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Opto 22 • 43044 Business Park Drive • Temecula, CA 92590-3614 • Phone: (951) 695-3000 • (800) 321-OPT O • Fax: (951) 695-3095 • www.opto22.com
Inside Sales: (800) 321-OPTO • Product Support: (800)TEK-OPTO • (951) 695-3080 • Fax: (951) 695-3017 • E-mail: sales@opto22.com
The AC40 is a fiber optic repeater designed to allow RS-485
communication devices to communicate over a fiber optic data link. AC40
has a host fiber optic port, a repeater fiber link port, and an RS-485 port.
A daisy chain of AC40’s connected by fiber optic cable provides complete
electrical isolation and high baud rates over very long distances.
Description
Part
Numbers Description
AC40A Fiber Optic Repeater-120 VAC
AC40B Fiber Optic repeater-240 VAC
INTERFACES
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Opto 22 • 43044 Business Park Drive • Temecula, CA 92590-3614 • Phone: (951) 695-3000 • (800) 321-OPT O • Fax: (951) 695-3095 • www.opto22.com
Inside Sales: (800) 321-OPTO • Product Support: (800)TEK-OPTO • (951) 695-3080 • Fax: (951) 695-3017 • E-mail: sales@opto22.com
AC40 Specifications
AC40 Architecture
Specifications
Fiber Optics
3.5 Kilometer Distance Between AC40's
ST Style Connectors/Duplex Cable
Optimized for 62.5/125 mm Cable
RS-485
3,000 Feet Twisted Pair Wiring
2-wire or 4-wire Hook-up
Asynchronous Operation Independent
of Baud Rate, Parity or Stop Bits
300–115.2 KB
Jumpers for Termination and Biasing
The host fiber port on the first AC40 must be connected to the host fiber port on the next AC40. All others are connected host to repeater
of the previous AC40.
INTERFACES
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Form 521-070823
DATA SHEET
page 3/14
Opto 22 • 43044 Business Park Drive • Temecula, CA 92590-3614 • Phone: (951) 695-3000 • (800) 321-OPT O • Fax: (951) 695-3095 • www.opto22.com
Inside Sales: (800) 321-OPTO • Product Support: (800)TEK-OPTO • (951) 695-3080 • Fax: (951) 695-3017 • E-mail: sales@opto22.com
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 ports. 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.
NOTE: Signals are not passed from the repeater fiber port to the RS-485 port nor are they passed from the RS-
485 port to the repeater port.
INTERFACES
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Form 521-070823
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Opto 22 • 43044 Business Park Drive • Temecula, CA 92590-3614 • Phone: (951) 695-3000 • (800) 321-OPT O • Fax: (951) 695-3095 • www.opto22.com
Inside Sales: (800) 321-OPTO • Product Support: (800)TEK-OPTO • (951) 695-3080 • Fax: (951) 695-3017 • E-mail: sales@opto22.com
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 counterclockwise.
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Form 521-070823
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Opto 22 • 43044 Business Park Drive • Temecula, CA 92590-3614 • Phone: (951) 695-3000 • (800) 321-OPT O • Fax: (951) 695-3095 • www.opto22.com
Inside Sales: (800) 321-OPTO • Product Support: (800)TEK-OPTO • (951) 695-3080 • Fax: (951) 695-3017 • E-mail: sales@opto22.com
MOUNTING
The bottom case half has two captive #10 screws for mounting. If the AC40 is being mounted in a Mistic
panel, it is typically mounted
in the bottom left corner of the panel.
INTERFACES
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Form 521-070823
DATA SHEET
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Opto 22 • 43044 Business Park Drive • Temecula, CA 92590-3614 • Phone: (951) 695-3000 • (800) 321-OPT O • Fax: (951) 695-3095 • www.opto22.com
Inside Sales: (800) 321-OPTO • Product Support: (800)TEK-OPTO • (951) 695-3080 • Fax: (951) 695-3017 • E-mail: sales@opto22.com
POWER WIRING
The AC40 has two power supply options. The AC40A has a 120 VAC power requirement; the AC40B has a 240 VAC 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.
INTERFACES
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Opto 22 • 43044 Business Park Drive • Temecula, CA 92590-3614 • Phone: (951) 695-3000 • (800) 321-OPT O • Fax: (951) 695-3095 • www.opto22.com
Inside Sales: (800) 321-OPTO • Product Support: (800)TEK-OPTO • (951) 695-3080 • Fax: (951) 695-3017 • E-mail: sales@opto22.com
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.
10-PIN HEADER
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.
5-POSITION SCREW TERMINAL BLOCK
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Opto 22 • 43044 Business Park Drive • Temecula, CA 92590-3614 • Phone: (951) 695-3000 • (800) 321-OPT O • Fax: (951) 695-3095 • www.opto22.com
Inside Sales: (800) 321-OPTO • Product Support: (800)TEK-OPTO • (951) 695-3080 • Fax: (951) 695-3017 • E-mail: sales@opto22.com
RS-485 WIRING EXAMPLES
Note: The AC40 does not support the interrupt capability of remote bricks.
* Jumpering information is on page 10.
Note: When using multiple
panels of remote bricks, use the
5-position screw terminal.
Note: When only one panel of
remote bricks is attached to the
AC40, use the 10-pin header
INTERFACES
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Form 521-070823
DATA SHEET
page 9/14
Opto 22 • 43044 Business Park Drive • Temecula, CA 92590-3614 • Phone: (951) 695-3000 • (800) 321-OPT O • Fax: (951) 695-3095 • www.opto22.com
Inside Sales: (800) 321-OPTO • Product Support: (800)TEK-OPTO • (951) 695-3080 • Fax: (951) 695-3017 • E-mail: sales@opto22.com
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.
The AC40 is optimized to operate with 62.5 µm/125 µm fiber optic cable. It is possible to use other fiber diameters, however, the
performance specifications fall off rapidly.
Connect a fiber optic cable to the transmitter port on the AC40. Connect the other end of this fiber optic cable to the receiver port of
the connecting device. Likewise, connect a fiber optic cable to the receiver port on the AC40, and connect the other end of the cable to the
transmitter port of the connecting device.
After the fiber connections are in place, use cable ties to secure the fiber cables.
INTERFACES
TRADITIONAL
ST AND ALONE
Form 521-070823
DATA SHEET
page 10/14
Opto 22 • 43044 Business Park Drive • Temecula, CA 92590-3614 • Phone: (951) 695-3000 • (800) 321-OPT O • Fax: (951) 695-3095 • www.opto22.com
Inside Sales: (800) 321-OPTO • Product Support: (800)TEK-OPTO • (951) 695-3080 • Fax: (951) 695-3017 • E-mail: sales@opto22.com
JUMPERING
A group of 8 jumpers labeled A1 - A8 is located on the left-hand side of the upper printed circuit board on the AC40. The jumpers are
inserted to configure the AC40 RS-485 port. Jumpers A1 - A6 select various possibilities for biasing and termination of the RS-485 link.
Jumpers A7 and A8 are used to select 2-wire or 4-wire mode.
When you configure your AC40 RS-485 communications link, keep these facts in mind:
1) RS-485 requires termination at both ends of the communications wiring.
2) The link must be biased in one place only.
3) Opto 22 remote Bricks have no bias or termination options.
4) The G4TERMR terminator does not have bias options.
5) When G4LC32 RS-485 serial ports are terminated, they are automatically biased.
6) Biasing is usually done at the “HOST” end.
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
(AC40 is shipped with these
jumpers installed.)
4-wire Unterminated No Jumpers
4-wire Terminated/Biased A1, A2, A3, A4, A5, A6
4-wire Terminated/Not Biased A2, A5
INTERFACES
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Form 521-070823
DATA SHEET
page 11/14
Opto 22 • 43044 Business Park Drive • Temecula, CA 92590-3614 • Phone: (951) 695-3000 • (800) 321-OPT O • Fax: (951) 695-3095 • www.opto22.com
Inside Sales: (800) 321-OPTO • Product Support: (800)TEK-OPTO • (951) 695-3080 • Fax: (951) 695-3017 • E-mail: sales@opto22.com
REASSEMBLY
After all connections and jumpering are 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. Tighten both
thumbscrews evenly until the top case is secured
.
INTERFACES
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Form 521-070823
DATA SHEET
page 12/14
Opto 22 • 43044 Business Park Drive • Temecula, CA 92590-3614 • Phone: (951) 695-3000 • (800) 321-OPT O • Fax: (951) 695-3095 • www.opto22.com
Inside Sales: (800) 321-OPTO • Product Support: (800)TEK-OPTO • (951) 695-3080 • Fax: (951) 695-3017 • E-mail: sales@opto22.com
LEDS/DIAGNOSTICS
When power is applied to the AC40, the green LED labeled PWR is on. If it is not on, 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:
1) Receive and transmit fiber optic cables are swapped.
2) 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
3) The RS-485 port is incorrectly wired. Check:
(a) polarity of signals
(b) twisted pair cable must be used
DIMENSIONS
INTERFACES
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Form 521-070823
DATA SHEET
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Opto 22 • 43044 Business Park Drive • Temecula, CA 92590-3614 • Phone: (951) 695-3000 • (800) 321-OPT O • Fax: (951) 695-3095 • www.opto22.com
Inside Sales: (800) 321-OPTO • Product Support: (800)TEK-OPTO • (951) 695-3080 • Fax: (951) 695-3017 • E-mail: sales@opto22.com
SPECIFICATIONS
Ambient Temperature: 0° C - 70° C
95% relative humidity, non-condensing
Power:
AC40A:
AC40B:
120 VAC ± 10 VAC 60 Hz
240 VAC ± 20 VAC 50 Hz
Fiber Optic:
Recommended Fiber Size: 62.5/125 µm
Recommended Fiber:
"ST" Style Connectors:
Belden Type 225812 (Duplex)
Belden Type 225811 (Single)
Maximum Fiber Length: 3.5 kilometers
Transmitter Characteristics (All Typical)
r
Output:
Peak Emission Wavelength:
Numerical Aperture:
Optical Port Diameter:
-12.0 dBm
820 nm
0.31
150 µm
Receiver Characteristics (All Typical)
Receiver Sensitivity:
Equivalent Numerical Aperture:
Optical Port Diameter:
-24.0 dBm
0.50
400 µm
RS-485:
Maximum Cable Length: 3,000 feet
Recommended Cable Type
(twisted pair):
100 ohms impedence
12.5 picofarads per foot
Termination Resistance: 220 ohms
Tri-state Biasing Resistance: 470 ohms
Features:
* 2-wire or 4-wire hook-ups
* 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 AC40s per fiber link
INTERFACES
TRADITIONAL
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Form 521-070823
DATA SHEET
page 14/14
Opto 22 • 43044 Business Park Drive • Temecula, CA 92590-3614 • Phone: (951) 695-3000 • (800) 321-OPT O • Fax: (951) 695-3095 • www.opto22.com
Inside Sales: (800) 321-OPTO • Product Support: (800)TEK-OPTO • (951) 695-3080 • Fax: (951) 695-3017 • E-mail: sales@opto22.com
© 1991–2001 Opto 22. All rights reserved. All trademarks, trade names, logos, and service marks referenced herein belong to their respective companies.
CABLE AND CONNECT OR MANUFACTURERS
Belden Wire And Cable AT&T Network Systems
P. O. Box 1980 505 No. 51st. Avenue
Richmond, IN 47375 Phoenix, AZ 85043
800/235-3361 800/344-0223
Model: 62.5/125 Single - 225811
62.5/125 Duplex - 225812
Hewlett-Packard
3003 Scott Blvd.
Santa Clara, CA 95054
408/988-7000
DISTRIBUTOR OF FIBER OPTIC CABLES, CONNECTORS, AND ACCESSORIES
Fibertron
6400 Artesia Blvd.
Buena Park, CA 90620
Tel: (714) 670-7711
Fax: (714) 670-8811
INTERFACES
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DATA SHEET
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Opto 22 • 43044 Business Park Drive • Temecula, CA 92590-3614 • Phone: (951) 695-3000 • (800) 321-OPT O • Fax: (951) 695-3095 • www.opto22.com
Inside Sales: (800) 321-OPTO • Product Support: (800)TEK-OPTO • (951) 695-3080 • Fax: (951) 695-3017 • E-mail: sales@opto22.com
LATEST PRODUCTS
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COMPANY INFORMATION
Products
Opto 22 produces a broad array of reliable, flexible hardware and
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data acquisition, and machine-to-machine (M2M) applications.
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Based on the Internet Protocol (IP), SNAP Ethernet systems offer
flexibility in their network connectivity and in the software applications
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Controllers provide central control and data distribution. I/O units provide
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Machine-to-machine (M2M) systems connect your business computer
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Opto 22’s Nvio™ systems include everything you need for M2M—
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In delivering hardware and software solutions for worldwide device
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for life
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Opto 22’s Product Support Group offers comprehensive technical
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About Opto 22
Opto 22 manufactures and develops hardware and software products
for industrial automation, remote monitoring, enterprise data acquisition,
and machine-to-machine (M2M) applications. Using standard,
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Opto 22’s input/output and control systems allow customers to monitor,
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electronic assets that are key to their business operations. Opto 22’s
products and services support automation end users, OEMs, and
information technology and operations personnel.
Founded in 1974 and with over 85 million Opto 22-connected devices
deployed worldwide, the company has an established reputation for
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Opto 22 • 43044 Business Park Drive • Temecula, CA 92590-3614 • Phone: (951) 695-3000 • (800) 321-OPT O • Fax: (951) 695-3095 • www.opto22.com
Inside Sales: (800) 321-OPTO • Product Support: (800) TEK-OPTO • (951) 695-3080 • Fax: (951) 695-3017 • Email: sales@opto22.com • Form 1335-050601
© 2004-2005 Opto 22. All rights reserved. All trademarks, trade names, logos, and service marks referenced herein belong to their respective companies.
