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KTD-00699-S
4.8
Serial Ports
Two RS232 serial ports are available on the KT965 boards
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 Pin Header Connector.
The pinout of Serial ports Com2 is as follows:
Pull
Note
U/D
Ioh/Iol
-
-
-
-
-
-
Note 1: The Com2 header 5V supply is fused with a 1.1A resetable fuse.
If the DB9 adapter (ribbon cable) is used, the DB9 pinout will be identical to the pinout of Serial Com1
KT965 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: 2010-04-15
PIN
Signal
Type
5
9
RI
4
8
CTS
3
7
RTS
2
6
DSR
1
PIN
Signal
1
2
DSR
3
4
RTS
5
6
CTS
7
8
RI
9
10
5V
Page
38 of 90
Pull
Ioh/Iol
U/D
I
-
/5K
I
-
/5K
O
-
I
-
/5K
Pull
Type
Ioh/Iol
U/D
I
-
O
-
I
-
I
-
PWR
-
-
Note
Note
1
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