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2-port RS-422/485 Cards with 3000 VDC

PCL-745S Introduction

The PCL-743/745 series card both provide two RS-422/485 serial ports. Each port has a 16C550 UART with 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 CPU load and avoids data loss when the system is busy and cannot process the interrupt quickly, and is especially useful for high speed serial I/O under Windows.

The PCL-745B/745S differs from the PCL-743B/743S card in that the former uses on-board optical isolators to protect your PC and equipment against damage from ground loops, increasing system reliability in harsh environments. To further increase reliability, the PCL-743S/745S offers a surge protection technology, protecting your system from abrupt high voltage surges (up to 2500 VDC) such as those caused by lightning during thunderstorms.

PCL-745S Features

  • Two independent RS-422/RS-485 serial ports
  • Provides 3000 VDC isolation
  • Provides 2500 VDC surge protection
  • 16C550 UARTs with on-chip 16-byte FIFO
  • Transmission speeds up to 921.6 Kbps
  • I/O address and interrupt selectable
  • Wide IRQ selection: 3, 4, 5, 6, 7, 9, 10, 11, 12 or 15
  • Supports 2 wire or 4 wire operation
  • Supports Tx, Rx, RTS, and CTS signals
  • Automatic RS-485 data flow control or RTS control
  • Space reserved for termination resistors
  • Space reserved for optional surge protection on data lines
  • Supports standard DOS COM1, COM2, COM3, and COM4
  • Includes PC-ComLIB software

PCL-745S Ordering Information

  • PCL-745B : 2-port RS-422/485 communication card with 3000 VDC isolation protection.
  • PCL-745S : 2-port RS-422/485 communication card with 3000 VDC isoation and 2500 VDC surge protection.
  • PCL-743B : 2-port RS-422/RS-485 communication card.
  • PCL-743S : 2-port RS-422/485 communication card with surge protection.

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