Serial Ports Com1 And Com2 (J21, J25) - Kontron mITX-BDW-U User Manual

7.10. Serial Ports COM1 and COM2 (J21, J25)

The mITX-BDW-U provides two RS232 serial ports.COM1 (J21) and COM2 (J25).
Serial Port COM1 and COM2 connector Pinout
Note Ioh/Iol Type
I
I
O
O
PWR
1)
Signal Description
TxD Transmitted Data, sends data to the communications link. The signal is set to the marking state
(-12 V) 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.
DB9 adapter cables (PN 821016 200 mm long and 821017 100 mm long) are available for implementing standard COM
ports on the chassis.
Available cable kit (DB9 adapter cables):
PN 821017 - 100 mm or PN 821016 - 200 mm
www.kontron.com
Signal PIN
DCD 1
RxD 3
TxD 5
DTR 7
GND 9
The COM1, COM2 supply voltage (5 V) is fused with common 1.5 A resettable fuse.
Signal Type
2 DSR I
4 RTS O
6 CTS I
8 RI I
10 5V PWR
mITX-BDW-U – User Guide, Rev. 1.6
Ioh/Iol Note
1
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