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OPERATIONS 4-4
MCC-545C PACKET DATA RADIO
12/2000
The third type of memory is EEPROM. It is nonvolatile and retains data even when power is
removed. Special access is required to program the EEPROM therefore it is not easily corrupted.
The MCC-545C can retain a copy of all the programmed configuration parameters in EEPROM.
However, EEPROM is limited to 10,000 write cycles per memory location so the MCC-545C
only writes to EEPROM using two special commands - "ID" and "SAVE". Only values that
have changed are written into EEPROM. A validation checksum is saved in the MCC-545C to
verify its data is correct.
When the MCC-545C ships from the factory it programmed with the following default
configuration: the Operator Port (port 0) is set for 9600 baud, 8 data bits, 1 stop bit, no parity,
ASCII protocol and no flow control. This provides a known starting point for communicating to
the unit from a terminal or computer. From this starting point, the user can program the unit ID
and other operational parameters and then use the "Save" command to write them to EEPROM.
As soon as the parameters are entered they take effect.
CAUTION
Once the software is rebooted or restart due to a crash or failure of the battery backup RAM, all
changes will be lost unless they were previously saved in EEPROM.
Saving and Restoring the Configuration - The Operation
1.
The software normally executes using the data and parameters stored in RAM. When the
unit is turned off, or power is disconnected, the RAM information will be maintained by
battery backup. When main power is restored the unit continues operation from RAM.
2.
The RAM contents will be lost under the following conditions:
(1) if the Reboot command is issued
(2) the white Reset button (S1) is pressed
(3) the internal battery backup is disconnected (by removing jumper JP1 while external
power is off)
(4) the NiCad battery fails or
(5) the software crashes and restarts.
The software will detect these events and will then recopy the configuration values from
EEPROM back into RAM when operation is resumed.
3.
The software will revert to the factory settings contained in the PROM if the contents of
the EEPROM become invalid.
The user should beware that it is possible to "get in trouble" using the configuration process. For
example, assume you accidentally set the protocol for the operator port to MSC. If you do not
have the ability to interface using MSC protocol you will immediately lose contact with the
Содержание MCC-545C
Страница 1: ...FCC ID BIB5450500101 EXHIBIT VIII OPERATION AND MAINTENANCE OF THE MCC 545C PACKET DATA RADIO...
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Страница 12: ...DESCRIPTION 2 7 O M of the MCC 545C PACKET DATA RADIO 12 2000...
Страница 18: ...DESCRIPTION 2 13 O M of the MCC 545C PACKET DATA RADIO 12 2000 MCC 545C OUTLINE DRAWING FIGURE 2 3...
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