User`s manual

MMGA Series CyberResearch

Motherboards

4.2.13 Serial Port Connector (COM2, COM 3 and COM4)

CN Label: COM2, COM3 and COM4

CN Type:

10-pin header (2x5)

CN Location: See Figure 1-34

CN Pinouts: See Table 1-20

The 10-pin serial port connector provides a second RS-232 serial communications

channel. The serial port connectors can be connected to external RS-232 serial port

devices.

Figure 1-34: Serial Connector Location

PIN NO. DESCRIPTION PIN NO. DESCRIPTION

1 Data Carrier Direct (DCD) 2 Data Set Ready (DSR)

3 Receive Data (RXD) 4 Request To Send (RTS)

5 Transmit Data (TXD) 6 Clear To Send (CTS)

7 Data Terminal Ready (DTR) 8 Ring Indicator (RI)

9 Ground (GND) 10 N/C

Table 1-20: Serial Connector Pinouts