IEI Integration NANO-HM651 - Manual (Page 43)

NANO-HM651 EPIC SBC
Page 29
Figure 3-16: COM Connector Locations
Pin Description Pin Description
1 -NDCD 6 -NCTS
2 -NDSR 7 -NDTR
3 NSIN 8 -XRI
4 -NRTS 9 GND
5 NSOUT 10 GND
Table 3-17: COM Connector Pinouts
3.2.16 Serial Port Connector (COM3)
CN Label: COM3
CN Type: 4-pin wafer (1x4)
CN Location: See Figure 3-17
CN Pinouts: See Table 3-18
NOTE:
These pins are shared with those on the main serial port. Use either
the pins on the main connector, or on this connector, but not both.
This connector provides RS-422 or RS-485 communications.