Westermo EDW-100 - Manual (Page 20)

20 6616-2203
Short description of Modbus
Modbus is a communication protocol developed by Modicon systems. The EDW-100
Modbus gateway is used for interconnecting a TCP/IP Modbus network and a serial line
Modbus network (either RTU or ASCII). It permits Modbus clients (masters) on either of
the TCP/IP or the serial network to connect to Servers (slaves) on the other network.
In a standard Modbus network, there is one master and up to 247 Slaves, each with a
unique slave address from 1 to 247. The master can also write information to the slaves.
The official Modbus specification can be found at
www.modbus.org .
Gateway Server mode
Allows up to 16 Modbus clients (masters) on a TCP/IP network to connect to servers
(slaves) on the serial network.
Ethernet
Modbus TCP Client
Modbus TCP Client
Modbus TCP
RS-485
Modbus RTU or
Modbus ASCII
Modbus Slave 2
Modbus Slave 1
Modbus Slave 3
Modbus Slave 4
Up to 16 TCP
Clients (Master)
EDW-100
Modbus Gateway
Up to 247 servers
(Slaves)