Technical features:

• 5V 32bit 33MHz PCI bus (the most common on current PCs)
• 2 fully insulated (also between them) serial ports
• Chipset with 128 bytes FIFO buffer (16C950 compatibile)
• Each port configurable as RS232 (4 signals: TXD,RXD,RTS,CTS), RS485 (half duplex) or RS422 (full duplex)
• Automatic hardware handling of RS485 direction control signal
• Configurable output's slew-rate, to lower EMI

Included software: