Rockwell Automation 2711P Creating Modbus Applications - Manual (Page 11)

11 Publication 2711P-UM002B-EN-P - March 2007
Chapter
2
Modbus KEPServer Drivers
Objectives This chapter provides an overview of MODBUS KEPServer drivers
available in the RSView Enterprise software.
• Modbus Master/Slave
– Modbus (RTU) Serial
– Modbus Unsolicited Serial
• Modbus ASCII
• Modbus/TCP
Modbus Master/Slave A Modbus master/slave network provides a protocol for data transfer
and programming with a single RTU master and up to 247 slave
devices. A Modbus network links distributed devices with a central
computer terminal or controller for supervisory control and data
acquisition. Up to 247 nodes can be connected at data rates of up to
19,200 baud using media such as twisted pair cable, common carrier
phone lines, or microwave transmission. This network is commonly
used in SCADA application over large areas such as the water/waste
water and oil & gas industries.
Modbus (RTU) Serial
Modbus (RTU) Serial is the protocol for a master and includes RTS
support for radio modems. Supported devices include:
• Modbus compatible devices
• Elliott Flow Computer
• Magnetek GPD 515 Drive
• Omni Flow Computer
• Daniel S500 Flow Computer
• Dynamic Fluid Meter (DFM) SFC3
• Instromet
Modbus Unsolicited Serial
Modbus Unsolicited Serial simulates up to 247 Modbus slave devices.
Supported devices include Modbus compatible devices.