5. Each Component Function
54 User’s Manual
RS-422/485 Port (Serial port D)
The BOX-PC is equipped with a serial port for one channel inside
the RAS connector. BIOS setup (see Chapter 4) allows I/O
addresses, interrupts and "not in use" to be set. (The port cannot
be set to the same I/O address or interrupt as of another device.)
Table 5.7. Serial Port D I/O Addresses and Interrupts
COM I/O Address Interrupt
1 3F8h-3FFh
2 2F8h-2FFh
3 3E8h-3EFh
4 2E8h-2EFh
IRQ 3
IRQ 4
IRQ 5
IRQ 7
IRQ 9
IRQ 10
IRQ 11
IRQ 15
The BIOS defaults to the following factory settings:
Serial port D : Disable
RS-422/RS-485 Specifications
- Transmission method : RS-422/RS-485-compliant,
asynchronous, serial transmission, half
duplex/full duplex
- Baud rate : 19,200-50bps (programmable)
- Signal extension distance: 1.2km Max.
Output Connector When RS-422/RS-485 Is in Use
Table 5.8. Output Connector when the RS-422/RS-485 Is in
Use (RAS Connector)
Pin No. Signal
2 TX + Transmitted data +
10 TX - Transmitted data -
3 RX + Received data +
11 RX - Received data -
Meaning
For more information on the RAS connector see Table 5.16., "RAS
connector."
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