Kontron KTQ45-FLEX - Manual (Page 35)

KTD-00782-I KTQ45 family Page 35 of 92
3.8 Serial Ports
Two RS232 serial ports are available on the KTQ45/Flex.
Three RS232 serial ports and one RS485 port are available on the KTQ45/ATXE.
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.
3.8.1 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