Western Telematic CAS-161A User Manual
WTI Part No. 12114
Rev. D
CAS-161A
Code Activated Switch
User’s Guide
5 Sterling
(949) 586-9950
Fax: (949) 583-9514
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Irvine
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California 92618
Toll Free: 1-800-854-7226
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http://www.wti.com
Table of Contents
1. Introduction
2. Unit Description
2.1. Front Panel Indicators
2.2. Back Panel Components
3. Installation
3.1. Configure SetUp Switches
3.1.1. SetUp Switch Bank 1
3.1.2. SetUp Switch Bank 2
3.2. Connect Power Cable
3.3. Connect Data Cables
4. Port Selection ............................................4-1
4.1. Selecting a Port ........................................4-1
4.2. Closing/Opening All Ports .................................4-2
Appendices
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3.1.1.1. Prefix Code Repetition Value (Sw1 - Sw4)
3.1.1.2. Broadcast Mode (Sw5)
3.1.1.3. Baud Rate Select (Sw6 - Sw8)
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3.1.2.1. Prefix Code (Sw1 - Sw7)
3.1.2.2. Parity (Sw8)
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1-1
2-1
2-1
2-2
3-1
3-1
3-1
3-1
3-1
3-2
3-3
3-3
3-4
3-4
3-4
A. Interface Description......................................Apx-1
A.1. RS232 Ports (Standard) .................................Apx-1
A.2. RS422 Ports (Optional) .................................Apx-1
B. Printable Prefix Codes.....................................Apx-2
C. Installing Add-On Modules
D. Specifications
E. Customer Service
F. FCC Statement
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Apx-3
Apx-5
Apx-6
Apx-7
List of Figures
2.1. Instrument Front Panel
2.2. Instrument Back Panel
A.1. RS232 Interface
A.2. RS422 Interface
C.1. Add-On Module Installation
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Apx-1
Apx-1
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Apx-3
2-1
2-2
i
1. Introduction
The CAS-161A Code Activated Switch enables a single RS232 Control port to switch between
16 to 64 ports via an ASCII code sequence.
The code sequence is a user-selectable Prefix code and a Port Select code. The Prefix code is
set via the Setup switch on the bottom of the unit. For added security, the Setup switch can be
set to require one, two, four or eight of the same Prefix codes. The Port Select code selects the
desired port and allows data to pass between it and the Control port until the next Prefix/Port
Select code is detected.
The CAS-161A also features a Broadcast mode which enables the Control port to transmit to
all ports.
Optional RS422 line drivers can be factory installed to increase data transmission up to one
mile.
The CAS-161A is field-expandable to 32, 48 or 64 ports by attaching up to three additional
Add-On Modules to the master unit. CAS-161A applications include:
Industrial Robotic and Numeric Control
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Remote Diagnostics
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Quality Control for Test Environment
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Laboratory Equipment Polling
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Electronic Rotary Switch Selection for Data Gathering
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Data Acquisition
Typographic Conventions
Throughout this User's Guide, typefaces and characters have been used to denote the following:
[Key] Text set in bold face and enclosed in square brackets indicates a specific
key. For example [Enter] or [Esc].
^ (e.g. ^V) Indicates a key combination used to invoke a command.
For example, the text “^V” (Control V) indicates the [Ctrl] key and the
[V] key must be pressed simultaneously.
COURIER FONT Indicates characters typed on the keyboard. For example ^Yk or ^V
1-1
2. Unit Description
Figure 2.1: Instrument Front Panel
2.1. Front Panel Indicators
À
PWR: (Power) Indicates power to the unit is ON.
Á TXD: (Transmit Data) Indicates data is being transmitted out pin 2 of the Control port
(MODEM Port). Indicates data is being received at pin 2 of the selected port.
 RXD: (Receive Data) Indicates data is being received at pin 3 of the Control port.
à RTS: (Request to Send) Indicates high RS232 signal at pin 4 (output) of the Control
port. Indicates high signal at pin 4 (input) of the selected port.
Ä CTS: (Clear to Send) Indicates a high RS232 signal received at pin 5 (input) of the
Control port.
Å ALL: Indicates Broadcast Mode is active, all ports open.
Æ SECTION Indicators: When optional Add-On Module(s) are present, indicators show
port connections on master or Add-On Modules as follows:
•
Section 1: Ports1-16selected on master unit.
•
Section 2: If second Module is present, indicates Ports 17 - 32 selected.
•
Section 3: If third Module is present, indicates Ports 33 - 48 selected.
•
Section 4: If fourth Module is present, indicates Ports 49 - 64 selected.
Example: If Section 4 LED and Active Port 2 LED are lit, this indicates port 50 is
selected (2 + 48 = 50).
Å ACTIVE PORT Indicators: These indicators are used with the previously mentioned
SECTION LEDs to indicate the port currently connected to the Control port.
2-1
CAS-161A Code Activated Switch, User's Guide Unit Description
Figure 2.2: Instrument Back Panel
2.2. Back Panel Components
À
Input Ports1-16: Ports labeled1-16are25-pin, female, RS232 connectors. Optional
RS422 connectors can be factory installed to increase data transmission distance. For a
description of the port interface, please refer to Appendix A.
Á MODEM Port (Control Port): A 25-pin, female, RS232 connector. For a description of
the port interface, please refer to Appendix A.
 AC Power: Power connector and ON/OFF switch. The unit can be jumper-selected for
either 115 or 230 VAC.
à SetUp Switches: (Not Shown) Two banks of DIP switches located on the underside of
the unit. The SetUp Switches are used to configure the prefix code, select baud rates and
parity, and set other features as described in Section 3.
2-2
3. Installation
3.1. Configure SetUp Switches
There are two banks of DIP switches located on the bottom of the CAS-161A unit. These
switches are used to configure the Prefix Code (command character), enable the Broadcast
Mode, and select the baud rate. Switch functions are summarized on the bottom of the unit and
in the sections that follow:
Note: Switch positions “1” and “0” are indicated on the bottom of the unit.
3.1.1. SetUp Switch Bank 1
The bank of switches located closest to the rear panel are used to select the Prefix Code
Repetition Value, Broadcast Mode, and baud rate.
3.1.1.1. Prefix Code Repetition Value (Sw1 - Sw4)
The Prefix Code informs the unit that the next character will be a command. In order to allow
the unit to adapt to a variety of applications, it is often useful to require that the Prefix Code be
repeated several times in order to be recognized. For example if the Prefix Code is ^V and the
Repetition Value is 4, then the sequence “^V^V^V^V” would be sent prior to a port selection
command.
Note: When transmitting binary data, it is recommended that the Repetition Value
be set at four or eight. This will decrease the possibility of random characters in
data being misinterpreted as commands.
Switch (Bank 1)
Prefix Code Repetition
1 x Prefix Code *
2 x Prefix Code
4 x Prefix Code
8 x Prefix Code
1234
1000
0100
0010
0001
* = Factory Setting
3.1.1.2. Broadcast Mode (Sw5)
On (1) forces all ports open. Data from the Control (MODEM) port is sent to all Input ports.
Useful for broadcasting to or controlling all Input devices. When enabled, concurrent data sent
by Input ports to the Control port will be jumbled together.
Broadcast Mode Sw5
Disable*
Enable
0
1
* = Factory Setting
3-1
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