CF 126
3
Nov 2001
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Full-scale mV/V: The full-scale millivolt-per-volt (mV/V) rating of the transducer when its full load
is applied; also called "calibration factor".
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Shunt-Cal mV/V: The millivolt-per-volt output of the transducer when the shunt calibration resistor
is placed across its -SIGNAL and -EXCITATION leads.
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Shunt Resistance: The resistance value, in Ohms, that was used to obtain the shunt-cal mV/V
value above.
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Full-Scale Value: The full-scale value of the transducer, in engineering units.
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Engineering Units: The engineering units that the transducer is calibrated in (i.e. pounds, grams,
Pascals, inches of water, etc.)
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Serial Number: The serial number of the transducer.
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Excitation Voltage: The magnitude and type of signal used to excite the transducer.
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Linearization Points (optional): These can be used by an instrument using Shunt Calibration or
Millivolt-per-Volt Calibration to correct any non-linearity in the transducer and thus improve the
accuracy of the system. An additional "multiple-point calibration" can be purchased with the
transducer that allows linearity correction information to be placed into its Calibration module.
Chapter 2 Getting Started Quickly
2.1 Introduction
This chapter explains how to quickly establish communications with a DFI Series instrument equipped
with the standard RS-232 interface. It assumes that you are very familiar with serial communications and
have access to a terminal emulator program.
Most computers are equipped with either a standard 25-pin male or an IBM 9-pin male RS-232 serial
connector.
Remember that all personal computer serial ports have male connectors! Parallel printer ports have
female connectors.
RS-422 or RS-485 serial ports are
NOT STANDARD EQUIPMENT
on PC computers!
2.2 Locate Required Parts and Information
The following items are required quickly establish communications with a DFI Series instrument equipped
with the standard RS-232 interface.
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DFI Series instrument
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A computer that is running a terminal emulator program that you are familiar with.
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25-pin D-sub pass-through male/female cable, such Radio Shack pin 26-240.
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If your computer's serial port has a 9-pin D-sub male connector, an adapter to convert the
computer's male 9-pin RS-232 port to a standard male 25-pin port. Example: Radio Shack pin 26-
209.
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The Customer Information Sheet that shipped with your instrument. Examine it to confirm that the
instrument is equipped with the standard RS-232 interface.
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Power cord for the instrument.
2.3 Connect the Instrument to the Computer's RS-232 Serial Port
Connect the 25-pin serial cable (female connector) or 25-pin serial cable plus 9-pin adapter (female
connector) to the computer's RS-232 serial port (male connector). Determine if this port is called out as
COM 1 or COM2.
Connect the 25-pin cable (male connector) to the instrument's System connector (female connector).
In nearly all situations, a gender changer device is not required! Do not connect the serial
communications cable to your computer's female printer port.
2.4 Turn on the Instrument
Connect the power cord between the instrument power source and the instrument, and turn the OnlOff
switch on the back of the instrument to the On position.
