Device Configuration Modbus Tab
The Modbus Tab allows you to configure the basic settings for the SCADAPack x70 device when it is used as either a Modbus Server or a Modbus Slave.
Modbus / TCP Server
Use the Unit Identifier field within the Modbus/TCP Server section of the Modbus tab to specify the Unit Identifier of the SCADAPack x70 Device. You can enter value of 1 to 247. The default is 1.
For a SCADAPack x70 Device to operate as a Modbus/TCP server, you have to select the Modbus/TCP (Server) service within Configure the Device Options section of the Settings tab, otherwise the setting of this field is ignored.
Modbus Slave, TCP Server
The Modbus Slave, TCP Server section only applies if the SCADAPack x70 Device is a Modbus Slave. To communicate as a Modbus Slave device, at least one of the SCADAPack x70 Device's ports has to have its Function defined as Modbus (see Port Function - Modbus).
Use this combo box to specify the type of Modbus register addressing that the SCADAPack x70 Device uses. Select from:
The Modbus/TCP Server or Modbus RTU Slave uses 5-digit addressing.
In 5-digit Modbus addressing, the leading digit generally represents the register data type. For example, if a SCADAPack x70 device reads Modbus register 40010, it is represented by Modbus protocol function code 3 and protocol register address 0x0009.
The Modbus/TCP Server or Modbus RTU Slave uses 6-digit addressing.
In 6-digit Modbus addressing, the address is composed of a single-digit numeric prefix and a 5-digit Modbus register number to enable access to additional registers in each register range.