MGate MB3000 Modbus Gateway User Manual
Modbus TCP Port
Allows you to change the Modbus TCP listen port from the default value (502).
Slave Channel and Response Time-out
According to the Modbus standard, the time that it takes for a slave device to respond to a request is
defined by the device manufacturer (please refer to Appendix A for details). Based on this response time, a
master can be configured to wait a certain amount of time for a slave’s response. If no response is received
within the specified time, the master will disregard the request and continue operation. This allows the
Modbus system to continue operation even if a slave device is disconnected or faulty.
On the MGate MB3000, the Response Time-out field is used to configure how long the gateway will wait
for a response from a Modbus ASCII or RTU slave. This field is set independently for each serial port, which
is selected through the Slave Channel field. Please refer to your device manufacturer’s documentation to
manually set the response time-out.
The MGate MB3000 also provides automatic calibration of the response time-out. Instead of manually
figuring out the appropriate setting, you can click Auto Detection to have the MGate figure out the setting
for you. Once a value has been recommended, you can fine-tune it for best performance.
Inter-Character Time-Out
Use this function to determine the time-out interval between characters for Modbus devices that cannot
receive Rx signals within an expected time interval. If the response is timed out, all received data will be
discarded. Note that this time-out mechanism only works in RTU slave mode. The MGate MB3000 will
automatically determine the time-out interval if the time-out value is set to 0.
Inter-Frame Delay
In Modbus RTU slave mode, user can determine the time-delay to transmit the data frame received from
the slave device to the upstream. The MGate MB3000 will automatically determine the time interval if it is
set to 0.
Modbus Routing
The Modbus Routing tab is where the Modbus slave IDs are managed. The definitions on this tab
determine how Modbus requests will be routed to the serial ports by the gateway.
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