J4 is a standard DB9 connector for the RS232 four-wires UART1 port. The following table reports the connector's pinout:

J5 is a standard DB9 connector for the configurable UART/CAN port. The board provides some mount options for the selection of the UART mode (RS232 (4-wire/RS422/RS485)or the CAN mode. The following table reports the connector's pinout: {| class="wikitable" RS485 (half|-duplex)!Pin# !Pin name!UART mode !CANmode!Notes|-||||||-||||||-||||||-||||||-||||||-|}