CF 126
1
Nov 2001
Chapter 1 Introduction
1.1 About This Manual
1.1.1 Scope
This manual contains information about the wiring and protocol used for serial communications SC series
instruments. This series includes the models DFI 1550, DFI 1650, DFI 1650PT, and DFI 1650-3004.
Nearly all of the DFI’s features available via its front panel switches, indicators, display and rear panel
connectors are also available through its serial communications interface. This guide is primarily intended
for those DFI users already familiar with RS-232 and RS-422/RS- 485 serial communications interfaces
and who wish to use the DFI remotely using them. If you are not familiar with serial communications terms
such as "baud rate" and "ASCII character", you may wish to review the subject before using this guide.
The information and programs contained in this manual are believed to be correct, however no warranty
is expressed or implied including fitness for a particular purpose. The capabilities of the instrument are
continuously being improved upon, and the information in this manual is subject to change without notice.
1.1.2 Conventions
This manual uses the following conventions to present information:
[TEXT IN BRACKETS]
The label of a front panel button.
DISPLAY
Text that appears on the display, such as error messages or menu items.
->
Indicates that what follows is an item from a sub-menu, such as SYSTEM
MENU -> DIAGNOSTICS.
DATA
Commands sent to or replies from the instrument
↵
The carriage-return character, ASCII code decimal 13
1.2 Related Documents
Instruction Manual
The Serial Communications Guide explains the setup, features and operation of 3rd generation DFI
instruments.
1.3 What is the DFI Series?
The DFI Series of Signal Conditioners/Indicators are versatile, multi-channel devices designed to operate
with many different types of sensors. Several different 9 chassis types, Input channels, and Output
channels are available to allow the configuration of a DFI instrument to meet a variety of measurement
and control needs. The operation of a DFI instrument is based on digital technology to provide improved
accuracy, superior ease of setup, and a wealth of features.
1.3.1 Features
The main features of the DFI Series are:
•
Four alarm limits (optional sixteen), with versatile setup (not available on Model DFI 1550).
•
Automatic setup, calibration, and scaling of strain-gage sensors through the use of Signature
Calibration TM
•
Field selectable, digital, low-pass filtering ("damping") on each Input channel
•
Up to ±50,000 part resolution
•
Field selectable five-, six- or seven-digit (9,999,999 maximum) display
•
RS-232 communications standard (RS-485 optional)
•
Local or remote setup using the RS-232 or RS-422/RS-485 port
•
Push-button on/off tare feature
•
No knobs or adjustments
1.3.2 Chassis Models
Several models (i.e. chassis types) are available:
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