RS485 TO ETH ( B)
single-plank bridge, then the original method is to pass the traffic flow of the expressway on the
single- plank bridge.
The register-savi ng Modbus gateway solves the above problems. It can temporarily save the
register data obtained by the query in the Modbus gateway, so that when the Modbus TCP query
comes, the Modbus gateway can immediately return the command, which truly brings out the
fast characteristics of Modbus TCP. On the other hand, the serial port server can take the
initiative to send instructions from the serial port to automatically update the contents of the
currently saved register data, and save a copy of the latest register value.
In addition, this serial server is a fully automatic configuration-free Modbus gateway, users
do not need to configure the required register address, function code, slave address, etc. The
serial server will automatically recognize and dynamically add these registers according to the
Modbus TCP commands sent from the network port.
RS485 TO ETH (B) can show good response speed when monitori ng by multiple computers.
No matter what baud rate of the serial port is, it can generally reply data to the host within 3ms.
And showed a good real-time update speed of serial port data.
The register-savi ng Modbus gateway is a real Modbus TCP to Modbus RTU . It really takes
advantage of the fast speed of Modbus TCP and the ability to query by multiple hosts at the
same time.
Note that when the serial port server is used as a TCP client, it does not have the storage
type function and will automatically switch to the non- storage type.
The characteristics of storage Modbus are listed below:
1 . The first Modbus TCP query command is non-storage type. Because you must wait for the
RTU device to return data slowly before returning the register content to the network port.
2. If a specific command is no longer inquired by the host computer on the network side
within 5 seconds, this command will be automatically deleted and no longer sent to the RTU
device from the serial port.
3. At present, it can store 10K Modbus cache. For ordinary single-register query, about 500
instructions can be stored at the same time.
4. When multiple commands are being queried at the same time, they are sent in order. The
first command sends the first command response and waits for 485 anti-collision time (refer to
the multi-host section). The second command sends... Return to the first command after the last
command has been answered.
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