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©2004 Inova Computers GmbHPage C-6 ICP-P4/PM/CM Appendix-C
ITM-RIO
Appendix C
C1.4 COM1 & COM2 Interfaces
The two COM ports feature a complete set of handshaking and modem control signals, maskable
interrupt generation and highspeed data transfer rates. An 8HP rear-panel (Figure C1.2) brings
out the physical COM1 & COM2 interfaces.
Note:
If the COM ports are used in rear I/O
applications then they should not be
used from the CPU front-panel.
The front panel COM port connections
are disabled automatically if using the
rear I/O COM port option.
Figure C1.4 COM1 & COM2 Interface Pinout
1
6
5
9
Table C1.4 COM1 & COM2 Connector Signals
Note:
The standard CPU configuration has both
COM ports set for RS232 communication.
However, this device can be configured (J7
and J8) to observe a two-wire, non
galvanically separated, RS485 protocol.
The data direction is governed by control-
ling the UART’s RTS signal.
RS232 RS485
1 DCD
2 RxD RxD, TxD +
3 TxD RxD, TxD -
4 DTR
5 GND
6 DSR
7RTS
8 CTS
9RI
Pin No.
Signal