Main Features
Supports standard DOS COM1, COM2, COM3, and COM4
Four independent RS-422/485 serial ports
Transmission speeds up to 921.6 Kbps
Independent/shared IRQ settings between each of the 4 serial ports
Wide IRQ selection: 3, 4, 5, 6, 7, 9, 10, 11, 12 or 15

Introduction
PCL-846/847 series cards provide four independent RS-422/485 serial ports on a card. Each port has a 16C550 UART with an on-chip 16-byte FIFO buffer for reliable, high-speed serial I/O. The UART buffers data into 16-byte packets before putting it on the bus. This drastically reduces the CPU load and avoids data loss when the system is busy and cannot process the interrupt quickly. The UART is especially useful for high speed serial I/O under Windows.

Ordering Information
Part Number Description
PCL-846A-A 4-Port RS-422/485 CommCard W/Isolation Protect
PCL-846B-A 4-Port RS-422/485 CommCard W/Isolation&Surge