Modbus to TCP/IP
Figure 1 depicts several ways in which WinTECH Software utilities may be used
to integrate modbus equipment with a PC network.
- Shows a direct serial connection between the PC and the modbus, (ModScan32, ModSim32).
- Shows a network connection from the PC directly to an interface card
installed in the modbus devices, (ModScan32).
- Shows a network connection from PC to PC. In this case the second PC
acts as a bridge device between the connected modbus slave and the network, (MNetSvr).
- Shows a modem connection between the PC and a modbus device, (ModScan32).
- Functionally equivalent to connection #3, this depicts the built-in
dial-up networking support available with Win32 systems, (ModScan32).
- Shows a PC "Listening" to an active modbus session, distributing
data across the network, (MNetMon).
MODBUS to TCP/IP Server
is a Windows application which serves as a bridge between a
serial modbus network and the TCP/IP protocol. MNetSvr operates according
to the modbus/TCP standard, interfacing multiple network client applications
with one or more serial modbus devices. Using MNetSvr to control serial
data interaction with the modbus allows any modbus/TCP compatible client application
running on the LAN to access and/or modify data points in the slave. Each network
client operates as though it is connected directly to the device, greatly simplifying
the task of acquiring data.
MODBUS Monitor to TCP/IP Server
Whereas MNetSvr requires that the slave network be connected directly to the
PC operating as the server, MNetMon
is a Windows application designed to monitor
an active modbus communications link, duplicating data from the slave device
and making it available to other network clients. MNetMon operates transparently,
listening to both sides of an RS-232 serial conversation without interfering
with the existing devices. As the modbus slave transmits a response
to master queries, MNetMon captures the data and maintains its own
local database for operation as an modbus/TCP network server.
Last Updated: June 7, 2001
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