Kontron KTGM45-mITX - Manual (Page 42)

KTGM45 Users Guide
KTD-N0793-O Page 42
3.9 Serial Ports
Four RS232 serial ports are available on the KTGM45.
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 connector pinout for each operation mode is defined in the following sections.
3.9.1 COM1 Connector
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
3.9.2 COM2 COM3 and COM4 Header Connectors
The pinout of Serial ports COM2, COM3 and COM4 is as follows:
Note Pull
U/D Ioh/Iol Type Signal
PIN Signal Type Ioh/Iol Pull
U/D 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 individual 1.1A resettable fuses.
A DB9 adapter (ribbon cable) is available for connecting the COM ports to I/O front panel.
Connector Definitions