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What is the difference between series C and series D on the HI 1769?

Last updated 11-05-2012 06:17

Question

What is the difference between series C and series D on the HI 1769WS and/or HI 1769-2WS?

Answer

There was the change to add the ROC into the modules between Series C & D. Here is a write up of what those changes entailed:

Firmware version 2.3 added the Rate of Change feature to the HI 1769WS and 1769-2WS modules. To add the RATE of Change we needed to relocate a couple of other data points in the input table. These changes in firmware revision 2.3 are:

INPUT TABLE:

Channel 0:
Word 3 is now the Firmware Rev (was word 13)
Word 9 is now the Calibration type (was word 12)
Words 12 & 13 are now the Rate of Change in units/min (new addition)

Channel 1 (if dual channel unit)
Word 19 is now the Firmware Rev (was word 29)
Word 25 is now the Calibration type (was word 28)
Words 28 & 29 are now the Rate of Change in units/min (new addition)

WRITEPARAM0:

Word 7 is now Rate of Change time base for channel 0, 1-1800 seconds (was unused)
Word 23 is now Rate of Change time base for channel 1, 1-1800 seconds (if dual channel unit) (was unused).

READPARAM0:

Word 7 is now Rate of Change time base (was unused)
Word 23 is now Rate of Change time base (if dual channel unit) (was unused).

CONFIGURATION TABLE:

Word 16 is now Rate of Change time base CH0 (was unused)
Word 40 is now Rate of Change time base CH1 (was unused)

You would need to be aware of the need place a valid value into word 7 (and 23 if dual scale module) when you do a WRITEPARAM0 command. This is the added parameter, ROC Time base. The default for this location is 0, and that is an invalid entry. You would need to change this entry to a value from 1 to 1800. If you do not make this change, then the WRITEPARAM0 command will fail.

If you have an earlier module programmed already and swap it out with a new, Series D, module, you would need to be aware of the changes above to have correct data for each location.

However, if you were not using the firmware revision or calibration type in your program, then you should not need to make any changes for the reading of the data.