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KTD-00474-U
4.8 Serial Ports
Four RS232C serial ports are available on the 886LCD-M/Flex, 886LCD-M/ATX and 886LCD-M/mITX.
The typical interpretation of the signals in the COM ports is as follows:
Signal
Description
TxD
Transmitte Data, sends serial data to the communication link. The signal is set to a marking
state on hardware reset when the transmitter is empty or when loop mode operation is
initiated.
RxD
Receive Data, receives serial data from the communication link.
DTR
Data Terminal Ready, indicates to the modem or data set that the on-board UART is ready to
establish a communication link.
DSR
Data Set Ready, indicates that the modem or data set is ready to establish a communication
link.
RTS
Request To Send, indicates to the modem or data set that the on-board UART is ready to
exchange data.
CTS
Clear To Send, indicates that the modem or data set is ready to exchange data.
DCD
Data Carrier Detect, indicates that the modem or data set has detected the data carrier.
RI
Ring Indicator, indicates that the modem has received a telephone-ringing signal.
The connector pinout for each operation mode is defined in the following sections.
4.8.1
Com1 (Port1) DB9 Connector.
Pull
Note
U/D
Ioh/Iol
-
-
-
-
/5K
-
/5K
-
4.8.2
Com2, Com3 & Com4 Pin Header Connectors.
The pinout of Serial ports Com2 (Port2), Com3 (SIO Port1) and Com4 (SIO Port2) is as follows:
Pull
Note
U/D
Ioh/Iol
-
-
-
-
-
-
Note 1: 5V supply is shared with supply pins in Com2/Com3/Com4 headers. The common fuse is 1.1A.
If the DB9 adapter (ribbon cable) is used, the DB9 pinout will be identical to the pinout of Serial Com1
886LCD-M Family
Public
User Manual
Type
Signal
PWR
GND
O
DTR
O
TxD
I
RxD
I
DCD
Type
Signal
I
DCD
I
RxD
O
TxD
O
DTR
PWR
GND
Date: 2010-06-22
PIN
Signal
Type
5 9
RI
I
4 8
CTS
I
3 7
RTS
O
2 6
DSR
I
1
PIN
Signal
1
2
DSR
3
4
RTS
5
6
CTS
7
8
RI
9
10
5V
Page
39 of 81
Pull
Ioh/Iol
U/D
-
/5K
-
/5K
-
-
/5K
Pull
Type
Ioh/Iol
U/D
I
-
O
-
I
-
I
-
PWR
-
-
Note
Note
1
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