©Sealevel Systems, Inc.
SL9249 – 12/2013
7802e Manual
3
Introduction
The Sealevel COMM+8.422.PCIe
(Item# 7802e) provides a PCI Express 1.0a compliant interface
adapter with eight asynchronous serial ports for industrial automation and control applications.
The serial ports are field selectable for RS-422 or RS-485 and support data rates to 921.6 Kbps.
RS-422 mode for is designed for long distance device connections up to 4000ft. where noise
immunity and high data integrity are essential. RS-485 mode can capture data from multiple
peripherals in an RS-485 multi-drop network. Up to 31 unit load RS-485 devices can be
connected to each port to automate your data collection. You can even mix the ports in any of
the interface combinations to provide maximum flexibility to your application.
In RS-485 mode, the transmitter is automatically enabled in hardware, eliminating the need for
application software control. This allows the 7802e to be used with standard serial
communications applications and removes the risk of bus contention and data corruption. The
Sealevel SeaCOM software driver and utilities make installation and operation easy XP, Vista,
Windows 7, and Windows 8 operating systems.
The 7802e ships with a low profile PC bracket for use in systems with a low profile PCI Express
slot. If you need a standard size PC bracket, order the 7802eS.
PCI Express eight-port serial interface adapter
Each port individually configurable for RS-422 or RS-485
High performance OXPCIe954 UART with 128-byte FIFOs
Each port supports data rates to 921.6K bps
Oscillator and clock prescaler support wide range of baud rates
Supports 9-bit protocol framing
PCI Express 1.0a compliant via X1 connector
Compatible with all low profile and standard size PCI Express slots
Includes 36” cable that terminates to eight DB9M connectors
Automatic RS-485 enable/disable
