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BLS 4221S

ISA 1-Port RS-422/485 Serial Interface Card, 460.8 kbps Data Rate, 16-Byte FIFO Buffer, with DB-9M Connector

Qty   Price (with options selected)
Shipping: 1-2 weeks
 Features
System BusISA (16-bit, AT)
Data Rate per Port, Max.460.8 kbps
Number of RS-422/485 Serial Ports1
 
Introduction

The BLS 4221S is a high-performance RS422/485 card with a 16C550-style UART that features 16-byte transmit and receive buffers to help guard against loss of data in your busy system. The card may be addressed as COM1: to COM4: or any other I/O address you choose from 000 up to 3F8 hex. The backplate has one standard DB-9 male (9-pin) connector.

All ports are capable of operating at speeds up to 460 kbaud simultaneously, making this card ideal for high-speed applications such as ISDN modems.

Interrupt Sharing: The Key to Adding Many Serial Ports

The powerful interrupt feature allows multiple ports on a single card to use the same interrupt. Any of eleven interrupt choices are available for each port. The card is jumper-selectable for compatibility with protocols used by Digi®. This functionality provides drop-in replacement capability at reduced cost. Because each port's address may be defined individually, you don't have to worry about address conflicts the way you would with cards that use 32- and 64-byte blocks for addressing. Our serial cards are compatible with all application software that communicates with a standard serial port using an 8250 or 16C450 UART (the UARTs which virtually all PC's use for serial ports). This includes compatibility with DOS, Windows 3.x/95/98/NT/ME/2000/XP, OS/2, UNIX, and XENIX. RS-232 cards support the standard RS-232 interface and all the above mentioned features; they're DTE/DCE selectable so no special cables are required. Each port supports all handshake and modem control lines, including: TXD, RXD, RTS, CTS, DSR, DCD, DTR, and RI.

Drivers are automatically and instantly disabled (and receivers enabled) after transmission of the stop bit. Drivers and receivers may also be controlled with data bits 0 and 1 by writing to the base address+7 for the port (MetraByte COM-485 protocol compatible). RTS and CTS flow control is supported as well. Convenient on-board jumpers allow for 220-ohm termination as needed for each driver and receiver.

  Detailed Specifications  More Detail
Product Information
System Bus ISA (16-bit, AT)
Data Rate per Port, Max. 460.8 kbps
FIFO Buffer Length 16 Bytes
I/O Ports
Serial Ports UART/Controller Type 16550-compatible
Number of RS-422/485 Serial Ports 1
Detailed Specifications More Detail
 
Ordering - Includes Options Indicated Below
BLS 4221S
ISA 1-Port RS-422/485 Serial Interface Card, 460.8 kbps Data Rate, 16-Byte FIFO Buffer, with DB-9M Connector
$99.00
Catalog # Shipping Price (with options) Qty  
BLS 4221S 1-2 weeks
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