SE-485-DIN MANUAL
OPTICALLY ISOLATED RS-232 TO RS-422/485
CONVERTER
November 9, 2004
Revision P1
Publication: SE-485-DIN-M
Document: S95-485-00000
Printed in Canada.
Copyright 2004 by Startco Engineering Ltd.
All rights reserved.
Startco Engineering Ltd. Page i
SE-485-DIN Converter Rev. P1
TABLE OF CONTENTS
PAGE
Table of Contents ....................................................................i
List of Figures......................................................................... ii
List of Tables .......................................................................... ii
1. Introduction.............................................................. 1
1.1 General ........................................................................1
1.2 Description ..................................................................1
2. Installation .................................................................2
3. Operation and Setup ................................................ 2
4. Technical Specifications ...................................... 3
LIST OF FIGURES
PAGE
1 Outline and Configuration Details .............................1
LIST OF TABLES
PAGE
3.1 Typical Communication Setups ................................. 2
3.2 Baud Rate Selection.................................................... 2
Pub. SE-485-DIN-M, November 9, 2004
Startco Engineering Ltd. Page ii
SE-485-DIN Converter Rev. P1
DISCLAIMER
Specifications are subject to change without notice.
Startco Engineering Ltd. is not liable for contingent or
consequential damages, or for expenses sustained as a
result of incorrect application, incorrect adjustment, or a
malfunction.
This product has a variety of applications. Those
responsible for its application must take the necessary
steps to assure that each installation meets all
performance and safety requirements including any
applicable laws, regulations, codes, and standards.
Information provided by Startco is for purposes of
example only. Startco does not assume responsibility for
liability for use based upon the examples shown.
Pub. SE-485-DIN-M, November 9, 2004
Startco Engineering Ltd. Page 1
SE-485-DIN Converter Rev. P1
1. INTRODUCTION
1.1 G
ENERAL
Startco Engineering Ltd. purchases the 485LDRC9
from B&B Electronics Ltd and modifies this component
to create the SE-485-DIN. Sections of this manual were
taken from the B&B Electronics publication “485LDRC91903-1/3”, tables were revised to reflect our unique
application.
The SE-485-DIN optically isolates and converts
unbalanced, full or half-duplex RS-232 signals to
optically isolated, balanced, full or half-duplex RS-422 or
RS-485 signals at baud rates up to 115.2 kbps. This unit
also surge suppresses the RS-422/485 lines. It features
Send Data Control circuitry so no software control of
handshake lines is required in RS-485 mode.
Baud rate is switch selectable from 9600 baud to 57600
baud. In two-wire RS-485 mode, the SE-485-DIN is
compatible with all Startco products with the RS-, EIA-,
or TIA-485 interface.
1.2 D
ESCRIPTION
Three LED’s indicate RS-485 Transmit Data, RS-485
Receive Data, and Power.
The SE-485-DIN has terminal blocks on the RS-232
side and the RS-422-485 side. The RS-232 side also has a
DB9 female connector. Transmit (TD), Receive (RD) and
Ground are supported on the RS-232 side. The unit is
powered by a supply voltage of 10 to 30 Vdc on the
RS-232 side. Transmit Data A (-), Transmit Data B (+),
Receive Data A (-), Receive Data B (+), and Ground are
supported on the RS-422/RS-485 side. Communication
features on the SE-485-DIN are dipswitch selectable on
the unit.
FIGURE 1 Outline and Configuration Details
Pub SE-485-DIN-M, November 9, 2004
Startco Engineering Ltd. Page 2
SE-485-DIN Converter Rev. P1
2. INSTALLATION
The SE-485-DIN is DIN rail mountable.
To remove Converter from Din Rail:
• Place a flat-blade screwdriver blade in disengage
clip on the converter enclosure.
• Gently pry on screwdriver handle.
• Rock enclosure toward you to release it from the
DIN rail.
TABLE 3.1 T
RS-485 2-Wire Mode
(Startco setting)
RS-485 4-Wire Mode
RS-422 4-Wire Mode
(1)
Transmitter always ON.
(2)
Receiver always ON.
(3)
For 2-wire mode, terminal G (TDA) is connected to K (RDA)
and terminal H (TDB) is connected to L (RDB).
(4)
For 4-wire mode, G (TDA) and H (TDB) are the transmit pair
and K (RDA) and L (RDB) are the receiver pair.
YPICAL COMMUNICATION SETUPS
Switch 1
TX Enable
Switch 2
RX Enable
ON ON Both ON
ON OFF
OFF
(1)
(2)
OFF
(2)
Switch 3, 4
(3)
Both OFF
(4)
Both OFF
(4)
3. OPERATION AND SETUP
Switch 1, 2, 3, and 4 select the interface mode. For
Startco applications set Switch 1, 2, 3, and 4 to ON. Use
terminal G (-) and H (+) for network connection.
Send Data Control recognizes the first bit of data from
the RS-232 side, enables the transmitter and disables the
receiver. After the last bit of data is sent from the
RS-232 side and a one-character timeout has occurred,
the transmitter is disabled and receiver is enabled. For
9600 to 57600 baud the timeout is selected with
dipswitches. For other baud rates, the timeout is set by
R11 inside the unit (see Table 3.2). A 120 Ω termination
resistance is selected with Switch 5.
TABLE 3.2 B
AUD RATE SELECTION
Switch 6 Switch 7 Switch 8 R11 Timeout (ms)
1200
2400
4800
9600*
19200*
38400*
57600*
115200
*Switch Selectable
OFF OFF OFF
OFF OFF OFF
OFF OFF OFF
820 kΩ
430 kΩ
200 kΩ
8.33
4.16
2.08
OFF OFF ON Not Installed 1.04
OFF ON OFF Not Installed .540
ON OFF OFF Not Installed .260
ON ON OFF Not Installed .176
OFF OFF OFF
8.2 kΩ
.0868
Pub SE-485-DIN-M, November 9, 2004
Startco Engineering Ltd. Page 3
SE-485-DIN Converter Rev. P1
4. TECHNICAL SPECIFICATIONS
Supply ....................................+10 to 30 Vdc @ 100 mA
Temperature Range ................ -40 to +80°C
Humidity Range ..................... 0 to 95% non-condensing
Data Rates ..............................1200 bps to 115200 bps
9600 bps to 57600 bps
switch selectable
See Table 3.2
Isolation.................................. 2000 Vac optical isolation
of data signals and ground
Surge Suppression.................. 7.5 v, bi-directional
avalanche breakdown
device.
500 W peak power
dissipation.
(1)
Clamping Time....................... <1 picosecond
(theoretical)
(1)
Switch settings provide a one character delay from
transmit to receive.
Pub SE-485-DIN-M, November 9, 2004
Startco Engineering Ltd. Page 4
SE-485-DIN Converter Rev. P1
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Pub SE-485-DIN-M, November 9, 2004
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