Cooper Instruments & Systems DFI INFINITY Digital Force Indicator/Controller - Manual (Page 12)

Pressing the ‘MENU’ button saves your choices and advances to “ADDRES”. This is used to set in an RS-485
device from address 0 to 199 and is accomplished by pressing the ‘MIN’ button to advance the digit position and
pressing ‘MAX’ button to change values. Note: For RS-232, skip over this by pressing the ‘MENU’ button.
If the communication link is in place, no more pushbutton programming is needed: the computer takes over at
this point. Follow the prompts and selections on that screen.
3.2 Diskette-Driven Computer Control
The next three communications bytes will now be set via the communications link. If not already in place,
complete the link by plugging in the telephone jack (using the furnished male/male cable and optional computer-
card-to-telephone-jack adapter as required.) Apply power.
Refer to the DISKETTE instructions and your computer screen. The DISKETTE program will prompt your
selections of message format. At the end of this programming, the link will advance your meter to the RUN
mode and your measurements will begin.
If the system performance is satisfactory with the diskette-driven controls, you may SKIP the rest of this Guide
(which is dedicated to the data needed for custom control and data acquisition program generation).
4. DEFINITIONS
This guide uses some abbreviations and compact wording to signify devices and concepts with detailed
descriptions. Significant items are:
4.1 Meter Or DCE
The term “METER” signifies one or more meters (or devices with compatible communications) which respond to
the commands (requests) of a controller device such as a computer. Such meters are classified as “DCE”
devices, from the older “Data Communication Equipment” telephone specifications.
4.2 Computer Or DTE
These descriptors signify the device controlling the communications, such as a computer (“HOST” device) or
programmable controller. Telephony specifications refer to controllers as “Data Terminal Equipment” or DTEs.
4.3 Point-To-Point
Direct connection between two (and only two) devices for data exchange, such as the meter and your digital
computer. No addresses are used unless the meter is programmed for a “one-meter bus”.
4.4 Multipoint (Multi-Drop)
Shared wiring for the DTE and more than on DCE, designates a “BUS”. Several panel meters and a personal
computer can share a bus, with the computer service as the controller. The controller can acquire data by
transmitting the preassigned address for a meter followed by a command for the meter to send selected
information. When used with the meter, up to 31 meters can share a bus (with addresses from 01 to decimal
199); all meters receive the data when the address is “00”.
4.5 Simplex
A channel (path, typically a twisted pair of wires) with unidirectional data flow.
4.6 Half Duplex
A channel (e.g., twisted pair) with bi-directional data flow, but only in one direction at a time.
CF 125 INFINITY SC GUIDE 8 M1519/N/0605