Yaskawa GPD 515-G5 Modbus RTU - Manual (Page 6)

1-2 GPD 515 and Serial Communication
Introduction to GPD 515 Modbus RTU Communication
This manual describes the set-up and protocol for Modbus Communication. The GPD 515 offers
RS-232D serial communication as a standard, and RS-485 as an option.
The Modbus RTU protocol requires that the controller communicates using a master-slave
technique, in which only one device (the master) can initiate transactions. The other devices (the
slaves) respond by supplying the requested data to the master, or by taking the action requested.
The GPD 515 drive must act in the slave mode.
A complete understanding of drive programming and operation is required before attempting
serial communication operation. A full discussion of programming and operation is covered in the
GPD 515 technical manual TM 4515.
GPD 515 / Modbus RTU Specifications
The data that may be sent or received from the drive consists of:
-Run
Command
-Frequency Reference
-Fault Contents
-Drive Status
-Drive Parameter Settings
The following table illustrates whether the serial communication specifications are fixed or user
selectable. If the specification is fixed, the fixed value is shown in the last column. If the
specification is selectable, the range of allowed values is shown in the last column.
Communication Specification Fixed or Selectable Range
Baud Rate Selectable 2400, 4800, or 9600 bps
Data Bit Fixed 8
Parity Selectable None, Even, or Odd
Stop Bit Fixed 1
Nodes RS-232D point-to-point only
Nodes Selectable for RS-485 maximum of 31 nodes
Standard RS-232D Serial Communication
The GPD 515 drive offers RS-232D serial communications as a standard feature of the drive.
RS-232D has a maximum transmission distance of 50 feet. RS-232D only allows point-to-point
communications. The specifications for wiring and pin outs for RS-232D are given in Chapter 2.