ATEN IC485SN User manual

Unpacking
The IC-485SN package contains:
- One IC-485SN Converter
- One User Manual
Check to see if the product has been damaged in shipping.
If you encounter a problem , contact your dealer right away.
Copyright 1998 ATEN International Co., Ltd.
Manual Part No. PAPE-1134-100
Printed in Taiwan 01/1999
All brand names and trademarks are the registered property of their respective owners
CR
SJ/T 11364-2006
The following contains information that relates to China

Online Registration ................................................. 1
Overview ............................................................... 2
Features ............................................................... 2
Switch Configuration ............................................... 3
Operating Modes .................................................... 4
Point-to-Point ......................... .......................... 4
Multidrop........................................................... 5
Simplex .............................................................8
Installation ..............................................................9
Appendix................................................................10
Terminal Block Pin Assignments ........................10
DCE/DTE Connection Description .....................10
SW2 Pin Assignment Schematics ......................10
Troubleshooting ................................................11
Specifications ...................................................12
Radio & TV Interference ....................................13
Table of Contents

1
Online Registration
Online Support
You can register your product at our online support center:
product_registration
through our support center:
International - http://support.aten.com
North America - http://www.aten-usa.com/support.
and Software Updates (firmware and drivers)
are available at the ATEN website:
International - http://www.aten.com
North America - htttp://www.aten-usa.com
International - http://support.aten.com
North America - http://www.aten-usa.com/
Online technical support is available to ATEN customers
Troubleshooting, Documentation (including online
manuals),
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Features
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Data Transmission Controlled by the RTS Signal
DCE/DTE Selectable
Point to Point/Multidrop, and Simplex/Duplex Operating
Modes
External Power Not Required - Power Supplied by
The RS-232 Interface
Compact Size
2
Overview
The IC-485SN is a bidirectional converter for RS-232 and
RS-485/RS-422 interfaces that provides Point to Point,
Multidrop, and Simplex operations. A figure showing the
names and locations of its features is given below:
The operating mode, contention control and RS-232C
assignments are all configured with two slide switches: SW1
and SW2 (details are given in the section,
below).
Switch Configuration
Spare
Power Jack
RJ-11
Terminal Block
SW 1
SW 2 RS-232 DB-25 Female Connecter

Term
DCE
DTE
TxON, RxON
TxRTS, RxON
TxDTR/RTS, RxDSR/ON
Meaning
DCE means Data Communication Equipment; if the
IC-485SN is going to be plugged into a DTE
device, the IC-485SN must be set to DCE.
DTE means Data Terminal Equipment; if the IC-
485SN is going to be plugged into a DCE device,
the IC-485SN must be set to DTE.
This setting is used in Point-to-Point operations, in
which the unit is always in Transmitting and
Receiving mode. (See P.10 Schematic)
This setting is used in Multidrop operations, in which
the unit is always in receiving mode and it is in
transmitting mode only when the RTS signal is high.
(See P.11 Schematic)
This setting is used in Multidrop Half Duplex
operations to monitor the RS-485 line signals.
Receiving mode is always ON. DSR is used to check
If the line is busy. If not busy, the RTS signal is set
high, allowing data transmission. Prior to
transmission a DTR signal is sent to keep the other
devices from transmitting.
(See P.11 Schematic)
Position
1
2
3
SW1
DCE
DTE
SW2
TxON, RxON
TxRTS, RxON
TxDTR/RTS, RxDSR/ON
3
Switch Configuration
The IC-485SN is configured by setting two slide
switches.SW1isusedtoselecttheIC-485SN's
Device Mode; SW2 is used to select the IC-485SN's
Transmitting and Receiving Mode, as shown in the
table below:
An explanation of the SW1 and SW2 terms is given
in the table below:

TX+
TX -
R+
X
RX -
TX+
TX -
R+
X
RX -
Connect
to PC#1's
COM port
Connect
to PC#2's
COM port
5
4
2
3
5
4
2
3
DB-25 DB-25
RJ-11 RJ-11
4
Operating Modes
The IC-485SN supports three operating modes: Point-
to-Point, Multidrop, and Simplex. Point-to-Point and
Multidrop can be configured for Full Duplex or Half
Duplex operation. Each of the operating modes is
explained below.
Point-to-Point
A Point-to-Point configuration is one in which two devices,
located at two different places, are linked for
communication by a pair of IC-485SN units. There are two
configurations: Point-to-Point Full Duplex
and Point-to-Point Half Duplex.
1. Point-to-Point 4 Wire Full Duplex
Point-to-Point Full Duplex uses reverse four wire
cabling, as shown in the figure below.
s
For both IC-485SN units, set SW2 to TxON, RxON
For both IC-485SN units, set SW1 to DCE or DTE
depending on what type of device the IC-485SN will
plug into (if it will plug into a DCE device, configure it
for DTE, and vice versa).
s
s

Connect
to PC#1's
COM port
Connect
to PC#2's
COM port
5
4
2
3
5
4
2
3
DATA+
DATA -
BUSY+
BUSY -
DATA+
DATA -
BUSY+
BUSY -
DB-25 DB-25
RJ-11 RJ-11
5
2. Point-to-Point 4 Wire Half Duplex
four wire cabling, as shown in the figure below:
Point-to-Point Half Duplex uses straight throughs
s
s
For both IC-485SN units, set SW1 to DCE or DTE
depending on what type of device the IC-485SN will
plug into (if it will plug into a DCE device, configure it
for DTE, and vice versa).
TxDTR/RTS, RxDSR/ON transmitting/receiving
mode, involves a straight through Data+, Data-,
Busy+, Busy- wiring scheme. See the pin
assignment schematic in the Appendix for more
Details.
For both IC-485SN units, set SW2 to TxDTR/RTS,
RxDSR/ON
Note:
Multidrop
A Multidrop configuration is one in which more than two
devices are linked for communication using several IC-485SN
units. Either a two-to-one RJ-11 adapter or a combination of
the terminal block and the RJ-11 jack can be used to connect
the IC-485SN units to each other. One of the devices that one
of the IC-485SN units connects to is assigned to be the master
device. The remaining devices that the other IC-485SN units
connect to are slave devices. There are two configurations:
Multidrop Full Duplex and Multidrop Half Duplex.

T+
T-
R-
R+
R+
R-
T-
T+
R+
R-
T-
T+
.
.
.
Bn
PC1
COM1/
COM2
PC2
COM1/
COM2
PC3
COM1/
COM2
6
1. Multidrop 4 Wire Full Duplex
Multidrop Full Duplex uses reverse four wire cabling to
link all the connected IC-485SN units, as shown in the
figure below:
s
s
s
s
For all IC-485SN units, set SW1 to DCE or DTE
depending on what type of device the IC-485SN will plug
into (if it will plug into a DCE device, configure it for DTE,
and vice versa).
For the Master IC-485SN unit, set SW2 to TxON, RxON
For all Slave IC-485SN units, set SW2 to TxRTS, RxON

DATA+
DATA -
BUSY+
BUSY -
DATA+
DATA -
BUSY+
BUSY -
DATA+
DATA -
BUSY+
BUSY -
DATA+
DATA -
BUSY+
BUSY -
Connect
to PC#1's
COM port
Connect
to PC#2's
COM port
Connect
to PC#3's
COM port
Connect
to PC#4's
DB-25
RJ-11
RJ-11
RJ-11
RJ-11 DB-25
DB-25 DB-25
5
4
2
3
5
4
2
3
5
4
2
3
5
4
2
3
7
2. Multidrop Half Duplex
Multidrop Half Duplex uses straight through four wire cabling
to link all the connected IC-485SN units, as shown in the
figure below:
s
s
s
For all IC-485SN units, set SW1 to DCE or DTE depending on
what type of device the IC-485SN will plug into (if it will plug
into a DCE device, configure it for DTE, and vice versa).
For all IC-485SN units, set SW2 to TxDTR/RTS, RxDSR/ON
Note : Only one device at a time can talk on the bus (RTS
On);during that time, the other devices must remain
silent (RTS Off). See the explanation regarding
TxDTR/RTS, RxDSR/ON in the table on p. 3.
TxDTR/RTS, RxDSR/ON transmitting/receiving mode,
involves a straight through Data+,Data-, Busy+, Busy-
wiring scheme. See the pin assignment schematic in
the Appendix for more details.

T+
T-
R-
R+
IC-485SN
R+
R-
T-
T+
R+
R-
T-
T+
PC1
COM1/
COM2
PC2
COM1/
COM2
PC3
COM1/
COM2
R+
R-
T-
T+
PC4
COM1/
COM2
8
Simplex
A Simplex configuration is one in which more than two
devices are linked for communication using several IC-
485SN units in a manner similar to a Multidrop
configuration. The difference is that in a Simplex
configuration, the master device can only talk, and the
slave devices can only listen.
Simplex uses reverse two wire cabling to link all the
connected IC-485SN units, as shown in the figure below:
s
s
s
For all IC-485SN units, set SW1 to DCE or DTE
depending on what type of device the IC-485SN will plug
into (if it will plug into a DCE device, configure it for DTE,
and vice versa).
For all IC-485SN units, set SW2 to TxON, RxON
.
.

9
Installation
1. Set the configuration switches (SW1 and SW2) according to
the information provided in the Switch Configuration and
Operation sections.
2. Plug the IC-485SN's DB-25 female connector into the PC's
RS-232C port.
3. Use telephone cable to connect one IC-485SN unit to the
other.
a) Use four wire or two wire cable according to the
information given in the Operation section.
b) Use reverse or straight through wiring according to the
information given in the Operation section.
c) You can use the RJ-11 telephone jack, or wire directly to
the Terminal Block (see the Appendix for the Terminal
Block pin assignments). If you are daisy chaining units,
you will need to use either a two-to-one RJ-11 adapter or
a combination of the terminal block and the RJ-11 jack.
4. Power On the PC. The unit is now ready for operation.

2
3
8
7
4
6
5
3
2
7
8
6
4
5
3
2
5
4
20
6
7
2
3
4
5
6
20
7
2
3
4
5
6
20
7
3
2
5
4
20
6
7
Tx Rx
Rx Tx
RTS CTS
CTS RTS
DSR DTR
DTR DSR
GND
Cable
25/25
9/25 pin
IC-485SDevice's Connector Pin #
Pin
1
2
3
4
Assignment
Transmit +V
Transmit -V
Receive -V
Receive +V
Appendix
Terminal Block Pin Assignments
DCE/DTE Connection Description
10
SW2 Pin Assignment Schematics
TxON, RxON:
1Tx+
2TX-
3RX-
4RX+
Tx 2
Rx 2
RTS
CTS
DTR
DSR

11
TxRTS, RxON:
1Tx+
2TX-
3RX-
4RX+
Tx
Rx
DTR
CSR
RTS
CTS
Tx
Rx
Tx
Rx
DCE
DTE
DCE
DTE
DCE
DTE
TxDTR/RTS, RxDSR/ON:
1DATA+
2DATA-
3BUSY-
4BUSY+
RTS
CTS
DTR
DSR

Power Consumption
Data Rate
Connectors
Function Switches
Enclosure
Weight
Dimensions (LxWxH)
6.51 mA
Up to 100K bps under 4,000 ft. (1.2 Km)
DB-25 female
A 4 terminal block or RJ-11
DCE / DTE Select
TxON, RxON
TxRTS, RxON
TxDTR/RTS, RxDSR/ON
Plastic
60 g
54 x 74.5 x 18.5 mm
RS-232C
RS-485/422
SW1
SW2
12
Specifications
Troubleshooting
If the above solutions fail to alleviate the problem, contact
your dealer for help.
Problem
Data Transmission Failure
Data Loss or Error
Solution
Check that the IC-485SN units are securely
plugged into the PC's serial ports.
Check that the cables are properly
set up and properly connected.
Check that SW1 and SW2 are set properly.
Check that the Data Rate and Data Format
are the same for both devices.

13
Warning. This equipment generates, uses and radiates radio
frequency energy and if not installed and used in accordance
with the instruction manual may cause interference to radio and
television reception. It has been tested and found to comply
with the limits for a Class A computing device in accordance
with the specifications in Subpart J of Part 15 of the FCC Rules,
which are designed to provide reasonable protection against
such interference when operated in a commercial environment.
Operation of this equipment in a residential area is likely to
cause interference, in which case the user at his own expense
will be required to take whatever measures may be required to
correct the interference.
If this equipment does cause interference to radio or television
reception, which can be determined by turning the equipment
off and on, the user is encouraged to try to correct the
interference by one or more of the following measures:
1. Reorient the receiving antenna.
2. Relocate the computer with respect to the receiver.
3. Move the computer away from the receiver.
4. Plug the computer into a different outlet so that the computer
and receiver are on different branch circuits.
5. Ensure that the mounting screws, attachment connector
screws and ground wires are tightly secured.
6. Ensure that good quality shielded and grounded cables are
used for data communications.
If necessary, the user should consult the dealer or an
experienced radio/television technician for additional
suggestions.
Radio & TV Interference