IEI Integration NANO-9452 v1.00 - Manual (Page 74)

NANO-9452 EPIC Motherboard
Page 56
PIN NO. DESCRIPTION PIN NO. DESCRIPTION
7 DTR 8 NRI2
9 GND 10 GND
11 TXD485+ 12 TXD485#
13 RXD485+ 14 RXD485#
Table 4-19: RS-232/RS-485 Serial Port Connector Pinouts
4.2.18 Serial Port Connector (COM 3 and COM 4)
CN Label: COM3 and COM4
CN Type: 10-pin header (2x5)
CN Location: See Figure 4-20
CN Pinouts: See Table 4-20
The 10-pin serial port connector provides a second RS-232 serial communications
channel. The COM 2 serial port connector can be connected to external RS-232 serial port
devices.
Figure 4-20: COM3 and COM4 Connector Pinout Locations
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)