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CP321
Functional Description
ID 24977, Rev. 02
© 2003 Kontron Modular Computers GmbH
Page 2 - 11
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.
Table 2-5: Serial Port Pinout
PIN
RS-232
SIGNALS
RS-485 SIGNALS
HALF-
DUPLEX
FULL-
DUPLEX
1DSR
N/C
-RxD
2RTS
N/C
N/C
3
GND
GND
GND
4TXD
+TRXD
-TxD
5RXD
N/C
N/C
6
DCD
N/C
+RxD
7CTS
-TRXD
+TxD
8DTR
N/C
N/C
Figure 2-2: RS-232
Serial
Connector
1
8
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