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9. TEDS SIGNAL CONDITIONER IN TEDS MODE
9.1 INTRODUCTION
The DPM-3 is a TEDS IEEE 1451.4 Plug and Play Smart Load Cell Meter. TEDS, or
Transducer Electronic Data Sheet, is a set of electronic data in a standardized format
defined within the IEEE 1451.4 standard that is stored in an EEPROM. This data specifies
what type of sensor is present, describes its interface, and gives technical information such
as sensitivity, bridge type, excitation, etc. The DPM-3 will automatically detect when a
TEDS IEEE 1451.4 compliant Load Cell / Torque Sensor is connected to it, each and every
time, by a built in EEPROM detector. Once a TEDS Sensor has been detected, the DPM-3
displays a front panel TEDS indicator light, reads the EEPROM and stores the information
in memory and performs an automatic configuration. The automatic system configuration
function performs all steps needed to calibrate the TEDS IEEE 1451.4 compliant Load Cell
/ Torque Sensor and DPM-3 as a system, including selecting the correct sensor excitation.
Using the DPM-3 with a TEDS IEEE 1451.4 compliant Load Cell / Torque Sensor is as
easy as plugging a mouse into a computer, making it a true plug and play experience.
9.2 SCALING
When a DPM-3 connected to a TEDS transducer is powered on, the meter reads the data
stored in the transducer. The excitation supply is automatically set to the correct value and
the DPM-3 calculates the correct scaling to calibrate the meter and the transducer as a
system. The jumper on the signal conditioner board must be set for the 50 mV range. See
Section 13.1. If the Maximum Physical Value of the TEDS sensor exceeds 100,000, the
calculated scale and offset are divided by 10 and the reading is in 10's of units.
If the full scale of the transducer is 50 pounds, the meter will display 50 at full scale output.
If more resolution is desired, the meter decimal point can be set so that the meter will read
50.0, 50.00, or 50.000. In this example, if another unit of measure, such as kilograms, is
desired, there are two alternatives.
If the meter has a serial communication board installed, TEDS Reader_Editor software
can be used (see Section 24 "Accessories" for information). The electronic data sheet for
your transducer can then be read electronically and be displayed on a computer screen.
The values can be modified (e.g., to display kilograms instead of pounds), and then written
back to the transducer.
The meter Menu item "Tare," digits 4 and 5, can be set to 1 to configure the meter as a
non-TEDS transducer type.
9.3 Error Messages
If there is a problem with the TEDS connection between the meter and the TEDS trans-
ducer, one of the following error messages will be displayed at power on or when plugging
in a TEDS transducer while the power is on:
Err 1 - TEDS data line shorted
Err 2 - No Presence pulse from TEDS
Err 3 - Improper Presence pulse width
Err 4 - TEDS family code in ROM in error
Err 5 - TEDS checksum error in the first or second 32 bytes
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