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AC40-FIBER OPTIC
REPEATER/ADAPTER
USER’S GUIDE
Form 526-001009 — October, 2000
43044 Business Park Drive, Temecula, CA 92590-3614
Phone: 800-321-OPTO (6786) or 951-695-3000
Fax: 800-832-OPTO (6786) or 951-695-2712
www.opto22.com
Product Support Services:
800-TEK-OPTO (835-6786) or 951-695-3080
Fax: 951-695-3017
E-mail: support@opto22.com
Web: support.opto22.com
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AC40-Fiber Optic Repeater/Adapter User’s Guide
Form 526-001009 — October, 2000
All rights reserved.
Printed in the United States of America.
The information in this manual has been checked carefully and is believed to be accurate; however, Opto 22 assumes
no responsibility for possible inaccuracies or omissions. Specifications are subject to change without notice.
Opto 22 warrants all of its products to be free from defects in material or workmanship for 30 months from the
manufacturing date code. This warranty is limited to the original cost of the unit only and does not cover
installation, labor, or any other contingent costs. Opto 22 I/O modules and solid-state relays with date codes of
1/96 or later are guaranteed for life. This lifetime warranty excludes reed relay, SNAP serial communication
modules, SNAP PID modules, and modules that contain mechanical contacts or switches. Opto 22 does not warrant
any product, components, or parts not manufactured by Opto 22; for these items, the warranty from the original
manufacturer applies. These products include, but are not limited to, the OptoTerminal-G70, OptoTerminal-G75,
and Sony Ericsson GT-48; see the product data sheet for specific warranty information. Refer to Opto 22 form
number 1042 for complete warranty information.
Opto 22 FactoryFloor, Cyrano, Optomux, and Pamux are registered trademarks of Opto 22. Generation 4, ioControl,
ioDisplay, ioManager, ioProject, ioUtilities, mistic, Nvio, Nvio.net Web Portal, OptoConnect, OptoControl,
OptoDisplay, OptoENETSniff, OptoOPCServer, OptoScript, OptoServer, OptoTerminal, OptoUtilities, SNAP Ethernet I/O,
SNAP I/O, SNAP OEM I/O, SNAP Simple I/O, SNAP Ultimate I/O, and SNAP Wireless LAN I/O are trademarks of
Opto 22.
ActiveX, JScript, Microsoft, MS-DOS, VBScript, Visual Basic, Visual C++, and Windows are either registered
trademarks or trademarks of Microsoft Corporation in the United States and other countries. Linux is a registered
trademark of Linus Torvalds. Unicenter is a registered trademark of Computer Associates International, Inc. ARCNET
is a registered trademark of Datapoint Corporation. Modbus is a registered trademark of Schneider Electric.
Wiegand is a registered trademark of Sensor Engineering Corporation. Nokia, Nokia M2M Platform, Nokia M2M
Gateway Software, and Nokia 31 GSM Connectivity Terminal are trademarks or registered trademarks of Nokia
Corporation. Sony is a trademark of Sony Corporation. Ericsson is a trademark of Telefonaktiebolaget LM Ericsson.
All other brand or product names are trademarks or registered trademarks of their respective companies or
organizations.
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Table of Contents
Welcome ................................................................................................... 5
Document Conventions ....................................................................................................5
Introduction .............................................................................................. 7
Disassembly ..................................................................................................................8
Mounting......................................................................................................................9
Power Wiring ............................................................................................................ 10
RS-485 Connection ..................................................................................................11
RS-485 Wiring Examples ....................................................................................... 12
Fiber Optic Connection ........................................................................................... 13
Jumpering.................................................................................................................. 14
Reassembly ................................................................................................................ 15
LED’s/Diagnostics ...................................................................................................... 16
Dimensions ........................................................................................................................ 16
Specifications.................................................................................................................... 17
Cable and Connector Manufacturers .................................................................. 18
Distributor of Fiber Optic Cables, Connectors, and Accessories .................... 18
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Welcome
Document Conventions
• Bold typeface indicates text to be typed. Unless otherwise noted, such text may be
entered in upper or lower case. (Example: “At the DOS prompt, type cd \windows.”)
• Italic typeface indicates emphasis and is used for book titles. (Example: “See the
OptoControl User’s Guide for details.”)
• File names appear in all capital letters. (Example: “Open the file TEST1.TXT.”)
• Key names appear in small capital letters. (Example: “Press
• Key press combinations are indicated by plus signs between two or more key names.
For example,
releasing the F1 key. Similarly, CTRL+ALT+DELETE is the result of pressing and holding the
CTRL and ALT keys, then pressing and releasing the DELETE key.
• “Press” (or “click”) means press and release when used in reference to a mouse button.
• Menu commands are sometimes referred to with the Menu➝Command convention.
For example, “Select File➝Run” means to select the Run command from the File menu.
• Numbered lists indicate procedures to be followed sequentially. Bulleted lists (such as
this one) provide general information.
SHIFT+F1 is the result of holding down the SHIFT key, then pressing and
SHIFT.”)
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Introduction
Industrial automation often requires reliable communications between equipment sites separated by long distances
or harsh electrical environments. The AC40 fiber optic data link adapter satisfies the requirements of industrial
communications by using light instead of conventional electrical signals. The fiber optic data link between two
pieces of equipment is electrically isolated and completely immune to electrical noise.
The AC40 has three I/O ports; the RS-485 port, the host fiber port, and the repeater fiber port. When operating, the
AC40 passes and amplifies all signals between the host and repeater fiber port. All signals from the host fiber port
receiver are transmitted out the RS-485 port, and any signals received at the RS-485 port are transmitted out the
host fiber port.
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Disassembly
The AC40 must be disassembled to access the mounting hardware, power and communications connectors. The
case is opened by turning the two captive screws on the top of the AC40 counter clockwise.
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Mounting
The AC40 is normally mounted in the bottom left corner of a Mistic panel. The bottom case half has two captive #10
screws for mounting.
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Power Wiring
The AC40 has 3 different power supply options. The AC40A has a 120 VAC power requirement; the AC40B has a 240
VAC power requirement; and the AC40C has a 10 - 28 VDC power requirement. The power wires are routed to the
power connector block on the lower PC board. The power wiring should be run along the left side of the case half.
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RS-485 Connection
The AC40 supports two connection methods for the RS-485 port. The primary connection is through the 5 position
screw terminal block located on the lower edge of the elevated printed circuit board. The optional connection
method is through the 10 position male header connector labeled P1. The optional connection method allows for
easy hook-up to Mistic remote panels using the flat 10-pin twisted pair cable found in a G4RCOMMKIT.
When connecting to the 5 position screw terminal block, the option of 2-wire or 4-wire hook-up is available. * The
10-pin header can only operate in 2-wire hook-up. When the 5 position screw terminal block is set to 2-wire
operation, use the TX + and TX - terminals.
NOTE:
The AC40 does not support the interrupt capability of remote bricks.
* Jumpering information is on page 14.
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RS-485 Wiring Examples
NOTE:
When only one panel of remote bricks is attached to the AC40, use the 10-pin header.
* Jumpering information is on page 14.•
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Fiber Optic Connection
The fiber optic connectors on the AC40 are ‘ST’ style female. The ‘ST’ male is inserted and the outer barrel rotated
until the posts on the female connector lock in place. This connection is simple and reliable.
The AC40 is optimized to operate with 62.5 mm/125 mm fiber cable. It is possible to use other fiber diameters,
however, the performance specifications fall off rapidly.
After the fiber connections are in place, use cable ties to secure the fiber cables.
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Jumpering
A group of 8 jumpers labeled A1 - A8 are located on the left-hand side of the upper printed circuit board in the AC40.
The jumpers are inserted to configure the AC40 RS-485 port. Jumpers A1 - A6 select various possibilities for bias
and termination of the RS-485 link. Jumpers A7 and A8 are used to select 2-wire or 4-wire mode.
Mode Install Jumpers
2-wire Terminated/Not Biased A2, A7, A8
2-wire Unterminated A7, A8
2-wire Terminated/Biased A1, A2, A3, A7, A8
4-wire Unterminated No Jumpers
4-wire Terminated/Biased A1, A2, A3, A4, A5, A6
4-wire Terminated/Not Biased A2, A5
When you configure your AC40 RS-485 communications link, keep these facts in mind:
(AC40 is shipped with
these jumpers installed.)
• RS-485 requires termination at
both ends of the communications wiring.
• The link must be biased in one place only.
• Opto 22 remote Bricks have no bias or termination options.
• The G4TERMR terminator does not have bias options.
• When G4LC32 RS-485 serial ports are terminated, they are automatically biased.
• Biasing is usually done at the “HOST” end.
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Reassembly
After all connections and jumpering is complete, the AC40 can be reassembled. It is important that all wires are
routed so they will not be pinched by the case top. After case top has been placed on top of the case bottom, start
both thumbscrews. Do not tighten the thumbscrews until both have been started! Tighten thumbscrews to finish
assembly.
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LED’s/Diagnostics
When power is applied to the AC40, the green LED labeled PWR should glow. If it does not - check voltage and
polarity of input power.
When the LED labeled RX is illuminated, data is being received from the host fiber port and transmitted down the
RS-485 port and the repeater fiber port.
When the LED labeled TX is illuminated, data is being received from either the repeater fiber port or the RS-485 port
and transmitted down the host fiber port.
The most common start-up problems on the AC40 are:
• Receive and Transmit fiber optic cables are swapped.
• The RS-485 port is incorrectly jumpered. Check:
(a) 2-wire or 4-wire option
(b) termination at both ends
(c) biasing at one place only
• The RS-485 port is incorrectly wired. Check:
(a) polarity of signals
(b) twisted pair cable must be used
Dimensions
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Specifications
Ambient Temperature:
Power:
AC40B:
Fiber Optic:
Recommended Fiber Size:
Recommended Fiber:
"ST" Style Connectors:
Maximum Fiber Length: 3.5 kilometers
Transmitter Characteristics (All Typical)
Optical Power Output:
Numerical Aperture:
Optical Port Diameter:
Receiver Characteristics (All Typical)
Receiver Sensitivity: -24.0 dBm
RS-485:
Maximum Cable Length:
Recommended Cable Type
(twisted pair):
Termination Resistance: 220 ohms
Tri-state Biasing Resistance: 470 ohms
Features:
* Asynchronous operation independent of baud rate, parity, or stop bits
* Baud rates to 115.2K baud
* Jumpers for optional termination and biasing
* Up to 32 AC40•s per fiber link
0° C - 70° C
95% relative humidity, non-condensing
120 VAC ± 10 VAC 60 Hz
240 VAC ± 20 VAC 50 Hz
10 - 28 VDC - 750 mA
62.5/125 µm
Belden Type 225812 (Duplex)
Belden Type 225811 (Single)
-12.0 dBm
0.31
150 µm
0.50
400 µm
4,000 feet
100 ohms impedence
12.5 picofarads per foot
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Cable and Connector Manufacturers
Belden Wire And Cable
P. O. Box 1980
Richmond, IN 47375
800/235-3361
Model: 62.5/125 Single - 225811
62.5/125 Duplex - 225812
AT&T Network Systems
505 No. 51st. Avenue
Phoenix, AZ 85043
800/344-0223
Hewlett-Packard
3003 Scott Blvd.
Santa Clara, CA 95054
408/988-7000
Distributor of Fiber Optic Cables, Connectors, and Accessories
Fibertron
1405 E. Orangethorpe Avenue
Fullerton, CA 92631
714/871-3344
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