• Two independent RS-422/485 serial ports
  • Provides 3000 VDC isolation
  • 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
  • Termination resistors jumper enable/disable
  • Space reserved for optional surge protection on data lines
  • Supports Windows® 98/2000/XP, Linux®

The PCL-745 series card provides two RS-422/485 serial ports.Each port utilizes a 16C550 UART with an on-chip 16-byte FIFO buffer for reliable, high-speed serial I/O. The UART buffer divides data into 16-byte packets before sending them onto the bus. This drastically reduces the CPU load and avoids data loss due to failure to respond to the interrupt request in time. The UART is especially useful for high speed serial I/O under Windows. The PCL-745B card differs from the PCL-743B card in that the former uses on-board optical isolators to protect your PC and equipment against damages from ground loops, increasing system reliability in harsh environments.


Specifi cations


Card Interface ISA

Certifications CE

Connectors PCL-740: 1 x DB9-M, 1 x DB25-M

PCL-741, PCL-743, PCL-745: 2 x DB9-M

PCL-746+: 1 x DB37-F

Dimensions 185 x 100 mm(7.3" x 3.9")

Power Consumption PCL-740: +5 V @ 180 mA max., ±12 V @ 20 mA max.

PCL-741: +5 V @ 300 mA (typical), +5 V @1.1 Amax.

PCL-743,PCL-745:+5V@400 mA typical, 950 mA max.

PCL-746+: +5 V @ 800 mA typical,1.5 Amax.

±12 V @ 60 mA typical, 120 mA max.

Weight (Gross) PCL-740,PCL-741, PCL-743, PCL-745:0.6 kg(1.3 lb)

PCL-746+:1.1 kg(2.4 lb) (including cable)


Data Bits 5, 6, 7, 8

Data Signals


Current loop:Tx+,Tx-, Rx+, Rx-

RS-422: Tx+, Tx-, Rx+, Rx-, GND, CTS+, CTS-, RTS+, RTSRS-

485: Data+, Data-, GND

I/O Address From 200H to3F8H (for PCL-740/741/743/745)

From 000h to3F8H (for PCL-746+)

IRQ 3, 4, 5, 6, 7, 9, 10, 11, 12 or 15

Ports PCL-740: 1, PCL-741: 2

PCL-743, PCL-745: 2

PCL-746+: 4

Parity None, even, odd

Protocols PCI-740: RS-232/422/485, current-loop

PCI-741: RS232, current-loop

PCI-743, 745: RS-422/485

PCI-746+: RS-232/422/485

Speed PCL-740, PCL-741: 50 bps ~115.2 kbps

(for RS-232/422/485)

50 bps~57.6 kbps (current-loop)

PCL-743, PCL-745: 50 bps ~ 921.6 kbps

PCL-746+: 50 bps ~ 115.2 kbps

Stop Bits 1, 1.5, 2

UART PCL-743, PCL-745: 2 x16C550 with 16-byte FIFO

PCL-746+: 4 x16C550 16-byte FIFO

PCL-740: 1 x16C550 with 16-byte FIFO

PCL-741: 2 x16C550 with 16-byte FIFO


Isolation Protection 2500 VDC (PCL-741), 3000 VDC (PCL-745B/745S)

EFT Surge Protection 2500 VDC (PCL-743S/745S)


Bundled Software ICOM Tools

Driver Support Windows 98/ME/2000/XP, Linux


Operating Temperature PCL-740,PCL-741,PCL-746+: 0 ~ 50° C (32 ~ 122° F)

PCL-743, PCL-745: 0 ~ 65° C (32 ~ 149° F)

Ordering Information

PCL-740 RS-232/RS-422/RS-485/current-loop serial interface


PCL-741 Iso lat ed dual-port RS-232/current-loop interface card.

PCL-743B 2-port RS-422/485 communication card

PCL-743S 2-port RS-422/485 communication card with EFT

surge protection

PCL-745B 2-port RS-422/485 communication card with isolation


PCL-745S 2-port RS-422/485 communication card with isolation

and EFT Surge Protection

PCL-746+ 4-port RS-232/422/485 communication card

(30cmDB37 to 4 DB25 cable included)

PCL-746+/9 4-port RS-232/422/485 communication card

(30cmDB37 to 4 DB9 cable included)

* 上述商品規格僅供參考,實際規格以實物為準。