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ensure proper transfer, power should not be turned off until this response is con-
firmed.
Host computer
E5ZD
Set via communications
Communications processor
Received data transferred to RAM
RAM
Erased when
power is inter-
rupted.
CPU
Controlled according to
parameters in RAM
Parameters automatically
transferred from EEPROM
to RAM when power is
turned ON.
Parameters transferred from
RAM to EEPROM using WE
command.
EEPROM
Parameters preserved
even when power is in-
terrupted.
Parameters
Parameters
Parameters
Parameters
As shown above, the parameters stored in EEPROM are transferred to RAM
each time the E5ZD is turned ON. If RAM parameters are changed without
re-transferring the new values to EEPROM using WE, the new values will be lost
and the old values will again be transferred to RAM the next time power is turned
ON.
When preserving parameters in EEPROM, the response block sent after send-
ing WE should be checked to confirm proper transfer before turning off E5ZD
power. Transfer to EEPROM can be confirmed by checking the EEPROM Trans-
fer flag in the response to the Measure Temperature Read Command (RX).
EEPROM overwrite life limited to about 10,000 times. Needless use of WE
should thus be avoided. There is essentially no limit to the overwrite life of RAM.
Parameter Backup
Section 3-4
Содержание E5ZD
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