KTD-00781-A
KTG41 family
Page 33 of 78
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3.9 Serial
Ports
Two RS232 serial ports are available on the KTG41.
The typical definition of the signals in the COM ports is as follows:
Signal Description
TxD
Transmitted Data, sends serial data to the communications link. The signal is set to the marking
state (-12V) on hardware reset when the transmitter is empty or when loop mode operation is
initiated.
RxD
Received Data, receives serial data from the communications 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 communications
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 ringing signal from the telephone line.
The connector pinout for each operation mode is defined in the following sections.
3.9.1 COM1 Connectors
COM1 is RS232 port available in the IO Bracket area. The pinout of Serial ports Com1 is as follows:
Note
Pull
U/D
Ioh/Iol Type Signal PIN Signal Type Ioh/Iol
Pull
U/D
Note
-
-
PWR GND
5
9
RI
I
-
/5K
-
O
DTR
4
8
CTS
I
-
/5K
-
O
TxD
3
7
RTS
O
-
/5K
-
I
RxD
2
6
DSR
I
-
/5K
/5K
-
I
DCD
1
