SeaLevel Ultra-COMM+2/422.PCIe Manual de usuario
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© Sealevel Systems, Inc. 7204e Manual | SL9244 11/2022
Ultra-COMM+2/422.PCIe
User Manual | 7204e and 7204eS
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© Sealevel Systems, Inc. 7204e Manual | SL9244 11/2022
Contents
CONTENTS...........................................................................................................................................................2
INTRODUCTION ................................................................................................................................................... 3
BEFORE YOU GET STARTED ...............................................................................................................................4
HARDWARE DESCRIPTION ................................................................................................................................. 6
TECHNICAL DESCRIPTION ................................................................................................................................. 7
HARDWARE CONFIGURATION..........................................................................................................................11
SOFTWARE INSTALLATION..............................................................................................................................15
HARDWARE INSTALLATION .............................................................................................................................17
HARDWARE REMOVAL......................................................................................................................................24
TECHNICAL SPECIFICATIONS..........................................................................................................................25
APPENDIX A – TROUBLESHOOTING................................................................................................................26
APPENDIX B – HANDLING INSTRUCTIONS.....................................................................................................31
APPENDIX C – ELECTRICAL INTERFACE ........................................................................................................32
APPENDIX D – ASYNCHRONOUS COMMUNICATIONS ..................................................................................33
APPENDIX E – MECHANICAL DRAWING .........................................................................................................34
WARRANTY ........................................................................................................................................................35
................................................................................................................................................................................
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© Sealevel Systems, Inc. 7204e Manual | SL9244 11/2022
Introduction
The Sealevel Ultra-COMM+2.422.PCIe (Item# 7204e) provides a PCI Express 1.0a compliant interface
adapter with two 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 921.6K bps.
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 7204e 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 7204e 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 7204eS.
Features
•PCI Express two-port serial interface
adapter
•Each port configurable for RS-422 or RS-
485
•High performance 16C950 UART with
128-byte FIFOs
•Each port supports data rates to 921.6K
bps
•Oscillator and clock prescalar 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 two
DB9M connectors
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© Sealevel Systems, Inc. 7204e Manual | SL9244 11/2022
Before You Get Started
What’s Included
Depending on the PC bracket ordered, the 7204e is shipped with the following items. If any of these items
are missing or damaged, please contact Sealevel for replacement.
•Ultra-COMM+2.422.PCIe – Two-Port 422/485 Serial Interface
7204e – PCI Express Board with Low Profile PC Bracket
7204eS – PCI Express Board with Standard Height PC Bracket
•CA203 – DB25F to (2) DB9M Cable, 36” in Length
Advisory Conventions
Warning
The highest level of importance used to stress a condition where damage could result to the
product, or the user could suffer serious injury.
Important
The middle level of importance used to highlight information that might not seem obvious or a
situation that could cause the product to fail.
Note
The lowest level of importance used to provide background information, additional tips, or other
non-critical facts that will not affect the use of the product.
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© Sealevel Systems, Inc. 7204e Manual | SL9244 11/2022
Optional Items
Depending upon your application, you are likely to find one or more of the following items useful with the
7204e. All items can be purchased from our website (www.sealevel.com) by calling our Sales team at +1
864-843-4343.
DB9F to DB9M Extension Cable (Item# CA127)
The CA127 allows users to extend a DB9 cable up to
six feet. The connectors are pinned one-to-one, so the
cable is compatible with any device or cable that has
DB9 connectors.
DB9F to RJ45 Modular Adapter (Item# RJ9S8)
The RJ9S8 is a DB9 female to RJ45 adapter. It can be
configured without tools and is an excellent choice for
using available infrastructure wiring.
Terminal Block DB9 Female to 5 Screw Terminals
(Item # TB34)
The TB34 terminal block adapter offers a simple
solution for connecting RS-422 and RS-485 field
wiring to a serial port. The terminal block is
compatible with 2-wire and 4-wire RS-485 networks
and matches the RS-422/485 pin-out on Sealevel
serial devices with DB9 male connectors.
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© Sealevel Systems, Inc. 7204e Manual | SL9244 11/2022
Hardware Description
PCI Express Board
The 7204e is a low profile PCI Express 1.0a compliant board via single lane x1 slot. It can be used in any
single- or multi-lane PCI Express slot. It is available in standard height PCI Express as item# 7204eS.
DB25M Board Connector
The board integrates a DB25 male connector for interfacing the two serial ports via the included cable.
DB25M Serial Connectors
The 7204e ships with a two-port cable (Item# CA203) that includes four DB9 male serial connectors. The
pin out for these connectors is detailed in the following Technical Description section.
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© Sealevel Systems, Inc. 7204e Manual | SL9244 11/2022
Technical Description
Each serial port utilizes a 16C950 UART featuring programmable baud rates, data format, interrupt control
and industry-leading 128-byte transmit and receive FIFOs. This high-performance UART includes 9-bit
framing support and is fully software compatible with legacy 16550 applications. In addition, the 14.7456
oscillator and UART’s flexible clock prescaler supports the widest range of standard and non-standard baud
rates to 921.6K bps. Refer to Appendix C for cable length limitations.
Connector Pin Assignments
Board Connector (DB25 Male)
The 7204e board includes a DB25 male connector for attaching the included cable (Item# CA203). The pin
out for the DB25M connector is shown in the table below.
Port 1 Pin# Port 2 Pin# RS-422/485
1 11 RD –
2 12 CTS –
3 13 RD +
4 14 TD –
5 15 RTS –
6 16 RTS +
7 17 TD +
8 18 CTS +
9 10 GND
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© Sealevel Systems, Inc. 7204e Manual | SL9244 11/2022
Cable Pin Assignments
The 7204e includes a cable (Item# CA203) with a DB25 female connector terminating to a pair of DB9 male
connectors. The DB25F connector on the cable plugs into the DB25M connector on interface board. The
DB9M connectors are compatible with a variety of serial peripherals. The pin assignments for the supported
electrical interfaces are shown in the tables below.
RS-422 & RS-485 (DB9 Male)
Pin # Signal Name Mode
1 RX + Receive Data Positive Input
2 RX – Receive Data Negative Input
3 TX – Transmit Data Negative Output
4 TX + Transmit Data Positive Output
5 GND Ground
6 RTS + Request to Send Positive Output
7 RTS – Request to Send Negative Output
8 CTS – Clear to Send Negative Input
9 CTS + Clear to Send Positive Input
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© Sealevel Systems, Inc. 7204e Manual | SL9244 11/2022
Baud Rates and Oscillator Value
The 7204e utilizes a 14.7456MHz oscillator, which is automatically entered by the SeaCOM driver under
Windows 2000/XP/Vista/7 operating systems. The oscillator value can be found in the COM port properties
of Device Manager under the ‘Advanced Tab’.
The high-speed oscillator and the UART’s flexible clock prescaler support a wide range of standard and
non-standard baud rates. You simply need to select the appropriate baud rate in your communications
software and the driver will calculate the closest matching baud rate.
The following table shows common baud rates, and the baud rates you need to select in your application
running on operating systems other than Windows.
For this Data Rate Choose this Data Rate
1200 bps 150 bps
2400 bps 300 bps
4800 bps 600 bps
9600 bps 1200 bps
19.2K bps 2400 bps
38.4K bps 4800 bps
57.6K bps 7200 bps
115.2 K bps 14.4K bps
230.4K bps 28.8K bps
460.8K bps 57.6 K bps
921.6K bps 115.2 K bps
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© Sealevel Systems, Inc. 7204e Manual | SL9244 11/2022
If your communications package allows the use of baud rate divisors, choose the appropriate
divisor from the following table:
For this Data Rate Choose this Divisor
1200 bps 768
2400 bps 384
4800 bps 192
9600 bps 96
19.2K bps 48
38.4K bps 24
57.6K bps 16
115.2K bps 8
230.4K bps 4
460.8K bps 2
921.6K bps 1
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