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Pin
1
2
3
4
3.2.3 Signal cable of USB interface module
USB interface cable adopts standard USB A TO B cable, cable length1.5M. USB interface cable
accord with USB2.0 standard.
3.2.4 Parameters of the USB Interface Module
The USB interface supports USB2.0 protocol and can concatenate through USB HUB.
3.2.5 Troubleshooting of the Interface Module
Error phenomena: Data can not be sent out, data can not be received.
Error causes:
1)
Cables are not connected securely.
2)
Some parts on the USB interface circut are void welded or damage.
Error detects and debugs:
1)
Change to a new USB cable and test again.
2) Check if the capacitors and resistors are welded normally. Replace U101 and test again if they are
welded normally.
signal
VCC
DATA+
DADA-
GND
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BTP-R880NPII Service Manual
Signal define
Power
Data +
Data -
Ground
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Troubleshooting
