IEI Integration NANO-9453 v1.0 - Manual (Page 74)

NANO-9453 EPIC Motherboard
Page 56
CN Label: COM
CN Type: 40-pin header (2x20)
CN Location: See Figure 4-19
CN Pinouts: See Table 4-19
The 40-pin serial port connector contains the following four serial ports, COM 1, COM 2,
COM 3 and COM 4. COM 3 and COM 4 are RS-232 serial communications channels.
COM 2 is a multi function channel. In default mode COM 2 is an RS-232 serial
communication channel but, with the COM 2 function select jumper, can be configured as
either an RS-422 or RS-485 serial communications channel. The serial port locations are
specified below.
COM 1 is located on pin 1 to pin 10
COM 2 is located on pin 11 to pin 20
COM 3 is located on pin 21 to pin 30
COM 4 is located on pin 31 to pin 40
Figure 4-19: 4-port Serial Port Connector Pinout Locations
PIN NO. DESCRIPTION PIN NO. DESCRIPTION
1 DATA CARRIER DETECT (DCD1) 2 DATA SET READY (DSR1)
3 RECEIVE DATA (RXD1) 4 REQUEST TO SEND (RTS1)
5 TRANSMIT DATA (TXD1) 6 CLEAR TO SEND (CTS1)