Kontron mITX-HSW-S, Руководство пользователя

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mITX-HSW-S - User Guide, Rev. 1.1
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6.6. Serial COM1 Port (CN3)
The external I/O connector panel supports one DB-9 RS-232/422/485 COM male port.
Figure 12: Serial COM1 Port CN3 - COM1
Table 17: Pin Assignment Serial COM1 Port CN3 - COM1
Pin RS232 Signal RS422 Signal Half Duplex
RS485 Signal Full Duplex
RS485 Signal Note
B1 DCD TX- DATA- TX-
B2 RXD RX+ N/A RX+
B3
TXD TX+ DATA+ TX+
B4 DTR RX- N/A RX-
B5 GND GND GND GND
B6 DSR N/A N/A N/A
B7 RTS N/A N/A N/A
B8 CTS N/A N/A N/A
B9 RI* N/A N/A N/A
*: Pin configuration can be selected by Jumper JP12.
RS232 / 422 / 485 can be selected in BIOS setup.
Table 18: Signal Description
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
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.
TX+/- Transmitted Data differential pair sends data to the communications link.
RX+/- Received Data differential pair receives data from the communications link.