Subject to alterations
Version 3.1
IPCOMM GmbH
- 5 -
Industrial PC IPC191I7
Walter-Bouhon-Strasse 4
Copyright © IPCOMM GmbH, 2021
90427 Nuremberg
All rights reserved
Germany
2.2.2
Onboard RS-232 Interfaces
The installed mainboard provides two integrated serial interfaces.
COM1
– COM2
SERIAL PORT
RS-232 DTE
DB9 male connector
Pin
Direction
Description
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
INPUT
RI
Ring Indicator
Figure 4: pin assignment of DB9 9-PIN DTE RS-232 interface (mainboard) COM1-COM2
Note:
For the adequate protection against the impact of switching interferences (Burst) and surge
voltage, we recommend the use of our 4 kV isolated RS-232 isolator. The used RS-232 transceivers
have ESD protection up to 15 kV. The isolator was tested according to EMC guidelines and climatic
and mechanical requirements in compliance with the standard IEC 61850-3.
2.2.3
8-Port RS-232 Serial Interface Card
(RS-232 interface for remote communication)
Depending on the model each IPC191I7 can be equipped with an 8-port or 16-port serial interface
card. The following pin assignment is realized with an 8-port DB9 male connector cable (see Figure 3).
SERIAL PORT
RS-232 DTE
DB9 male connector
Pin
Direction
Description
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
INPUT
RI
Ring Indicator
Figure 5: pin assignment of DB9 interface at serial interface card
See note chapter 2.2.2
