IEI Integration PICOe-HM650 - Manual (Page 49)

PICOe-HM650 Half-size PCIe CPU Card
Page 35
3.2.19 Serial Port Connector (COM3)
CN Label: COM3
CN Type: 4-pin header (1x4)
CN Location: See Figure 3-20
CN Pinouts: See Table 3-21
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.
Figure 3-20: Serial Port Connector Location
Pin Description
1 RXD485#
2 RXD485+
3 RXD485-
4 RXD485#
Table 3-21: Serial Port Connector Pinouts