YASKAWA GPD 515/G5 Modbus RTU User manual
Technical References / Technical Support i
Technical References
Refer to the following publications for further information about the GPD 515/G5:
•GPD 515/G5 Technical Manual
Publication TM 4515
•GPD 515/G5 RS-232C/485 Interface Card Installation Sheet
Publication 02Y00025-0401
Refer to the following Modicon publication for technical information on Modbus RTU protocol:
•Modicon Modbus Protocol Reference Guide
Publication PI-MBUS-300 Rev. D
Technical Support
Technical Support Center-
Provide telephone assistance related to installation, start-up, programming, and
troubleshooting drives and communication products. For technical phone support
call 1-800-541-0939.
Contents 1
CONTENTS
Technical References / Technical Support i
Contents 1
Chapter 1 GPD 515/G5 and Serial Communication 1-1
Introduction to GPD 515 Modbus RTU Communication 1-2
Standard RS-232D Serial Communication 1-2
The RS-232D to RS-485 Converter Board 1-3
Figure 1-1. The CM085 Board 1-3
Chapter 2 RS-232D Serial Communication 2-1
RS-232D Serial Communication 2-2
Figure 2-1. RS-232D Pin-out at 6CN Connector 2-2
Chapter 3 Installation of CM085 Board 3-1
Installation Procedure 3-2
Figure 3-1. Position of the CM085 Board
on the GPD 515 Drive 3-2
Chapter 4 Wiring of the CM085 Board 4-1
Connection of Multiple Drives 4-2
Figure 4-1. Interconnection Diagram 4-2
Wiring Instructions 4-3
Figure 4-2. Twisted Shielded Wire Termination 4-3
Table 4-1. Functions of Terminal Block TC1 4-3
Table 4-2. Applicable Wire Sizes for Terminal Block TC1 4-3
Terminating Resistors 4-4
Figure 4-3. SW1 Location on the CM085 Board 4-4
Chapter 5 Setting GPD 515 Parameters for Communication 5-1
Run/Stop and Frequency Selection 5-2
Communication Set up Parameters 5-3
“ENTER” Command 5-5
Chapter 6 The Message Format 6-1
Message Functions 6-2
Read Multiple Registers - 03h 6-3
Loop-back Test - 08h 6-6
Write Multiple Registers - 10h 6-8
No Response Message 6-11
CRC-16 6-11
Chapter 7 Registers 7-1
Simultaneous Broadcast Registers 7-2
Command Registers 7-3
Monitor Registers 7-4
Drive Parameter Registers 7-7
Special Registers 7-17
Contents 2
Chapter 8 Error Codes and Troubleshooting 8-1
Communication Error (CE) 8-2
Modbus Error Codes 8-2
Figure 8-1. Response Message (Fault) 8-2
GPD Failure Codes 8-3
Chapter 9 Command Priority 9-1
Command Priority 9-2
Table 9-1. Set up for Serial Communication Control 9-3
Table 9-2. Set up for External Terminals Control 9-4
Table 9-3. Set up for Digital Operator Control 9-5
Table 9-4. Set up for Option Board Control 9-6
Appendix A Product Specifications A-1
Appendix B Spare Parts List B-1
GPD 515 and Serial Communication 1-1
Chapter 1
GPD 515/G5 and Serial Communication
•Introduction to GPD 515/G5 Modbus RTU Communication
•Standard RS-232D Serial Communication
•The RS-232D to RS-485 Converter Board
•Figure 1-1. The CM085 Board
Note: The AC Drive referenced in this manual may be named GPD
515, G5, or GPD 515/G5. These are physically the same drive. This
manual will use the name GPD 515 hereafter.
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.
GPD 515 and Serial Communication 1-3
The RS-232D to RS-485 Converter Board
The GPD 515 offers RS-485 serial communications as an option. RS-485 allows a maximum
transmission distance of 4000 feet. RS-485 allows multidrop (multiple devices) communication.
To obtain RS-485 communications an optional converter board must be purchased. This
RS-232D to RS-485 Converter Board is represented by the MagneTek part number CM085.
Read this manual thoroughly before installation, operation, maintenance, and inspection of the
CM085 Option Board.
CAUTION
The CM085 option board employs CMOS technology which may be damaged by static electricity.
Use proper electrostatic discharge (ESD) procedures when handling this board.
The CM085 board is used to convert the drive’s RS-232D standard function to offer RS-485
interface. The following diagram illustrates the CM085 board. (The figure is not actual size.)
Figure 1-1. The CM085 Board
RS-232D Serial Communication 2-1
Chapter 2
RS-232D Serial Communication
•RS-232D Serial Communication
•Figure 2-1. RS-232D Pin-out at 6CN Connector
2-2 RS-232D Communication
RS-232D Serial Communication
RS-232D Serial Communication is accessed through connector 6CN on the GPD 515ís control
board. Pin 1 on the 6CN connector is for the transmission of data, Pin 2 is for the receipt of data,
and pin 4 is for the ground connection. The RS-232D pin out is shown in the diagram below.
Figure 2-1. RS-232D Pin-out at 6CN Connector
Cable Specifications:
-cable should be a shielded, thin twisted wire 22-28 AWG
-cable pinout is as follows:
Computer - 9 Pin Female
D shell GPD 515 Connector for 6CN
3 - Tx 2 - Rx
2 - Rx 1 - Tx
5 - GND 4 - GND
-pinout for devices other than a computer (PC), such as a PLC, may vary.
GPD515
6CN
Connector
GND
1
2
3
4
Rx
Tx
1CN
Connector
2CN
Connector
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