KTQ67/Flex -Medical Users Guide
KTD-N0849-C Page 31
5.4 COM1 and COM2 Connectors (IO Area)
Four RS232 serial ports are available on the KTQ67/Flex-Medical, COM1 and COM2 are available in
the IO Area while the other COM ports are available on internal pin header connectors.
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 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
IO-Area Connectors
