KTQ67/Flex -Medical Users Guide
KTD-N0849-C Page 39
6.7 Serial COM3 – COM4 Ports (J20, J21)
Three RS232 serial ports are available on the KTQ67 via pin-row connector. (COM1 and COM2 are 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 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 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
