Modbus Class

The Modbus Class in GPL supports master access to MODBUS/TCP slave devices connected to the local Ethernet.

Table 19-48 summarizes the methods and properties of the class.

Table 19-48: Modbus Class Definitions
Modbus Class Member	Type	Description
New Modbus	Constructor Method	Creates an object for a MODBUS connection and specifies the IP address.
modbus_object.Close	Method	Closes any connections associated with this object.
modbus_object.ReadCoils	Method	Reads one or more outputs.
modbus_object.ReadDeviceId	Method	Reads the device ID strings.
modbus_object.ReadDiscreteInputs	Method	Reads one or more inputs.
modbus_object.ReadHoldingRegisters	Method	Reads one or more holding registers.
modbus_object.ReadInputRegisters	Method	Reads one or more input registers.
modbus_object.Timeout	Get/Set Property	Gets or sets the timeout, in milliseconds, that this connection will wait for a reply before throwing an exception.
modbus_object.WriteMultipleCoils	Method	Writes multiple outputs.
modbus_object.WriteMultipleRegisters	Method	Writes multiple holding registers.
modbus_object.WriteSingleCoil	Method	Writes a single output.
modbus_object.WriteSingleRegister	Method	Writes a single holding register.