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ASCII (usable on RS-232 and RS-485)
TCP (usable on Cell only)
RTU is the most basic Modbus protocol and is commonly used for directly wired systems. It requires a
robust connection as it has stringent timing requirements.
The ASCII protocol is most forgiving of timing issues and will produce the best communication results
when communicating over a modem. However, the ASCII protocol also uses the most bandwidth.
The TCP protocol is traditionally used over Ethernet. It takes advantage of the error checking and
correction built into TCP/IP.
Please see the
for more details on the protocols.
Modbus Server Device ID
When the station is setup as a Modbus server, this setting is used to uniquely identify the station among
the different devices that are on the same bus.
The Device ID is only relevant for RTU and ASCII protocols. It is used to allow multiple Modbus servers to
be connected to one Modbus client.
The Device ID is the address that is used by the Modbus client to select which device to communicate
with. Each server on the bus must have a unique device ID ranging from 1
–
247. Address ‘0’ is reserved
as the broadcast address.
When a Modbus client issues a command, it includes the Device ID in the command. Only the Modbus
server with a matching ID is allowed to answer. If multiple servers have the same ID, communication will
not work.
Device ID is sometimes referred to as Server Address, Station Address, or Server ID.
Modbus Baud Rate
Default is 19200 Baud. Care must be taken to make sure the selected speed matches that of the client or
there will be communication problems.
This setting affects both Modbus client and Modbus server.
Modbus Parity
Default is Even. Available choices include Even, Odd and None.
Note: Care must be taken to make sure the selected parity matches that of the client or there will be
communication problems.
This setting affects both Modbus client and Modbus server.
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