W&T RS232 Manual de usuario
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W&T RS232 Multi Computer Adapter
Subject to error and alteration
W&T
Manual
RS232 Multi Computer Adapter
Release 1.2
Model 85603
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W&T RS232 Multi Computer Adapter
© 10/2006 by Wiesemann & Theis GmbH
Subject to error and alteration:
Since it is possible that we make mistakes, you mustn’t use
any of our statements without verification. Please, inform us
of any error or misunderstanding you come about, so we can
identify and eliminate it as soon as possible.
Carry out your work on or with W&T products only to the
extent that they are described here and after you have com-
pletely read and understood the manual or guide. We are not
liable for unauthorized repairs or tampering. When in doubt,
check first with us or with your dealer.
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W&T RS232 Multi Computer Adapter
Subject to error and alteration
The W&T RS232 Multi Computer Adapter model 85603 per-
mits automatically controlled, bi-directional connection of
two data sources to one peripheral device.
With this unit two PCs, a serial printer, a plotter, a portable
scanner or a card reader for example can be shared without
requiring manual intervention to switch them: automatic se-
lection is on the first come, first served principle.
The interfaces of the Multi Computer Adapter can be
configured independently of each other, so that converting
the baud rate, data format and handshake procedure is no
problem.
Additional information about W&T products and new deve-
lopments can be found on the Internet at http://www.wut.de
or are available in the e-mail infograms offered by the W&T
Interface Club, which you can sign up for at the W&T home-
page.
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W&T RS232 Multi Computer Adapter
Contents
Function ............................................................................ 23
Supply voltage ................................................................... 23
Mechanical features and enclosure..................................... 24
Wiring assignments ........................................................... 24
Display and control elements ............................................. 26
Configuring the serial ports ............................................... 27
Serial format ......................................................................28
Handshake procedure ........................................................ 28
Setting the format - DIL switches ........................................ 29
Modes ............................................................................... 30
Manual mode ..................................................................... 30
Standard mode .................................................................. 30
Transparent mode ............................................................. 30
Setting the modes.............................................................. 31
Diagnostic functions ..........................................................32
Settings dump ................................................................... 32
Connection example ..........................................................34
Technical Data ................................................................... 35
Declaration of Conformity .................................................. 36
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W&T RS232 Multi Computer Adapter
Subject to error and alteration
RS232 Multi Computer Adapter, Model 85603
The W&T RS232 Multi Computer Adapter 85603 permits a
bi-directional connection of two serial data sources to a
peripheral device. Automatic switching between the two
senders is done on a time-controlled basis: The data sender
that wants first to output something automatically blocks the
outputs from the other source. If the data sender implements
a pause, both inputs are again ready to receive after a
configurable timeout time. Two LEDs on the front panel of
the switch indicate which of the two input channels is
currently active.
Supply voltage
The supply voltage for the T-switch is provided by an
integrated switched-mode power supply. This features a
variable input voltage range and allows the T-switch to be
powered using the AC adapter provided or alternately by any
AC or DC voltage between 12 and 24V. The supply connec-
tion is reverse polarity protected and is made using the
included plug-in screw terminal.
Important: When powering the T-switch externally you
must ensure that the supply voltage used is potential-
free. Voltage sources with a ground reference can
damage the T-switch and/or the connected serial devices.
We therefore recommend using the power supply
included in the scope of delivery.
1
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W&T RS232 Multi Computer Adapter
Mechanical features and enclosure
The T-switch comes with three 9-pin RS232 ports and is
integrated into a 45mm wide plastic housing for mounting
on standard rails conformal with DIN EN 50022-35.
Port A Port B
Port C
Pwr Err A B
Clr Dump
Configuring the serial ports and T-switch operating
modes requires opening the housing of the device. For
this purpose it is advantageous to screw a SUB-D plug
with body to one port on the T-switch and use the
attached plug to assist in pulling off the housing cover.
Wiring assignments
The RS232 ports A and B are implemented as SUB-D female
connectors with DCE pin functions, and port C as a SUB-D
male connector with DTE pin functions. This design ensures
that the T-switch can be wired into the majority of
applications with standard 1:1 cables. In addition, this pin
configuration make installation and startup easier, since the
data transfer can be tested first without involving the
T-switch by simply connecting the cables together.
1
25
W&T RS232 Multi Computer Adapter
Subject to error and alteration
The pinout for the individual ports can be found in the follo-
wing tables.
RS232 input Port A and B with DCE pin functions:
Pin# Function Signal Direction
1 always "on" DCD output
2 data out RxD output
3 data in TxD input
4 handshake in DTR input
5 signal GND GND GND
6 handshake out DSR output
7 not connected RTS input
8 handshake out CTS output
9 always "off" RI output
RS232 output Port C with DTE pin functions:
Pin# Function Signal Direction
1 not connected DCD input
2 data in RxD input
3 data out TxD output
4 handshake out DTR output
5 signal GND GND GND
6 not connected DSR input
7 always "on" RTS output
8 handshake in CTS input
9 not connected RI input
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W&T RS232 Multi Computer Adapter
Display and control elements
The device uses four LEDs, a green „Power“ for indicating
correct supply voltage and the LEDs marked „A“ and „B“ to
indicate which input channel is active.
The LED marked „Error“ indicates the presence of parity or
framing errors in running data traffic and can only be
cleared explicitly by pressing the „Clear“ key. The „Clear“ key
resets the T-switch and deletes all internal data and error
memories.
Pressing the „Dump“ key when the device is turned on
outputs the current setting of the T-switch on whichever
serial port has been selected using the DIL switches.
Additional information about this function can be found in
the section Diagnostic functions > Setting-dump.
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W&T RS232 Multi Computer Adapter
Subject to error and alteration
Configuring the serial ports
All three ports on the T-switch can be configured for
transmission rate, data format and handshake procedure
completely independently of each other. This feature allows
you to connect the T-switch to terminal devices which use
different serial data formats.
The modular construction of the T-switch allows you to
incorporate other interface modules to convert the interface
type within the device. Especially when larger quantities are
involved changing over the T-switch with other interface
modules represents an economical alternative to the
external converters otherwise commonly used. Please contact
us with any requirements for special versions of the T-switch.
You set the serial parameters using three DIL switch banks
SW1..SW3 inside the device. The position and arrangement of
the DIL switch banks with respect to the corresponding port
can be seen in the following sketch.
SW1 SW2 SW3 SW4
Serial Port Settings
Port A Port B Port C
Operat.
Mode
Port B
Port A
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W&T RS232 Multi Computer Adapter
Serial format
Baud rate, number of data bits and any parity bit which may
be used can be configured separately for each port on the
T-switch, so that the format can be adapted to any connected
terminal device.
Handshake procedure
All serial ports on the T-switch can be set to hardware
handshake or XON/XOFF handshake independently of each
other. Operating the T-switch with no handshake is not
recommended.
When one of the internal buffers in the T-switch is nearly
filled with data, an XOFF code (13H) is output on the
corresponding port and for the next received character the
hardware handshake output is set to ‚Block‘ (negative level).
Once the buffer has been emptied again, an XON code (11H)
is output and the hardware handshake output is set to
‚Enable‘ (positive level).
If the T-switch receives an XOFF code or detects a block level
(negative level) on the hardware handshake input, it stops
sending data on the corresponding port no later than one
byte after this state is detected. If the T-switch receives an
XON code or detects an enable level (positive level) on the
hardware handshake input, it resumes sending data.
The XON and XOFF codes are used only for the handshake;
these codes are not data and are also not allowed to be
contained in the user data. If a hardware handshake is used
however and the T-switch is correspondingly configured, the
XON and XOFF codes are treated as normal data.
When hardware handshake inputs are open or improperly
wired, the T-switch may send no data on the affected port.
If you use only software handshake and configure the
T-switch accordingly, this problem will of course not occur.
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