Western Telematic CAS-81 Manuel utilisateur
WTI Part Number: 12365
Rev. D
CAS-81
8-Port Code Activated Switch
Preliminary Draft
July 1995
User's Guide
Table of Contents
1. Introduction ...........................1-1
2. Unit Description .........................2-1
2.1. Front Panel Indicators .......................2-1
2.2. Back Panel .............................2-2
3. Installation ............................3-1
3.1. Set DIP Switches..........................3-1
3.1.1. Data Rate (Baud) Selection (Switches 1 through 3)..3-1
3.1.2. Timeout Selection (Switches 4 and 5) .........3-1
3.1.3. Quiet Mode (Switch 6) ..................3-2
3.1.4. Auto Connect Serial Port 1 (Switch 7) .........3-2
3.1.5. Broadcast Mode (Switch 8) ...............3-2
3.1.6. Force CTS (Switch 9)...................3-3
3.1.7. Force DCD (Switch 10)..................3-3
3.2. Connect Power Cable .......................3-3
3.3. Connect Devices to Serial Ports .................3-3
3.4. Connect Control Port .......................3-4
3.5. RS422 Line Driver Option ....................3-4
4. Operation .............................4-1
4.1. Power Up ..............................4-1
4.2. ASCII Characters .........................4-1
4.3. Command String ..........................4-2
4.4. Command Response ........................4-2
4.5. Port Gating .............................4-3
4.5.1. Open Port Gating .....................4-3
4.5.2. Close Port Gating .....................4-3
Appendices
A. Description of System Interfaces .............Apx-1
A.1. Control Port (DB25 Female) .................Apx-1
A.2. Serial Ports 1 through 8 (DB9 Male).............Apx-2
A.2.1. RS422 Line Driver Option ..............Apx-2
B. Specifications .........................Apx-3
C. FCC Notice ..........................Apx-4
D. Customer Service.......................Apx-5
i
List of Figures
2.1. Front Panel Indicators ........................................................................2-1
2.2. Back Panel............................................................................................2-2
A.1. Control Port / Serial Port Interface.............................................Apx-1
A.2. RS422 Option Interface ................................................................Apx-2
ii
Table of Contents
1. Introduction
The CAS-81 Code Activated Switch brings the convenience of
code-based RS232 switching to sites with multiple terminals,
printers, and peripherals. The CAS-81 enables a single RS232
Control Port to switch between 8 devices via an ASCII code
sequence.
Code based switching lets you control the CAS-81 from your PC
or mainframe. When a modem is attached to the Control Port,
the CAS-81 can also be managed from a remote location.
Devices can be connected or disconnected by sending commands
from a remote PC via modem.
The CAS-81 can operate at speeds up to 115,000 bps and passes
data in "real-time" with no delays. Binary and graphics files can
be safely passed due to the unique 8 character switch instruction,
which considerably reduces the chances of false switching.
A broadcast mode makes it easy to mass-address a group of
printers, display devices, or an array of laboratory instruments by
directing the data on the Control Port to all Serial Ports
simultaneously. The broadcast mode may be selected by code or
permanently selected by the Select Switch.
An Auto-connect feature allows the Control Port to automatically
connect to Serial Port 1 each time the unit is powered up, or after
a timeout or disconnect. This provides a data path to a critical
device in case of a power failure, or convenient connection to
commonly used equipment.
Each Serial Port may be configured for a balanced RS422 long
distance line driver by simply removing the socketed RS232
driver chip and plugging in an optional RS422 module. When
the module is installed, an LED on the back panel indicates the
port is RS422.
1-1
Applications
·Industrial Robotic and Numeric Control
·Remote Diagnostics
·Laboratory Equipment Polling
·Data Acquisition
·Network Management
Typographic Conventions
Throughout the manual, typefaces and characters have been used
to denote the following:
^(e.g. ^X) Indicates a key combination that is used
to invoke a command. For example, the
text "^X" (Control X) indicates that the
[Ctrl] key and the [X] key should be
pressed simultaneously.
COURIER FONT Indicates characters typed on the keyboard.
For example, ^VS or ^C#.
1-2
CAS-81 User's Guide
2. Unit Description
2.1. Front Panel Indicators
ÀON: Indicates power to the unit is ON.
ÁRDY: Indicates unit is Ready to operate. A steady blink
indicates that the CAS-81 is operating normally.
ÂTXD: Indicates that data is being received at Control Port
pin 2.
ÃRXD: Indicates that data is being transmitted out Control
Port pin 3. Also indicates that data is being received by
pin 2 of a selected Serial Port.
ÄRTS: Indicates that the "Request to Send" signal is present
at Control Port pin 4.
ÅCTS: Indicates that the "Clear to Send" signal is present at
Control Port pin 5. Also indicates that the "Clear to Send"
signal is present at pin 8 of a connected Serial Port.
Always high when all ports are disconnected.
ÆDTR: Indicates that the "Data Terminal Ready" signal is
present at Control Port pin 20.
ÇDCD: Indicates that the "Data Carrier Detect" signal is
present at Control Port pin 8. Also indicates that the "Data
Carrier Detect" signal is present at pin 1 of a connected
Serial Port. Always high when all ports are disconnected.
ÈSerial Ports1-8: Indicates that the corresponding
numbered Serial Port is currently connected.
2-1
Figure 2.1: Front Panel Indicators
2.2. Back Panel
ÀSerial Ports1-8: Eight RS232 DB9 male connectors
configured as DTE. Accepts a standard AT 9 pin to printer
or modem cable, depending on the application. Refer to
Appendix A for more information on the Serial Port
Interface.
Note that when the RS422 Line Driver Option has been
installed, the LED indicator above the Serial port will light
to indicate that the corresponding port is configured for
RS422 communication.
ÁControl Port: RS232 DB25 female connector configured
for DCE. Accepts a standard PC to Modem Cable.
The CAS-81 will respond to proper ASCII code strings
received by the Control Port. Once a port is selected, data
will pass between the Control Port and the selected Serial
Port. Refer to Appendix A for more information on the
Control Port interface.
ÂDefault Switch: A 10 position DIP switch that is used to
select the Control Port Data Rate, No-data timeout period,
and the Auto connect and broadcast features. This switch
is read upon power up.
ÃAC Power: AC power cord receptacle and ON/OFF
switch. The CAS-81 features a 100/240 VAC autosensing
universal power supply.
2-2
CAS-81 User's Guide
Figure 2.2: Back Panel
3. Installation
3.1. Set DIP Switches
The DIP Switches located on the CAS-81 back panel are used to
set the Data Rate, Timeout Selection, Quiet Mode, Broadcast
Mode, and other features. Note that a label on the underside of
the CAS-81 unit also describes DIP Switch settings.
3.1.1. Data Rate (Baud) Selection
(Switches 1 through 3)
Select the Baud Rate for the Control Port. The Baud Rate must
match that of the control device. The CAS-81 is transparent to
parity and will operate at 7 bits even or odd parity, and at 8 bits
no parity.
Switch Baud Rate
123
Down Down Down 1200
Up Down Down 2400
Down Up Down 4800
Up Up Down 9600
Down Down Up 19.2K
Up Down Up 38.4K
Down Up Up 57.6K
Up Up Up 115K
3.1.2. Timeout Selection (Switches 4 and 5)
Selects the No-Data-Activity disconnect period. If data has not
been received by the Control Port for the specified time period,
the selected Serial Port will close.
Switch Timeout Selection
45
Down Down Off
Up Down 5 Seconds
Down Up 30 Seconds
Up Up 60 Seconds
3-1
3.1.3. Quiet Mode (Switch 6)
When enabled, the CAS-81 will not respond with
"Connect/Disconnect" messages.
Switch 6 Quiet Mode
Up Enable
Down Disable
3.1.4. Auto Connect Serial Port 1 (Switch 7)
When enabled, automatically connects the Control Port to Serial
Port 1 on the following conditions:
1. Power Up
2. After a Timeout disconnect, if selected.
3. After a Code sequence disconnect.
Switch 7 Auto Connect Serial
Port 1
Up Enable
Down Disable
3.1.5. Broadcast Mode (Switch 8)
When enabled, permanently activates the Broadcast Mode. Data
from the Control Port will be sent out all eight Serial Ports. Note
that when the Broadcast Mode is active, all Serial Port Status
LEDs will be lit.
Data received by the selected Serial Ports will be "ord" and
passed out the Control Port. If data is received by two ports
simultaneously, data output may be garbled.
A broadcast one/all jumper located on the circuit board will
block received data from Serial Ports2-8. This feature allows
the Control Port to receive a response message from just one
device when broadcasting commands. Receiving data from
multiple devices simultaneously may cause garbled data.
Switch 8 Broadcast Mode
Up Enable
Down Disable
3-2
CAS-81 User's Guide
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