3 rs-232/422/485 serial port (com5), 4 usb 2.0 connectors (usb_con2), 5 usb 3.0 connectors (usb_con1) – Maple Systems PC419C User Manual
Page 121: Table 6-26: rs-232/422/485 serial port pinouts, Table 6-27: usb 2.0 connectors (usb_con2) pinouts
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