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ePCI-101 User’s Guide
2.4.3.2 Serial Port 2 (J1)
This serial port is buffered for RS-232, RS-422 or RS-485 operations. The interface includes the
complete signal set for handshaking, modem control, interrupt generation, and data transfer.
Signal Paths:
J1 Serial Port 2 (RS-232, RS-422 or RS485)
Related Jumpers:
JP5 and JP6: insert both jumper if serial port 2 is used in RS-422 or RS-485 mode and need
termination resistors. Termination resistors are 120-ohm.
Bios Settings:
ƒ Advanced \ On-Board Devices Configuration
ƒ Serial port B
ƒ Base I/O address
ƒ
Interrupt
ƒ Mode
Software Usage:
Register 0x190 provide buffer control. See appendix C for details.
Upon a power-up or reset, the Serial Port 2 interface circuit is automatically configured for the
operation mode setup in the BIOS. This Serial Port signal assignation on the connector depends upon
the operation mode (RS-232, RS-422, or RS-485) that has been set:
Pin RS-232 RS-422 RS-485
1 DCD RSV RSV
2 RXD RSV RSV
3 TXD RXB 485B
4 DTR RXA 485A
5 GND TSB RSV
6 DSR TXA RSV
7 RTS RSV RSV
8 CTS RSV RSV
9 RI GND GND
10 CTS N.C. N.C.
RS-232 Protocol
When configured for RS-232 operation mode, the Serial Port 2 is 100% compatible with IBM-AT serial
port signals.
RS-422 Protocol
The RS-422 protocol (Full Duplex) uses both RX and TX lines simultaneously during a communication
session.