IEI Integration IMBA-Q670 v2.01 - Manual (Page 52)

IMBA-Q670 ATX Motherboard
Page 36
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: RS-422/485 Connector Location
PIN NO. DESCRIPTION PIN NO. DESCRIPTION
1 RXD485# 3 TXD485+
2 RXD485+ 4 TXD485#
Table 3-16: RS-422/485Connector Pinouts
3.2.20 Serial Port Connectors, RS-232
CN Label: COM1, COM2, COM3, COM5
CN Type: 10-pin box header
CN Location: See Figure 3-21
CN Pinouts: See Table 3-17
Each of these connectors provides RS-232 connections.