Installation Instructions
Document No. 538-587
Rev. 3, December, 2001
Fiber Optic RS-232 Interface
Options
Product Description
The Fiber Optic RS-232 Interface (refer to Figure 1)
converts RS-232 electrical signals into light energy
for transmission over a fiber cable and converts the
light energy from a fiber cable back to RS-232
electrical signals. The device is designed to work at
speeds of 300 to 115K bps, with a link budget of
11.5dB, at 850 nm wavelength on 62.5 µm
multimode fiber.
There are no internal settings or user-serviceable
parts in the Fiber Optic RS-232 Interface. It requires
a duplex fiber cable between interfaces, (one fiber
for transmit and one for receive). ST style port
connectors are included with the interface.
NT0208R2
The Fiber Optic RS-232 Interface is housed in a 1.5”
× 4” × 4” metal enclosure. It contains one power
input receptacle, one RJ-11 style port (for the RS232 connection), one fiber transmit port, and one
fiber receive port (refer to Figure 2). The interface is
powered by a 6 Vdc external power pack (included).
All circuits are supervised and power limited. A data
cable (included) connects the Fiber Optic RS-232
Interface to the serial communication port of a PC or
terminal.
I
Power
Optional brackets may be ordered that allow the
interface to be mounted:
•
On a vertical surface.
•
In a 19-inch rack.
Product Numbers
Description
Fiber Optic RS-232 Interface with
ST port connectors
DB25F RS-232 to RJ-11 serial
data cable (included)
115 Vac 60Hz (14W) input 6 Vdc
600mA output power pack for use
with P/N 538-750 (included)
230 Vac 50 Hz (14W) input 6 Vdc
1000 mA output power pack for
use with P/N 538-745E (included)
Product Number
538-750(115 Vac)
538-750E (230 Vac)
536-011
538-757
538-747
CAUTION:
Use only the plug-in transformer shipped
with this device.
120 Vac transient protected duplex
outlet for 538-750 (not included)
Three 250 Vac Metal Oxide
Varistors (MOVs) included with P/N
538-750E
Optional wall mounting kit (4”)
Optional rack mounting kit (4”)
529-804
529-969
538-708K
538-716K
FIBER OPTIC
RS232 INTERFACE
TX1
Required Tools
RX1
Figure 1. Fiber Optic RS-232 Interface (Front View)
•
•
Slotted screwdriver
19-inch rack position available if using the
rack mounting kit
•
Wire cutters or wire strippers
Expected Installation Time
NT0207R1
538-750 Fiber to RS232
RS232
TX1 RX1
POWER INPUT
RECEPTACLE
PWR
6Vdc
150ma
15 minutes
Prerequisites
Operating Temp. 0-50 C (32-122 F)
RJ-11 STYLE
PORT
RECEIVE
PORT
TRANSMIT
PORT
Figure 2. Fiber Optic RS-232 Interface (Rear View)
CAUTION:
Avoid mounting the interface in a position
that forces the fiber to make turns tighter
than a three-inch radius. The mounting
surface must also be vibration free.
Page 1 of 3
Document No. 538-587
Installation Instructions
Rev. 3, December, 2001
•
•
•
•
•
Fiber cable installed and terminated with
proper connector.
Individual fibers identified as Transmit and
Receive.
A report from the installer showing the loss
of optic power per section of fiber cable,
including all connectors. The loss must be
less than the required link budget.
Source of transient protected for 115 Vac or
230 Vac. All field panel outlets are protected
or an MOV protected 120 Vac duplex outlet
(P/N 529-804), or three 250V MOVs
(included) connected for 230V operation
(refer to Figure 7) can be installed.
Terminal data port or PC COM port has a
RS-232 DB25M connector or obtain a 9 pin
to 25 pin adapter (not included) if required.
May obtain a RS-232 DB9F to RJ-11 cable
(540-143, not included) and substitute.
•
If connection to Field Panel MMI is required,
obtain a modem cable (538-858 or 538-678,
not included) which will be connected to the
serial data cable (536-011, included) and the
MMI port.
•
The mounting bracket (if used), or other
locally fabricated bracket, is available.
Instructions
1.
If a wall or rack mounting bracket is being used,
refer to the installation instructions for the
brackets (P/N 538-718).
2.
Remove the protective cap from the transmit
port and transmit fiber, and connect the fiber to
the port labeled “TX” (refer to Figure 2). Do not
use any tools to tighten the connectors.
3.
Remove the protective cap from the receive
port and receive fiber, and connect the fiber to
the port labeled “RX” (refer to Figure 2). Do not
use any tools to tighten the connectors.
4.
Connect the RJ-11 end of the RS-232 cable
(included) to the port labeled “RS-232” on the
rear of the unit.
5.
Connect the other end of the RS-232 cable to
the terminal data port, PC communications port,
or Field Panel MMI.
6.
Connect the power connector into the port
labeled “Power.” Plug the power pack into a
transient protected source.
The installation is now complete.
BRACKET
INTERFACE
FACE
BRACKET
NT0214R1
INTERFACE
MOUNTING
SCREW
BACK
END BEZEL
NT0212R2
Figure 3. Rack Mount of Fiber Optic Interface (Side View).
I
Power
FIBER OPTIC
TRUNK INTERFACE
TX1
RX1
I
Power
DUAL FIBER OPTIC
TRUNK INTERFACE
TX1
RX1
TX2
RX2
I
Power
FIBER OPTIC
TRUNK INTERFACE
TX1
RX1
I
Power
SPACER
FIBER OPTIC
RS232 INTERFACE
TX1
RX1
SPACER
RACK MOUNTING BRACKET
Figure 4. Multiple Unit Rack Mounting Installation.
Page 2 of 3
Siemens Building Technologies, Inc.
Document No. 538-587
Installation Instructions
Rev. 3, December, 2001
Power
FIBER OPTIC
s
NT0280R1
TX1
RX1
TRUNK INTERFACE
MOUNTING
BRACKETS
Figure 6. Field Panel Mounting.
MOUNTING
SCREWS
VERTICAL
SURFACE
Figure 5. Wall Mounting.
OUTLET BOX (COUNTRY DEPENDENT) AC. LINE
(AC HOT)
(AC NEUTRAL)
NT0226R1
(EARTH)
METAL OXIDE VARISTORS
(P/N 527-969*)
* MAX AC. (RMS) WHEN USING
527-969 (250 V) MOVS = 250 VAC (RMS)
Figure 7. MOV Connections.
Information in this publication is based on current specifications. The company reserves the right to make changes in specifications and
models as design improvements are introduced. Other product or company names mentioned herein may be trademarks of their respective
owners. © 2001 Siemens Building Technologies, Inc.
Siemens Building Technologies, Inc.
1000 Deerfield Parkway
Buffalo Grove, IL 60089-4513
U.S.A.
Your feedback is important to us. If you have
comments about this document, please send
them to technical.editor@sbt.siemens.com
Document No. 538-587
Printed in the U.S.A.
Page 3 of 3