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© Sealevel Systems, Inc. 7402e Manual | SL9251 11/2022
Introduction
The Sealevel COMM+2.422.PCIe
(Item# 7402e) provides a PCI Express 1.0a compliant interface adapter
with four 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 RS485
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 7402e to be used with standard serial communications applications and
removes the risk of bus contention and data corruption.
The 7402e 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 7402eS.
Features
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PCI Express four-port serial interface adapter
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Each port individually configurable for RS-422 or RS-485
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High performance OXPCIe954 UART with 128-byte FIFOs
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Each port supports data rates to 921.6K bps
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Oscillator and clock prescaler support wide range of baud rates
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Supports 9-bit protocol framing
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PCI Express 1.0a compliant via x1 connector
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Compatible with all low profile and standard size PCI Express slots
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Includes 36” cable that terminates to four DB9M connectors (Item# CA200)
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Automatic RS-485 enable/disable