GPD315 Modbus RTU Technical Manual TM 4325
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Chapter 1
GPD315/V7 and Serial Communication
Introduction
This manual describes the set-up and protocol for Modbus Communication. The GPD315/V7
offers RS-485 and RS-422 serial communication as a standard.
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
(slaves) respond by supplying the requested data to the master, or by taking the action
requested. The drive must act in the slave mode.
A complete understanding of the drive programming and operation is required before attempting
serial communication operation. A full discussion of programming and operation is covered in the
GPD315/V7 technical manual, TM4315.
GPD315 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.
Table 1-1 Serial Setup
Parameter Description Type Range
n154 Baud Rate Selectable 2400, 4800, 9600, or 19200 bps
N/A Data Bit Fixed 8
n155 Parity Selectable none, even, or odd
N/A Stop Bit Fixed 1
n153 Node/Slave Address Selectable maximum of 31 nodes
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