©Sealevel Systems, Inc.
7404e Manual
3
SL9224 02/2017
Introduction
The Sealevel Ultra COMM+4.PCIe is an four channel RS-232/485/422 PCI express Bus serial I/O
adapter supporting data rates up to 921.6Kbps.
The RS-232 compatibility allows for connection to devices utilizing the RS-232 electrical
interface, such as modems, data-entry terminals, and plotters.
RS-422 provides excellent communications for long distance device connections up to 4000ft.,
where noise immunity and high data integrity are essential.
RS-485 is optimized for ‘Multi-Drop’ or ‘Party-line’ operations selecting data from multiple
peripherals (as many as 31 devices can be connected on an RS-485 bus).
In RS-485 mode, our special auto-
enable feature allows the RS485 ports to be viewed by the
operating system as a COM: port. This allows the software application to utilize the serial port
for RS
485 communication
without the need to control the direction of data between the master
and slave device. Our on-board hardware automatically handles the RS-485 driver enable.
The Ultra COMM+4.PCIe will operate on x1, x4, x8 or x16 PCIe Bus slots.
Features
•
Each port individually configurable for RS-232, RS-422, or RS-485
•
16C954 buffered UARTs with 128-byte FIFOs
•
Oscillator and clock prescalar support wide range of baud rates
•
Supports 9-bit protocol framing
•
Each port supports data rates to 921.6K bps
•
RS-485 line termination, pull-up and pull-down resistors for each port are selectable via
dipswitch
•
RS-485 ECHO can be enabled/disabled via dipswitch
•
PCI Express x1 compliant
•
Compatible with all standard size PCI Express slots
•
All modem control signals implemented in RS-232 mode
•
Automatic RS-485 enable/disable in hardware
•
Included 36" cable terminates to four DB9M connectors (Item# CA143)
