GND1LOWPOWER2GPIOD2/DSRD#3GND4VCC5GPIOA5/RTSA#/RS485A6GPIOA4/CTSA#7TXB8RXB9GPIOB5/RTSB#/RS485B10GPIOB4/CTSB#11GPIOB3/DTRB#12GPIOB2/DSRB#13GPIOB1/CDB#14GPIOB0/RIB#15GPIOA3/DTRA#16GPIOA2/DSRA#17VCC18GND19GPIOA1/CDA#20GPIOA0/RIA#21TXC22RXC23GPIOC5/RTSC#/RS485C24GPIOC4/CTSC#25GPIOC3/DTRC#26GPIOC2/DSRC#27GPIOC1/CDC#28GPIOC0/RIC#29TXA30RXA31GND32VCC33GPIOD1/CDD#34SDA35SCL36GPIOD0/RID#37TXD38RXD39GND40GND41USBD-42USBD+43VCC44VCC45GPIOD5/RTSD#/RS485D46GPIOD4/CTSD#47GPIOD3/DTRD#48