2.2.2
CPU-Module RS232 Interfaces
The installed mainboard provides 3 serial interfaces. However, depending on
the model these interfaces are completely or only partly available at the
chassis. COM 2 – COM 3 do not possess an RI signal.
The signal level of the serial interfaces can be changed between 5 and 12 V
by means of a jumper. COM3 interface is reserved for internal purpose and
can not be used.
This interface type is used for COM 1
SERIAL PORT
Pin Direction Description
RS232 DTE
DB9 male connector
1
INPUT
DCD Data Carrier Detect
2
INPUT
RXD Receive Data
Subject to alterations
Version
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IPC191 V2 WIN Manual
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3
OUTPUT
TXD Transmit Data
4
OUTPUT
DTR Data Terminal Ready
5
GND Ground
6
INPUT
DSR Data Set Ready
7
OUTPUT
RTS Request To Send
8
INPUT
CTS Clear To Send
9
INPUT
RI Ring Indicator
Figure 3.
Pin Assignment of DB9 Interface (Computer) COM1
This interface type is used for COM 2 – COM 4
SERIAL PORT
Pin Direction Description
RS232 DTE
DB9 male connector
1
INPUT
DCD Data Carrier Detect
2
INPUT
RXD Receive Data
3
OUTPUT
TXD Transmit Data
4
OUTPUT
DTR Data Terminal Ready
5
GND Ground
6
INPUT
DSR Data Set Ready
7
OUTPUT
RTS Request To Send
8
INPUT
CTS Clear To Send
9
Figure 4.
Pin Assignment of DB9 Interface (Computer) COM2 – COM4
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