Using Memobus (Modbus) Communications (Optional); Memobus (Modbus) Communications; Communication Specifications - YASKAWA VS mini J7 Series Instruction Manual

Using MEMOBUS (MODBUS) Communications
Serial communication is available with VS mini using programmable
controller (MEMOCON series) and MEMOBUS. In order to perform serial
communications, RS-485/422 interface card (optional) must be installed.
Refer to MEMOBUS Instruction Manual (Manual No.: TOEZ-C736-70.1)
for details of communications.

MEMOBUS (MODBUS) communications

MEMOBUS system is composed of a single master (PLC) and slaves (1
to 31 VS-mini units).
Communication between master and slave (serial communication) is
controlled according to the master program with the master initiating
communication and the slave responding.
The master sends a signal to one slave at a time. Each slave has a pre-
registered address No., and the master specifies the number and conduct
signal communications. The slave receives the communication to carry
out designated functions and reply to the master.
MEMOCON Series
Example of RS-485
communication
Communications specifications
Interface
Synchronization
Communication
parameters
Communication
protocol
Max. number of
inverters that can be
connected
74
VS mini J7
RS-422, RS-485
Asynchronous (Start-stop synchronization)
Baud rate : Selected from 2400/4800/9600/19200 bps
Data length : 8 bits fixed
Parity : Selected from even/odd/none
Stop bits : 1 bit fixed
MEMOBUS (MODBUS) (RTU mode only)
31 units (When using RS-485)
VS mini J7 VS mini J7