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CP321
2.3.3
Serial Interfaces and Pinouts
Two serial ports: TERM (UART A) and SER 0 (UART B) are provided by means of 8-pin RJ45
connectors.
The two serial interfaces are 16C550 compliant and have 128-byte transmit and receive buff-
ers. The TERM port is used to interface with the bootstrap loader, the operating system, and
the application as required. The SER 0 port is used for data transfers as called for by the op-
erating system or the application.
In the case that SER 0, the upper serial interface, is configured as RS232, the two serial ports
are identical and they provide a complete set of handshaking and modem control signals,
maskable interrupt generation and data transfer of up to 115.2 KBaud.
A separate transition module, the CP320-TR1, is also available from Kontron which provides
an optoisolated half/full duplex RS485 interface. When installed, this module replaces the stan-
dard onboard SER 0 interface along with its associated RJ45 connector. See Figure 1-2 and
Appendix B for more details of this module.
Figure 2-2: RS-232
Connector
ID 24977, Rev. 02
Table 2-5: Serial Port Pinout
Serial
PIN
1
1
2
3
4
8
5
6
7
8
© 2003 Kontron Modular Computers GmbH
Functional Description
RS-485 SIGNALS
RS-232
HALF-
SIGNALS
DUPLEX
DSR
N/C
RTS
N/C
GND
GND
TXD
+TRXD
RXD
N/C
DCD
N/C
CTS
-TRXD
DTR
N/C
FULL-
DUPLEX
-RxD
N/C
GND
-TxD
N/C
+RxD
+TxD
N/C
Page 2 - 11
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