Installation Instructions

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3 DGND
 3.2.4DIPSwitchforselect
Bit Description Single
1 ON:havematchedresistanceof120ohm
OFF:haveno
Term
2 ON:havepullupresisterof510ohm
OFF:haveno
Bias‐
3 ON:havepulldownresisterof510ohm
OFF:haveno
Bias+
4 ON:selectRS232
OFF:selectRS485
SelectRS232or
RS485
 3.2.5DIPSwitchforboot
OPEN: BootfromNAND
SHORT:BootfromSD/MMC
 3.2.6LED
PWR LED: lightindicatesystem power OK(main power up); off indicate system power turn off
ERR LED: User can define by themself.
SS LED: User can define by themself.
TX LED: when UART1 send data, it can blink
RX LED: when UART1 receive data, it can blink