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LEC-2010 Fanless Embedded System User’s Manual

2.2.3.21 Serial Port COM1/2 Connector (COM1, COM2)

Pin No. Description

TYPE RS-232 RS-422 RS-485

1 Data Carrier Detect ( DCDA # ) 422TX+ DATA+

2 Receive Data ( RXDA ) 422TX- DATA-

3 Transmit Data ( TXDA ) 422RX+

4 Data Terminal Ready ( DTRA # ) 422RX-

5 Ground ( GND )

6 Data Set Ready ( DSRA # )

7 Request To Send ( RTSA # )

8 Clear To Send ( CTSA # )

9 Ring Indicator ( RIA # )

Note: COM1:RS-232 Only; COM2:RS-232,RS422,RS485

2.2.3.22 COM3 ~ 6 Connector (CN1)

COM3 COM4

Pin No. 20 19 18 17 16 15 14 13 12 11

RS-232 RTS3# SIN3 SOUT3

CTS3#

GND RTS4#

SIN4 SOUT4 CTS4# GND

RS-422 TX+ TX- RX+ RX- GND

RS-485 4-wire TX+ TX- RX+ RX- GND

RS-485 2-wire DATA+ DATA- NC NC GND

COM5 COM6

Pin No. 10 9 8 7 6 5 4 3 2 1

RS-232 RTS5# SIN5 SOUT5

CTS5#

GND RTS6#

SIN6 SOUT6 CTS6# GND

Note: Only COM3 can select RS-232/RS-422/RS-485

Pin1~5: COM6 , Pin6~10: COM5 , Pin11~15: COM4 , Pin16~20: COM3

1 2 ... 33 34 35 36 37 38 39 40 41 42 43 ... 64 65

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