7 serial com2 – com4 ports (j19, j20, j21), Serial com2 – com4 ports (j19, j20, j21), Internal connectors – Kontron KTQ67-FLEX User Manual
Page 44
KTQ67 Users Guide
KTD-N0829-G Page 44
6.7 Serial COM2 – COM4 Ports (J19, J20, J21)
Three RS232 serial ports are available on the KTQ67 via pin-row connector. (COM 1 is in the IO area
and is based on standard DB9 connector, see other section for more info).
The typical definition of the signals in the COM ports is as follows:
Signal Description
TxD
Transmitted Data, sends 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 data from the communications link.
DTR
Data Terminal Ready, indicates to the modem etc. that the on-board UART is ready to
establish a communication link.
DSR
Data Set Ready, indicates that the modem etc. is ready to establish a communications link.
RTS
Request To Send, indicates to the modem etc. 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 pinout of Serial ports COM2 (J20), COM3 (J19) and COM4 (J21) is as follows:
Note Ioh/Iol Type Signal
PIN
Signal Type Ioh/Iol Note
-
I
DCD
1 2
DSR
I
-
-
I
RxD
3 4
RTS
O
O
TxD
5 6
CTS
I
-
O
DTR
7 8
RI
I
-
-
PWR GND
9 10
5V
PWR
-
1
Note 1: The COM2, COM3 and COM4 5V supply is fused with common 1.1A resettable fuse.
DB9 adapter cables (PN 821016 200mm long and 821017 100mm long) are available for implementing
standard COM ports on chassis.
Internal Connectors