGV75WUM001 ‐13‐
3.7. UARTInterface
Thereis one UARTinterface onGV75W.UART isused forconfiguration,firmware download,and
communicatingwithexternaldevicessuchasCANBusmoduleandRFIDreader. 
PleasenotetheUARTinterfacesareallRS232level.ForRS232level,validsignalsare3Vto15Vand‐
3Vto‐15V,andthe‐3Vto+3Visnotavalidlevel.3Vto15Vcorrespondswithlogic0ofTTLlevel,
while‐3Vto‐15Vcorrespondswithlogic1.
The examples of connections of UART with female DB‐9 and with external devices are shown as
follows.
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Figure7:TheConnectionofUARTwithFemaleDB‐9
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Figure8:TheConnectionofUARTwithExternalDevices 
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3.8.  USBInterface
Gv75WhasoneUSBinterfacewhichisusedforfirmware download and connects to the
GV75W_UART_USB_PWR_Convert_CABLE(optional).TheGV75W_UART_USB_PWR_Convert_CABLE
isusedwhendownloadingthefirmware.
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3.9. IndicatorLightDescription
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Figure9:GV75WLED
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LED DeviceStatus LEDStatus