4-port High Speed PCL-846/847 RS-422/485 Interface Cards serial ports • Wide IRQ selection: 3, 4, 5, 6, 7, 9, 10, 11, 12 or 15 • Supports standard DOS COM1, COM2, COM3, and COM4 • Supports DOS/Windows 3.1 (PC-ComLIB), Windows 95/ 98, Windows NT (ICOM Utility) • Provides 1000 V isolation (PCL-846A/846B only) DC • Provides 3000 V surge protection (PCL-846B/847B) DC • Space reserved for termination resistors • Supports 2 wire or 4 wire operation • Supports Tx, Rx, RTS, and CTS signals • Automatic RS-485 data flow control or RTS control Specifications • Ports: 4 • UART: 4 x 16C550 with 16-byte FIFO • Speed: 50 ~ 921.6 Kbps Introduction • Parity: none, even, odd PCL-846/847 series cards provide four independent RS- • Signal support: 422/485 serial ports on a card. Each port has a 16C550 TxD+, TxD-, RxD+, RxD-, CTS+, CTS-, RTS+ and RTS- UART with an on-chip 16-byte FIFO buffer for reliable, high- 6 • I/O address: From 200H to 3F8H speed serial I/O. The UART buffers data into 16-byte packets before putting it on the bus. This drastically • IRQ: 3, 4, 5, 6, 7, 9, 10, 11, 12 or 15 reduces the CPU load and avoids data loss when the • Isolation voltage: 1000 V (PCL-846A/846B only) DC system is busy and cannot process the interrupt quickly. • Surge protection: 3000 V (PCL-846B/847B) The UART is especially useful for high speed serial I/O DC under Windows. • Power consumption: +5 V @ 250 mA typical, 500 mA max. PCL-846 cards differ from PCL-847 cards in that they utilize • Cables: 30-cm male DB-37 to four male DB-9 (DTE) on-board optical isolators to protect your PC and • Operating temperature: 0 ~ 60° C (32 ~ 140° F) equipment against damage from ground loops, increasing • Storage temperature: -25 ~ 80° C (-13 ~ 176° F) system reliability in harsh environments. To further increase reliability, PCL-846B/847B cards include surge • Dimensions: 185 mm x 100 mm (7.3" x 3.9") protection technology, protecting your system from abrupt high voltage surges (up to 3000 V) such as those caused Pin Assignment by lightning during thunderstorms. An RS-485 Network with Automatic Data Flow Control Using RS-232 Software The RS-485 mode automatically senses the direction of incoming data and switches its transmission direction accordingly. This feature means your network looks and acts just like an RS-232 network. Application software RS-422 RS-485 written for half duplex RS-232 can be used without modification. Moreover, you can simply and quickly build Ordering Information an RS-485 network with just two wires. q PCL-846A: 4-port RS-422/485 interface card w/isolation protection Features q PCL-846B: 4-port RS-422/485 interface card w/isolation • Four independent RS-422/RS-485 serial ports and surge protection • Transmission speeds up to 921.6 Kbps q PCL-847A: 4-port RS-422/485 interface card q PCL-847B: 4-port RS-422/485 interface card w/surge • Independent/shared IRQ settings between each of the 4 protection Daughterboards and Modules Note: All specifications are subject to change without notice 6- 9 NEW Industrial Communication