Changes

==Introduction==

==Summary==

'''Modbus''' is a serial communications protocol originally published by Modicon (now Schneider Electric) in 1979 for use with its programmable logic controllers (PLCs). Modbus has become a de facto standard communication protocol and is now a commonly available means of connecting industrial electronic devices. The main reasons for the use of Modbus in the industrial environment are:

'''Modbus''' is a serial communications protocol originally published by Modicon (now Schneider Electric) in 1979 for use with its programmable logic controllers (PLCs). Modbus has become a de facto standard communication protocol and is now a commonly available means of connecting industrial electronic devices. The main reasons for the use of Modbus in the industrial environment are:

Modbus enables communication among many devices connected to the same network, for example, a system that measures temperature and humidity and communicates the results to a computer. Modbus is often used to connect a supervisory computer with a remote terminal unit (RTU) in supervisory control and data acquisition (SCADA) systems. Many of the data types are named from its use in driving relays: a single-bit physical output is called a coil, and a single-bit physical input is called a discrete input or a contact.

Modbus enables communication among many devices connected to the same network, for example, a system that measures temperature and humidity and communicates the results to a computer. Modbus is often used to connect a supervisory computer with a remote terminal unit (RTU) in supervisory control and data acquisition (SCADA) systems. Many of the data types are named from its use in driving relays: a single-bit physical output is called a coil, and a single-bit physical input is called a discrete input or a contact.

This article provides an example on how to use Modbus serial to monitor a slave device, send data to server and how to configure slave alarms.

This article provides a brief example on how to use Modbus serial to monitor a slave device, send data to server and how to configure slave alarms. To find more information about this feature visit [[RUT955 Modbus]] and [[RUT955 RS232/RS485]] pages.

==Prerequisites==

==Prerequisites==

==Topology==

==Topology==

[[File:Networking_rut955_configuration_modbus_serial_topology_2_v1.png|border|class=tlt-border|800x1000px]]

[[File:Networking_rut955_configuration_modbus_serial_topology_2_v1.png|border|class=tlt-border|700x700px]]

==Configuring Modbus serial slave device==

==Configuring Modbus serial slave device==

Change the value to anything below 5, you should not receive messages. Then change the value to anything above 5, you should start receiving messages.

Change the value to anything below 5, you should not receive messages. Then change the value to anything above 5, you should start receiving messages.