GPD315 Modbus RTU Technical Manual TM 4325
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8
“ENTER” Command
The GPD315 has two types of memory: ‘Volatile’ and ‘Non-volatile’. Data held in the Volatile
memory will be lost when power is removed from the drive. Data held in the Non-volatile memory
will be retained when power is removed from the drive. It is necessary to follow each block of
parameters with the ENTER command in order to transfer data form Volatile to Non-volatile
memory. To send an ENTER command, send a value of 0 to address 900h. See warning below.
Command Data:
The command registers (000H to 009H) are stored in Volatile memory. When writing to a
command register the new data becomes active immediately. In the case of a power loss all data
stored in these registers will be lost.
Monitor Data:
The monitor registers (020H to 03DH) are stored in Volatile memory. These registers are read
only. Any data read from the monitor registers will not be retained during a power loss.
Parameter Data:
The parameter registers (101H to 1D2H) are stored in Non-volatile memory. When writing new
data to parameter registers, an ENTER command must be sent for the new data to saved to
non-volatile memory. To send an ENTER command, send a value of 0 to address 900h. See
warning below.
Some parameter registers may only be written to when the drive is stopped. These are called the
non-run operative parameters.
WARNING
Use the ENTER (0900H) command only when necessary! The life of the EEPROM (Non-volatile
memory) on the GPD315 will only support a finite number of operations. This means that the
ENTER command can only be used a limited number of times. After the specified number of
operations, the EEPROM may fault (ERR) requiring replacement of the GPD315 control board.
