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Part# 3055

(Ultra-485)

ISA 1-Port RS-422, RS-485 Serial Interface


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THIS PRODUCT IS OBSOLETE DUE TO LACK OF COMPONENT AVAILABILITY. PLEASE CONTACT YOUR SALES REPRESENTATIVE FOR FURTHER INFORMATION AND NEW PRODUCT ALTERNATIVES.

The 3055 ISA serial interface card provides a single RS-422 or RS-485 port for connection to serial devices. Individually selectable addresses and extended "AT" interrupts allow for seamless integration into OS/2 and Windows systems. The ULTRA 485's "auto enable" design eliminates RS-485 communications roadblocks under Windows and OS/2. The ULTRA 485 appears to the host system as a standard COM: port requiring no special drivers or additional software. For user's that require custom baud rates, isochronous communications, or 9-bit protocol, the 3055 ISA serial interface is available with the Oxford 16C950 UART, part number 3055-SN.
Host Interface(s) ISA
# of Ports 1
Electrical Interface RS-422, RS-485
UART Series 550 UART
Serial Connector(s) DB25M
Communications Chip 16550
Max Data Rate 115.2K bps
Max Data Distance 4000 feet
RS-485 Operation Full Duplex (4 wire)
Half Duplex (2 wire)
Humidity Range 10 - 90% Relative Humidity, Non-Condensing
• Automatic control of RS-485 driver enable signal
• Selectable COM: port addresses
• Selectable and shareable IRQ level (2-5, 7, 10-12 and 15)
• Automatically handles RS-485 enable and disable






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