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Technical Description
The Sealevel ACB-ULTRA.LPCIe (Item# 5104e) is a PCI Express 1.0a compliant interface adapter with a
single channel high-speed multi-protocol serial interface suitable for the most popular communication
protocols. This sync/async card provides an ideal solution for high-speed applications including LAN/WAN
connectivity. Utilizing the Zilog Z16C32 (IUSC™) on chip DMA controller eliminates bus bandwidth
constraints that are placed on typical interface adapters, allowing data rates to reach 10Mbps in burst
mode. By utilizing the Z16C32's 32 byte FIFO buffer coupled with 256KB of onboard memory, higher data
rates are achieved.
Z16C32 IUSC™
The ACB-ULTRA.LPCIe is based on a single Zilog Z16C32 IUSC (Integrated Universal Serial Controller). The
IUSC has a built-in DMA controller that allows high-speed data transfers directly to and from the 256KB
block of on-board memory. The IUSC's built-in DMA controller supports 4 different modes of DMA transfer:
Single Buffer, Pipelined, Array, and Link List.
RAM
The ACB-ULTRA.LPCIe provides 256KB of onboard memory.
Interface Selection
The ACB-ULTRA.LPCIe supports a variety of electrical interfaces: RS-232, RS-422/449, EIA-530, V.35 and
RS-485. There is line termination on RXD, RXC, and TXC in the following modes: RS-530, RS-530A, RS-485T,
and V.35.
Clocking
The ACB-ULTRA.LPCIe has an on-board 20MHz oscillator that clocks the IUSC. Other oscillator frequencies
may be specified, via factory configuration: contact Sealevel for more information on this option.
OEM Security Feature (Option)
The ACB-ULTRA.LPCIe supports an OEM Security Feature, via factory configuration: contact Sealevel for
more information on this option.
25 Pin Connector Signal Layouts (DB-25 Male)
In all modes, Pin 1 has a 1K ohm resistor to GND and pin 25 has a 1K ohm resistor to +5V connection. This
is useful for RS-485 biasing. If this presents a problem in your implementation, please contact Sealevel for
aid in removing these or to inquire about an alternate factory configuration.
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© Sealevel Systems, Inc.
5104e & 5104es Manual | SL9273 8/2021
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