Serial Com1 - Com2 Ports (Com1, Com2) - Kontron KTH81/mITX User Manual

KTD-N0882-I
Serial COM1 – COM2 Ports (COM1, COM2)
7.8
Two RS232 serial ports are available on the KTQ87/KTH81.
The typical definition of the signals in the COM ports is as follows:
Signal Description
Transmitted Data, sends data to the communications link. The signal is set to the marking state (-
TxD
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.
Data Terminal Ready, indicates to the modem etc. that the on-board UART is ready to establish a
DTR
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 (J19), COM2 (J18)
Note Ioh/Iol Type Signal PIN
Note 1: The COM1, COM2 5V supply is fused with common 1.5A resettable fuse.
DB9 adapter cables (PN 821016 200mm long and 821017 100mm long) are available for implementing
standard COM ports on chassis.
Available cable kit (DB9 adapter cables):
PN 821017 - 100 mm or PN 821016 - 200 mm
Page 46
- I DCD 1 2
- I RxD 3 4
O TxD 5 6
O DTR 7 8
- PWR GND 9 10
KTQ87/KTH81 Users Guide
Signal Type Ioh/Iol Note
DSR I -
RTS O
CTS I -
RI I -
5V PWR - 1
Internal Connectors