19 serial port connector (com3), Figure 3-20: serial port connector location, Table 3-21: serial port connector pinouts – IEI Integration PICOe-HM650 User Manual

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PICOe-HM650 Half-size PCIe CPU Card

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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