The Sealevel Systems ACB-ULTRA.LPCI is a low-profile PCI synchronous serial interface card delivering single-port, multi-protocol serial communication for industrial automation, telecommunications, and timing-critical applications. Built around the Zilog Z16C32 IUSC with 256 KB onboard memory and 32-byte FIFO buffering, this adapter achieves data rates up to 10 Mbps in burst mode (RS-422/485) and 20 kbps for RS-232. The integrated DMA controller supports Single Buffer, Pipelined, Array, and Link List transfer modes, accommodating HDLC/SDLC, Bi-sync, Mono-sync, PPP, Frame Relay, X.25, and raw asynchronous protocols.
– Technical Specifications
• Communications Chip: Zilog Z16C32 IUSC
• Memory: 256 KB onboard; 32-byte FIFO buffer
• Clock Source: 20 MHz onboard oscillator (alternative frequencies available via factory configuration)
• Data Rate: 10 Mbps burst (RS-422/485); 20 kbps (RS-232)
• DMA Modes: Single Buffer, Pipelined, Array, Link List
• Serial Connector: DB25
• Distance Rating: 50 feet (RS-232), 4000 feet (RS-485)
– Key Features
• Universal Bus adapter compatible with +5V or +3.3V PCI slots
• On-board line termination for RXD, RXC, TXC in RS-530, RS-530A, RS-485T, V.35 modes
• RS-485 biasing (Pin 1: 1 kΩ to GND; Pin 25: 1 kΩ to +5V; removable if required)
• Modem control signal support for RS-232 compatibility
• Electrical interfaces: RS-232, RS-422, RS-485, RS-530, RS-530A, V.35
• MD1 Low Profile form factor; standard height bracket included/available
– Typical Applications
Industrial automation, point-to-point serial links, frame relay networks, X.25 packet switching, PPP dial connectivity, and synchronous protocol implementations requiring deterministic timing and extended transmission distances.
– Compatibility & Integration
Compliant with PCI Bus Specification Revision 2.2/2.3; requires one available PCI slot and one IRQ allocation. SeaMAC device drivers required (Linux and Windows versions available; legacy OS support via direct contact with Sealevel).
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