YASKAWA GPD 506/P5 Technical Manual

Also see for GPD 506/P5: Troubleshooting manual

Contents

1-2 GPD 506/P5 and Serial CommunicationsIntroduction to GPD 506/P5 Modbus RTU CommunicationThis manual describes the set-up and protocol for Modbus Communication. The GPD 506 offersRS-232 C/D serial communication as standard, and RS-485 as an option.The Modbus RTU protocol requires that the controller communicates using a master-slavetechnique, in which only one device (the master) can initiate transactions. The other devices (theslaves) respond by supplying the requested data to the master, or by taking the action requested.The GPD 506 drive must act in the slave mode.A complete understanding of drive programming and operation is required before attemptingserial communication operation. A full discussion of programming and operation is covered in theGPD 506 technical manual - TM 4506.GPD 506 / Modbus RTU SpecificationsThe data that may be sent or received from the drive consists of:-Run Command-Frequency Reference-Fault Contents-Drive Status-Drive Parameter SettingsThe following table illustrates whether the serial communication specifications are fixed or userselectable. If the specification is fixed, the fixed value is shown in the last column. If thespecification is selectable, the range of allowed values is shown in the last column.Communication Specification Fixed or Selectable RangeBaud Rate Selectable 2400, 4800, or 9600 bpsData Bit Fixed 8Parity Selectable None, Even, or OddStop Bit Fixed 1Nodes RS-232 C/D point-to-point onlyNodes Selectable for RS-485 maximum of 31 nodesStandard RS-232 C/D Serial CommunicationThe GPD506 drive offers RS-232 C/D serial communications as a standard feature of the drive.RS-232 C/D has a maximum transmission distance of 50 feet. RS-232 C/D allows point-to-pointcommunications only. The specifications for wiring and pin outs for RS-232 C/D are presentedin Chapter 2.