IEI Integration ECW-281B-N270-WT v3.01 - Manual (Page 45)

ECW-281B/281B2-R30/N270 Embedded System
Page 30
The 40-pin serial port connector contains the following four serial ports: COM3, COM4,
COM5 and COM6. All these serial ports are RS-232 serial communications channels. The
serial port locations are specified below.
COM3 is located on pin 1 to pin 10
COM4 is located on pin 11 to pin 20
COM5 is located on pin 21 to pin 30
COM6 is located on pin 31 to pin 40
Figure 3-11: COM3 to COM6 Connector Pinout Locations
PIN NO. DESCRIPTION PIN NO. DESCRIPTION
1 DATA CARRIER DETECT (DCD3) 2 DATA SET READY (DSR3)
3 RECEIVE DATA (RXD3) 4 REQUEST TO SEND (RTS3)
5 TRANSMIT DATA (TXD3) 6 CLEAR TO SEND (CTS3)
7 DATA TERMINAL READY (DTR3) 8 RING INDICATOR (RI3)
9 GND 10 GND
11 DATA CARRIER DETECT (DCD4) 12 DATA SET READY (DSR4)
13 RECEIVE DATA (RXD4) 14 REQUEST TO SEND (RTS4)
15 TRANSMIT DATA (TXD4) 16 CLEAR TO SEND (CTS4)
17 DATA TERMINAL READY (DTR4) 18 RING INDICATOR (RI4)
19 GND 20 GND