Kontron 986LCD-M-mITX (BGA) - Manual (Page 41)

986LCD-M Family
KTD-N0837-B Public User Manual Date: 2012-04-17 Page 41 of 91
4.9 Serial Ports
Four RS232 serial ports are available on the 986LCD-M boards
The typical interpretation of the signals in the COM ports is as follows:
Signal Description
TxD Transmitte Data, sends serial data to the device. The signal is set to a marking state on
hardware reset when the transmitter is empty or when loop mode operation is initiated.
RxD Receive Data, receives serial data from the communication link.
DTR Data Terminal Ready, indicates to the device that the on-board UART is ready to establish a
communication link.
DSR Data Set Ready, indicates that data set is ready to establish a communication link.
RTS Request To Send, indicates to the device 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 telephone-ringing signal.
The connector pinout for each operation mode is defined in the following sections.
4.9.1 Com1 (Port1) DB9 Connector.
* = +/-12V signals.
4.9.2 Com2, Com3 & Com4 Pin 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
- AI* DCD 1 2 DSR AI* -
- AI* RxD 3 4 RTS AO* -
- AO* TxD 5 6 CTS AI* -
- AO* DTR 7 8 RI I -
- - PWR GND 9 10 5V PWR - - 1
* = +/-12V signals.
Note 1: 5V supply is shared with supply pins in Com2/Com3/Com4 headers. The common fuse is 1.1A.
If the DB9 adapter (ribbon cable) is used, the DB9 pinout will be identical to the pinout of Serial Com1.
Note
Pull
U/D Ioh/Iol Type Signal
PIN
Signal Type Ioh/Iol
Pull
U/D Note
- - PWR GND 5 9
RI I - /5K
- AO* DTR 4 8
CTS AI* - /5K
- AO* TxD 3 7
RTS AO* -
/5K - AI* RxD 2 6
DSR AI* - /5K
/5K - AI* DCD 1