CP605
Functional Description
ID 25095, Rev. 07
© 2004 Kontron Modular Computers GmbH
Page 2 - 13
2509
5.07.UG.VC.041005/14145
9
2.5.5
Serial Port Interfaces COM1 and COM2
Figure 2-4: Serial Connectors CON9 (COM1) and CON10 (COM2)
Two PC-compatible serial 9-pin D-sub ports are available, which are fully
compatible with the 16550 controller and include a complete set of hand-
shaking and modem control signals, maskable interrupt generation and
data transfer of up to 460.8 kB/s.
Serial Ports COM1 and COM2 can be enabled/disabled under SW con-
trol. Selection can be made inside the BIOS or via the rear I/O configura-
tion register. The standard software configuration is front I/O.
The two COM interfaces may be configured as either RS-232, RS-422 or
RS-485 ports by setting the appropriate solder jumpers. The standard set-
ting of the two COM ports envisages the RS-232 configuration.
RS-422 configuration:
The RS-422 interface uses two differential data lines RX and TX for communication (Full-Duplex)
RS-485 configuration:
The RS-485 interface uses one differential data line. It differs from the RS-422 mode in that it
provides the ability to transmit and receive over the same wire. The RTS signal is used to en-
able the RS-485 transmitter.
The following table indicates the pinout of the Serial Port Connectors CON9 (COM1) and
CON10 (COM2). The pinout of the 9-pin D-sub connectors depends on the configuration.
2.5.6
Serial Port Interfaces COM3 and COM4
Additionally, two PC-compatible serial ports with TTL signal level are available. These two
COM ports, which are fully compatible with the 16550 controller, include a complete set of
handshaking and modem control signals, maskable interrupt generation and data transfer.
The
COM3 and COM4 ports are only available on the CompactPCI rear I/O interface
.
Table 2-10: Serial Port Connectors CON9 (COM1) and CON10 (COM2) Pinout
PIN
RS-232
(Standard PC)
RS-422
RS-485
1
DCD
+RXD
NC
2
RXD
NC
NC
3
TXD
+TXD
+TRXD
4
DTR
NC
NC
5
GND
GND
GND
6
DSR
-RXD
NC
7
RTS
NC
NC
8
CTS
-TXD
-TRXD
9
RIN
NC
NC
1
5
6
9
