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Introducing the RS-232 to 422/485
The RS-232 to 422/485 Converter allows RS-232 line signal
to be directly converted to RS-422 or RS-485 standard.
Features and Benefits
• Low cost
• Easy install
• Supported baud rate up to 115.2 K bps
• 15KV ESD protection
• Supports half-duplex or full-duplex
System Requirements
• Pentium
®
II or equivalent PC
• Windows
®
2000 and above
Package Contents
• RS-232 to 422/485 Converter
• DB9 to DB9 cable
• Quick Installation Guide
Serial Number Sticker
For future product return or exchange, this serial number
is require. Please keep it for your reference.
04-0483A
RS-232 to 422/485 Converter
Quick Installation Guide
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Layout
Figure 1: Layout
DC Jack input
+5VDC
RS422/485
Signal to
Target Device
Transiting
indicate LED
RS232 signal
from host
Note: Do not connect external DC-Jack and screw
terminal DC input simultaneously.
Hardware structure
Figure 2
HALF
FULL
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Hardware Installation
Connect the power source or use standard RS232 (TXD,
RXD, DTR, DSR, CTS, RTS, GND)
Note: Connect the power source only. Do not use
the external DC-Jack and scress terminal input
simultaneously.
Figure 3
Figure 4
Connecting RS-232 to 422/485 Converter with
host PC
Connecting RS-232 to 422/485 Converter with
RS485 serial device
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Figure 5
Figure 6
Connecting RS-232 to 422/485 Converter with
RS422 serial device
Loop back test
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Figure 7
Terminal Resistor connection
RS-232 to 422/485 Converter does not have a built-in
terminal resistor, user may add external terminal resistor
by following connection
Terminal Resistor specification
110 ohm: If distance between both end of RS485 devices
in 1.2KM .
220 ohm: If distance between both end of RS485 devices
in 600M .
330 ohm: If distance between both end of RS485 devices
in 300M
RS-485
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RS-422
Figure 8
Terminal Resistor specification
110 ohm: If distance between both ends of RS422 devices
in 1.2KM.
220 ohm: If distance between both ends of RS422 devices
in 600M.
330 ohm: If distance between both ends of RS422 devices
in 300M.
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Technical Support and Warranty
QUESTIONS? SIIG’s Online Support has answers! Simply visit our
web site at www.siig.com and click Support. Our online support
database is updated daily with new drivers and solutions. Answers
to your questions could be just a few clicks away. You can also submit
questions online and a technical support analysts will promptly
respond.
SIIG offers a 5-year manufacturer warranty with this product. Please
see our web site for more warranty details. If you encounter any
problems with this product, please follow the procedures below.
A) If it is within the store's return policy period, please return the
product to the store where you purchased from.
B) If your purchase has passed the store's return policy period, please
follow these steps to have the product repaired or replaced.
Step 1: Submit your RMA request.
Go to www.siig.com, click Support, then RMA to submit a
request to SIIG RMA. If the product is determined to be
defective, an RMA number will be issued.
Step 2: After obtaining an RMA number, ship the product.
• Properly pack the product for shipping. All software, cable(s)
and any other accessories that came with the original package
must be included.
• Clearly write your RMA number on the top of the returned
package. SIIG will refuse to accept any shipping package, and
will not be responsible for a product returned without an
RMA number posted on the outside of the shipping carton.
• You are responsible for the cost of shipping. Ship the product
to the following address:
SIIG, Inc.
6078 Stewart Avenue
Fremont, CA 94538-3152, USA
RMA #:
• SIIG will ship the repaired or replaced product via Ground
in the U.S. and International Economy outside of the U.S. at
no cost to the customer.
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RS-232 to 422/485Converter is a trademark of SIIG, Inc. SIIG and the SIIG logo are registered
trademarks of SIIG, Inc. Microsoft, Windows and Windows Vista are either registered trademarks or
trademarks of Microsoft Corporation in the United States and/or other countries. Pentium is a
registered trademark of Intel Corporation. Other names used in this publication are for identification
only and may be trademarks of their respective companies.
June, 2008 Copyright © 2008 by SIIG, Inc. All rights reserved.
About SIIG, Inc.
Founded in 1985, SIIG, Inc. is a leading computer upgrade manufacturer
of I/O connectivity products, including PCIe, PCI & ISA serial and
parallel ports, USB, Serial ATA & UltraATA controllers, FireWire
(1394a/b), networking, sound cards, and other accessories. SIIG is the
premier one-stop source of upgrades.
SIIG products offer comprehensive user manuals, many user-friendly
features, and are backed by an extensive manufacturer warranty.
High-quality control standards are evident by the overall ease of
installation and compatibility of our products, as well as one of the
lowest defective return rates in the industry. SIIG products can be
found in computer retail stores, mail order catalogs, through major
distributors, system integrators, and VARs in the Americas and the
UK, and through e-commerce sites.
PRODUCT NAME
RS-232 to 422/485 Converter
FCC RULES: TESTED TO COMPLY WITH FCC PART 15, CLASS
B OPERATING ENVIRONMENT: FOR HOME OR OFFICE USE
FCC COMPLIANCE STATEMENT:
This device complies with part 15 of the FCC Rules. Operation is
subject to the following two conditions: (1) This device may not cause
harmful interference, and (2) this device must accept any interference
received, including interference that may cause undesired operation.
THE PARTY RESPONSIBLE FOR PRODUCT COMPLIANCE
SIIG, Inc.
6078 Stewart Avenue
Fremont, CA 94538-3152, USA
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