User`s manual

56 • Extension Modules
5.6 PMC-3544G
 5.6.1 Features
• IRQ and IO address automatically assigned by PCI plug-n-play
• communication ports with intelligent buffer
• RS-422/485 hardware selectable
• RS-485 with auto direction flow control
• High speed concurrent communications (max. 115200 bps
 5.6.2 Specifications
• Compliant with PCI Spec.2.1
• Serial communication controller:
• 16C550A compatible
• System IO mapping:
• Assigned by PCI BIOS
• Shared IRQ
• Flow control
• RS-485 auto direction
• Port Capability:
• 4ch RS-422/485 port (DIP switch select)
• Baud rate: Each port can be configured to 50-115,200 bps
 5.6.3 Pin Assignment
Pin RS-422 RS-485
1 RX+ NC
2 TX+ NC
3 NC NC
4 NC DATA+
5 GND GND
6 RX- NC
7 TX- NC
8 NC NC
9 NC DATA-