Cooper Instruments & Systems DFI 200 Hand Held Indicator - Manual (Page 14)

CF 112 14 Version 3.1-0
Note: each external memory device should be allocated a unit address, see
function. Valid addresses are
1 to 250. If the Unit function indicates an address of 255 then this indicates that the memory device has not been
given an address. The same address can be allocated to more than one memory device and the address of a
device can be changed at any time. The setting of individual unit addresses simply allows identification of the load
cell by viewing the Unit function.
If the error message is seen on attaching the external memory this error message means that the
DFI 200 has recognized that an external memory is connected but cannot read from it. Usually the cause is that the
address of the chip is 255. To overcome this, follow the procedure below.
1. Switch on the DFI 200 by pressing the On Off pushbutton
2. When the unit has powered up press then release F then press the Max (UP) and Min (DOWN) buttons
simultaneously, the display should show the message FUNC momentarily
3. At to the
function select
4. Go to the function and select an address other than 255
5. Continue pressing and releasing the F button until the message is seen
The external memory stores the unit address, calibration slope and zero offset values and these are read by the
DFI 200 when it is connected to the external memory. The scaling values are used to display the stored calibration
for the load cell to which the external memory is connected. The external memory does not return
and
values to the DFI 200 therefore the and values in the DFI 200 will be those of the last cell
calibrated, not necessarily those of the cell connected. Do not view the and settings when external
memory is connected unless you wish to recalibrate the load cell since the calibration slope information for these
settings will be overwrite the calibration slope in the external memory chip.
See Chapter 1 for details of electrical wiring for the memory device. Calibration and setup with external memory.
The calibration and setup procedures are identical those described in the “Explanation of Functions” chapter. If
connected to a load cell with an external memory device then you simply need to ensure that the channel you wish
to calibrate (
) is selected prior to any calibration or setup. The channel should automatically be
selected when the DFI 200 detects that a memory device is connected.
Taking readings with external memory: Once the load cell with external memory is connected to the DFI 200 the
instrument will automatically display the calibrated scaling figures for that load cell. Simply ensure that the required
channel (
) is selected prior to taking a reading. The channel should automatically be selected when
the DFI 200 detects that a memory device is connected.