Table of Contents
Advertisement
6.4. RS232/422/485 COM1 Connector (CN26)
The external I/O connector panel supports one DB9 RS232/422/485 port.
Figure 9: RS232/422/485 COM1 Connector CN26
Table 15: Pin Assignment RS232/422/485 COM1 Connector CN26
Pin
RS232 Signal
1
DCD
2
RXD
3
TXD
4
DTR
5
GND
6
DSR
7
RTS
8
CTS
9
RI
Table 16: Signal Description
Signal
Description
DCD
Data Carrier Detect, indicates that the modem or data set has detected the data carrier.
RXD
Received Data, receives data from the communications link.
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.
DTR
Data Terminal Ready, indicates to the modem etc. that the on-board UART is ready to establish
communication link.
GND
Power Supply GND signal
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.
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.
www.kontron.com
RS422 Signal
RS485 Signal
TX-
DATA-
TX+
DATA+
RX+
-
RX-
-
GND
GND
-
-
-
-
-
-
-
-
Note
mITX-DNV - User Guide, Rev. 1.0
// 30
Advertisement
Table of Contents
