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Memobus Communications
îš‹ MEMOBUS Communications Configuration
The serial communication can be performed between one PC and one inverter in order to read / write parame-
ters or monitor the drive. The inverter can not be controlled by Memobus communications.
To use the communications port the operator panel must be removed from the inverter. The operator panel
connector on the inverter side has to be connected to the serial RS-232 port of the PC/PLC.
îš„Communications Specifications
The MEMOBUS communications specifications are shown in the following table.
îš„Memobus Operations
MEMOBUS communications can perform the following operations:
• Monitoring operation status of the inverter
• Setting and reading parameters (for the parameter register numbers refer to the L7Z manual)
îš‹ Message Content
îš„Message Format
In MEMOBUS communications, the master sends commands to the slave, and the slave responds. The mes-
sage format is configured for both sending and receiving as shown below, and the length of data packets
depends on the command (function) content.
Slave Address
The slave address can not be set in the inverter. The slave address field in the message can contain any address
from 0 to 31.
Item Specifications
Interface RS-232 (not isolated)
Communications Parameters
Baud rate: 9,600 bps
Data length: 8 bits fixed
Parity: none
Stop bits: 1 bit fixed
Communications Protocol MEMOBUS
Number of Connectable Units 1
Slave address
Function code
Data
Error check
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