EC Data ECD232FO User Manual
ECD232fo User Manual
www.ecdata-tech.com
ECD
232
FO
U
SERS
M
ANUAL
RS-232
TO
F
IBER
O
PTIC
C
ONVERTER
1. I
NTRODUCTION
1.1. Block
Diagram
Isolated
Supply
Txd
Gnd
DSR
Rxd
9-pin Female RS-232 DCE
V+
V--
LED
DTR
Main
Supply
LED
LED
Txd
Rxd
Gnd
screw terminals
screw terminals
CTS
RTS
LED
TX
RX
Note: the RS-232 signals
are available at either the
9-pin or top screw terminals.
ST or SMA
1.2. Product
Over-view
The ECD232fo is designed specifically for use in in-
dustrial panel applications. It provides the following
unique combination of features:
Fiber optics provides an intrinsically 100% gal-
vanically isolated, noise-free, lightning immune
data communications signal. The ECD232fo uses
high-quality Hewlett-Packard (HP) components to
communicate up to 4km at 820nm over 62.5/125,
100/140, or 50/125 µm fibers. ST or SMA con-
nectors are available.
The ECD232fo has two RS-232 ports - a 9-pin d-
shell and 3 compression screw terminals. These
are actually independent ports and you connect a
2
nd
device to the 2
nd
port. It has 2 main uses; 1)
You can connect a notebook computer to the 2
nd
port to monitor the communications or introduce
“noise” to test your error recovery, and 2) during
factory or lab testing, you can run 3-wire RS-232
cables between your ECD232fo units instead of
making a lot of short-use fiber test cables.
Optionally, the RS-232 ports of the ECD232fo can
have 2500v optical/galvanic isolation from the
power supply. (Note the 2 RS-232 ports always
share the same ground).
With a floating ground, RS-232 cable runs up to
50m can be guaranteed with quality, low-
capacitance cable like Beldon 1422A at 42pF/m.
(RS-232 requires less than 2500pF per signal)
For rapid troubleshooting and to simplify installa-
tion, you can treat the Rxd screw terminal as a
test signal. Connecting a +5 to +15vdc signal to it
will force the fiber optic transmitter on. Visible
even with the naked eye, this allows very quick
checking of fiber “continuity”.
For
rapid
troubleshooting, there are LED indica-
tors for the Txd, Rxd, input power and isolated
power
.
Wide power supply range (9 to 36vdc) allows use
with 9v, 12v, 15v, 24v power supplies or direct
from 12v or 24v battery systems.
Use of one 9-pin female “DCE like” port allows
use of ribbon cables from 9-pin computer ports.
2. I
NSTALLATION
2.1. RS-232
connection:
The ECD232fo has one 9-pin female connectors con-
figured in a standard DCE COM port. This means you
can use a 9-pin ribbon cable to connect it to your stan-
dard 9-pin computer ports. Internal to the ECD232fo
the DTR/DSR pins and RTS/CTS pins are connected
to support the use of ribbon cables.
Standard RS-232 interface devices cannot be dam-
aged by reverse wiring or short-circuits to ground.
Be warned that some low-cost devices use transistors
to approximate an RS-232 signal and this built-in pro-
tection may be lacking. 24 to 28 AWG shielded wire is
suggested.
9-pin to 9-pin
25-pin to 9-pin
2
5
4
6
Rxd
Gnd
DTR
DSR
3 Txd
7
8
RTS
CTS
3
7
20
6
Rxd
Gnd
DTR
DSR
2
Txd
4
5
RTS
CTS
CD
CD
8
1
device, 25-pin
rdc232fo
×
Example Cables (DTE to DCE)
2.2. Fiber Optics Connection:
The ECD232fo has either 2 ST-compatible bayonet
connectors (option -st) or 2 SMA threaded connectors
(option -sma). Note that all fiber optic cables need
gentle handling and have a specified minimum bend
radius. Please refer to your cable specs for details,
but you should plan on providing space to neatly coil a
6 inch or 15cm loop diameter of extra fiber.
2.3. Power Supply Connection:
A fuse must be installed in the V+ supply wire. Models
with 2-port isolation (-2p) have internal diodes to pro-
vide full reverse supply protection. Models without
isolation (-1p) have internal diodes which will attempt
to blow this fuse if you reverse wire the power supply.
2.4. Testing your fiber:
Supply a +5 to +15 volt signal to the Rxd screw termi-
nal as a test signal. For the isolated models you will
also need to connect the Gnd screw terminal. This will
force the fiber optic transmitter on. Note that the unit
will use about 3 times the normal supply current during
this test mode.
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