IEI Integration NANO-9453 v1.12 - Manual (Page 84)

NANO-9453 EPIC Motherboard
Page 66
CN Pinouts: See Table 4-18
The 4-pin serial port connector supports RS-422 or RS-485 serial port.
Figure 4-18: RS-422/485 Serial Port Connector Location
PIN NO. DESCRIPTION
1 TXD485#
2 TXD485+
3 RXD485+
4 RXD485#
Table 4-18: RS-422/RS-485 Serial Port Connector Pinouts
4.2.17 4-port Serial Port Connector (RS-232)
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.