Western Telematic Switch CAS 161A User Manual

CAS-161A  
Code Activated Switch  
User’s Guide  
5 Sterling  
Irvine  
California 92618  
(949) 586-9950  
Fax: (949) 583-9514  
Toll Free: 1-800-854-7226  
 
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  
· Remote Diagnostics  
· Quality Control for Test Environment  
· Laboratory Equipment Polling  
· Electronic Rotary Switch Selection for Data Gathering  
· 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  
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: Ports 1 - 16 selected 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  
 
2.2. Back Panel Components  
À Input Ports 1 - 16: Ports labeled 1 - 16 are 25-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
2
3
4
* = 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  
* = Factory Setting  
3-1  
 
3.1.1.3. Baud Rate Select (Sw6 - Sw8)  
Selects the operating baud rate; from 150 to 19.2K baud.  
Switch (Bank 1)  
Baud Rate  
6
7
8
* = Factory Setting  
3-2  
 
3.1.2. SetUp Switch Bank 2  
The bank of DIP switches located closest to the front panel are used to select the Prefix Code  
character and set the parity.  
3.1.2.1. Prefix Code (Sw1 - Sw7)  
As mentioned previously, the Prefix Code informs the unit that the next character will be a  
command. The Prefix code can be any ASCII character. However, since it is passed on to the  
connected device, it is recommended to use a non-printable character. The factory default is  
^V (Control V). Please refer to the following table when selecting a Prefix Code.  
(US)  
Factory Setting = ^V  
3-3  
 
3.1.2.2. Parity (Sw8)  
Parity can be set to Even, Mark, Odd, None, or Space.  
Switch 8 (Bank 2)  
1 (On) 0 (Off)  
Parity  
3.2. Connect Power Cable  
1. Make certain the power switch is in the OFF position.  
2. Attach one end of the power cable to the AC power connector on the CAS-161A. Attach  
the other end to a grounded wall outlet.  
3.3. Connect Data Cables  
Note: Check to make certain all data cables are compatible. Refer to the Appendix  
for a description of the interface.  
1. Make certain the power switch is OFF.  
2. Connect the data cables from the devices to be controlled to the ports labeled 1 - 16 on  
the master unit.  
If your installation includes optional CAS-161A Add-On Modules, install the additional  
Modules as described in Appendix C, and then connect ports 17 - 64.  
3. Connect the cable from your control device (PC, modem, etc.) to the MODEM connector  
on the CAS-161A.  
3-4  
 
4. Port Selection  
4.1. Selecting a Port  
1. After completing the installation procedure, flip the power switch on the back of the unit  
to ON.  
Note: Upon each power-up the unit will reset and all ports will be closed.  
2. Refer to the Port Select Code Chart below and find the letter representing the port you  
wish to connect to.  
Module 1  
Port Code  
Module 2  
Port Code  
Module 3  
Port Code  
Module 4  
Port Code  
3. Go to the PC or terminal connected to the Control (Modem) Port. Start your  
communications program. Enter the Prefix Code followed by the appropriate Port Select  
Code.  
The Control port connects to the selected port and remains connected until another code  
sequence is issued.  
Note:  
• The Prefix code is sent out the selected port. The Port Select code is not sent out  
the selected port because all ports close briefly upon receipt of the Prefix code.  
• The selected port opens during the Port Select code's stop bit time. All data  
following the Port Select code is sent out the selected port including the next  
Prefix code.  
4-1  
 
Examples:  
Assume the Prefix Code is ^V and the Prefix Code Repetition Value is 4. To connect to Port  
14, use the following command:  
^V^V^V^VM  
Assume the Prefix Code is ^Y and the Prefix Code Repetition Value is 1. To connect to Port  
44, use the following command:  
^Yk  
4.2. Closing/Opening All Ports  
1. To close all ports at once, enter the Prefix code, followed by a space.  
2. To open all ports at once, enter the Prefix code, followed by ^X (Control X) (CAN)  
Example: Assume the Prefix Code is ^V and the Prefix Code Repetition Value is 2. To open  
all ports at once, use the following command:  
^V^V^X  
4-2  
 
A. Interface Description  
A.1. RS232 Ports (Standard)  
A.2. RS422 Ports (Optional)  
Note: Handshake signals are not passed. Pins 1 - 13 are open.  
Apx-1  
 
B. Printable Prefix Codes  
Since the Prefix code is transmitted through the opened port, it is best to select a non-printable  
Prefix Code. The procedure for selecting the Prefix Code is described in Section 3. If your  
application requires a printable code, refer to the ASCII code chart below. Remember:  
· Switch positions 1 - 7 correspond to ASC bits B1 - B7 on the chart.  
· Switch positions should be ON for a 0 and OFF for a 1.  
Example: To select the “@” character for a printable Prefix code: B1 - B7 on the chart shows 0  
0 0 0 0 0 1 for “@”. Therefore, Sw1 - Sw6 should be ON and Sw7 OFF.  
Apx-2  
 
C. Installing Add-On Modules  
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. Each Add-On Module Kit includes the following:  
· 1 ea.  
· 2 ea.  
· 1 ea.  
· 1 ea.  
Add-On Module w/ six-wire power cable  
Connecting Plates  
Left Rack-Mount Bracket (Style-2)  
Right Rack-Mount Bracket (Style-2)  
· 18 ea. 6-32 x 3/8” Screws  
To install Add-On Modules, refer to Figure C.1 below and proceed as follows:  
Note: If your unit has a stand-alone top cover, a Style-1 Rack-Mount Kit is also  
required for the top Module.  
Apx-3  
 
1. Remove the instrument top cover. If your unit has a stand-alone top cover, remove the  
cover; the stand-alone cover is no longer required. If your unit has a Rack-Mount Kit,  
remove the Rack-Mount Cover, Left and Right Rack-Mount Brackets (Style 1), and  
screws. Save these parts, they will be used later.  
2. Locate and unroll the ribbon cable (A) from inside the Master Unit. Hold the Add-On  
Module (B) over the Master Unit (C). Feed the ribbon cable up through the bottom of the  
Add-On Module. Plug the ribbon cable’s first connector into the Add-On Module’s P2  
connector.  
3. Plug the Add-On Module’s six-wire power cable at P1A (D) into the Master Unit’s P1B  
(Power Out) receptacle. Set the Add-On Module in place. Locate the Sw3 DIP switch  
inside the Add-On Module. Refer to the table below, and change switches to match the  
Add-On Module.  
Sw3  
Add-On Module  
Ports  
1
2
3
4
4. Repeat Step 3 to install any additional Add-On Modules (E and F). Refer to the table  
above and make the appropriate DIP switch changes to match each Module/Section.  
5. Install the Rack-Mount Top Cover (G) and Left and Right Style-1 Brackets (H) (removed  
in Step 1) on the top Add-On Module. Attach only the two upper screws at this time.  
6. Attach the Left and Right Style-2 Rack-Mount Brackets (I) to the remaining Modules  
and/or Master Unit. Make sure the two threaded holes on each bracket face up. Secure  
each bracket at the lower holes using the screws provided.  
7. Place the Connecting Plates (J) over the Rack-Mount Brackets as shown in Figure 3.1.  
The Connecting Plates must be installed with the plate flanges facing out, and with two  
screw holes on the top edge and four screw holes on the bottom. Secure each Connecting  
Plate with four screws. Repeat this step to secure any remaining Modules.  
Apx-4  
 
D. Specifications  
Coding: ASCII, Asynchronous  
Baud Rate: 300 to 19.2K baud, Switch Selectable  
Interface: RS232, 25-pin connectors  
Lines Switched: 2,3,4 and 5. Pins 6 and 8 of all Input ports follow Pin 6 of the Control port.  
Power: 90 VAC to 130 VAC (jumper-selectable),  
180 VAC to 260 VAC, 47 to 450 Hz.  
Ambient Temp: 25°  
Operating Temp: 0° C to 38°  
Ventilation: 2" all sides  
Size: 17.25" x 3.50" x 9.00" (W x H x D)  
Weight: Master Unit: 7 lbs, Each Add-On Module: 4 lbs  
Apx-5  
 
E. Customer Service  
Customer Service hours are from 8:00 AM to 5:00 PM, PST, Monday through Friday. When  
calling, please be prepared to give the name and make of the unit, its serial number and a  
description of its symptoms. If the unit should need to be returned for factory repair it must be  
accompanied by a Return Authorization number from Customer Service.  
WTI Customer Service  
5 Sterling  
Irvine, California 92618  
Phone: 949-586-9950  
Toll Free: 1-800-854-7226  
Fax: 949-583-9514  
Apx-6  
 
F. FCC Statement  
WARNING: This equipment generates, uses and can radiate 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 specifications in Subpart J of Part 15 of 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 may cause  
interference, in which case the user at his/her 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:  
· Reorient the receiving antenna.  
· Relocate the equipment with respect to the receiver.  
· Move the equipment away from the receiver.  
· Plug the equipment into a different outlet so that the equipment and receiver are on  
different branch outlets.  
· Ensure that the mounting screws, attachment connector screws and ground wires are tightly  
secured.  
· Ensure that good quality, shielded and grounded cables are used for data transmission.  
You may find the following booklet prepared by the Federal Communications Commission  
helpful:  
How to Identify and Resolve Radio-TV Interference Problems  
This booklet is available from the US Government Printing Office, Washington, DC 20402,  
Stock No. 044-000-00345-4.  
Apx-7  
 
Trademark and Copyright Information  
WTI, WTI logo and Western Telematic are trademarks of Western Telematic Inc. All other  
product names mentioned in this publication are trademarks or registered trademarks of their  
respective companies.  
Information and descriptions contained herein are the property of Western Telematic Inc. Such  
information and descriptions may not be copied, disseminated, or distributed without the  
express written consent of Western Telematic Inc.  
Copyright © Western Telematic Inc. 1990, 1992, 1997, 2000 All rights reserved.  
Printed in the United States of America.  
September 1997, June 2000  
Part Number: 12114 Revision: D  
Apx-8  
 

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