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28 CAS User’s Guide
Installation
Serial Communications
The CAS is factory-configured for RS-232 communications. However,
the communications are jumper-selectable, so you can switch between
RS-232 and RS-485. (See Configuring Communications below.) You
can also order a communications cable from Watlow Anafaze or make
your own cable.
RS-232 Interface
With RS-232 communications, you can connect the CAS System
directly to the serial communications connector on an IBM-PC or
compatible computer. (PC-compatible computers typically use RS-232
communications.) The RS-232 interface is a standard three-wire
interface. (See the table below for connection information. Some
computers reverse transmit (TX) and receive (RX), so check your
computer manual to verify your connections.)
You can use RS-232 or RS-485 communications in these situations:
•
When you are using local communications (up to 50 feet).
•
When you are using a single CAS system.
If you use RS-232 communications with grounded thermocouples, use
an optical isolator between the system and the computer.
This table shows RS-232 connections for 25-pin and 9-pin connectors.
RS-485 Interface
•
If you use more than one CAS System, you must use RS-485 com-
munications.
•
If you have connected the CAS System to a computer more than 50
feet away, Watlow Anafaze recommends that you use RS-485 com-
munications.
If you use RS-485 communications, attach an optically isolated RS-232
to RS-485 converter to the computer. You can use an internal converter
card or an external plug-in converter.
The diagram below shows the recommended system hookup. To avoid
ground loops, it uses an optically isolated RS-232 to RS-485 converter
at the host computer. It is powered from the CAS System's power source
or from a secure, isolated power supply.
DB 25
Connector
DB 9
Connector
CAS Back TB
Anafaze
Cable
RX Pin 3 RX Pin 2 TX Pin 26 White
TX Pin 2 TX Pin 3 RX Pin 25 Red
GND Pin 7 GND Pin 5 GND Pin 23 Black
- User ’s Guide 1
- Warranty 2
- Contents 3
- CAS User’s Guide iii 5
- Overview 7
- System Diagram 8
- Parts List 8
- 10
- Introduction 11
- Specifications 13
- Digital Inputs 14
- Digital Outputs 14
- System Digital Outputs 14
- Miscellaneous Specifications 15
- 6 CAS User’s Guide 16
- Installation 17
- Precautions and Warnings 18
- Recommended Tools 19
- CAS Mounting Procedure 20
- TB-50 Mounting Instructions 21
- Grounding 24
- Thermocouple Wiring 24
- Input Wiring 24
- Communications Wiring 25
- Wiring: Noise Suppression 26
- General Wiring 27
- Connections Test 28
- Wiring Outputs 29
- Using the Cable Tie Wraps 30
- Alarm Output Connections 31
- Watchdog Timer 31
- TB-50 Connections 32
- Input Scaling 33
- Scaling Values 34
- Scaling and Calibration 35
- T/C Inputs 36
- Connecting Thermocouples 36
- Current Inputs 36
- Voltage Inputs 37
- Unused Inputs 37
- Serial Communications 38
- JU 1JU 1 39
- Configuring Communications 40
- Recommended Wire Gauges 41
- 32 CAS User’s Guide 42
- Using the CAS 43
- Front Panel 44
- Single Channel Display 46
- Job Display 47
- Change Setpoint 48
- Acknowledging an Alarm 49
- Resetting an Alarm 49
- 40 CAS User’s Guide 50
- How to Enter the Setup Menus 51
- How to Edit a Menu 51
- CAS Menus 52
- Setup Global Parameters Menu 53
- Save Setup to Job 54
- Job Select Inputs 54
- Job Select Input Polarity 55
- Startup Alarm Delay 55
- Keyboard Lock Status 56
- Scanner Address 56
- Communications Error Checking 56
- Communications Baud Rate 57
- Allen-Bradley Protocol 57
- AC Line Frequency 57
- Digital Output Polarity 58
- EPROM Information 58
- Setup Channel Inputs 59
- Pulse Sample Time 60
- Channel Name 60
- Input Units 61
- Input Reading Offset 61
- Linear Scaling Menus 62
- Variable 63
- InputR eading 63
- Display Format 64
- High Process Value 64
- High Reading 65
- Low Process Value 65
- Low Reading 66
- Input Filter 66
- Setup Channel Alarms 67
- Alarm Delay 69
- High Process Alarm Setpoint 69
- High Process Alarm Type 69
- Deviation Alarm Value 70
- High Deviation Alarm Type 70
- Low Deviation Alarm Type 71
- Low Process Alarm Setpoint 72
- Low Process Alarm Type 72
- Alarm Deadband 73
- Manual I/O Test 75
- Digital Output Test 76
- Keypad Test 76
- Troubleshooting 77
- Manual System Reset 78
- Returning the Unit 78
- TB-50 Test 79
- Checking an Analog Input 79
- Checking Digital I/O 79
- Digital Input Test 80
- Computer Problems 81
- Ground Loops 82
- Software Problems 82
- User-Written Software 82
- Changing the EPROM 83
- Appendix: Linear Scaling 85
- Examples 85
- Example 2 86
- Example 3 87
- 78 CAS User’s Guide 88
- Glossary 89
- 88 CAS User’s Guide 98
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