User Manual
Industrial Ethernet Serial Gateway
Modbus Serial/TCP Series
WWW.SSTCOMM.COM
22
3.3.6 Priority control (Advanced parameters)
When users select RTU slave or ASCII slave mode, and only configure the basic configuration, this does not
need to be configured. (Modbus Serial/TCP series gateway does not support this feature temporarily)
Ethernet speed is faster than serial port, and it will cause queuing of frame, then you can set priority of
frames.
After enabling “Priority Control”, users can set the parameters they want and only “RTU/ASCII salve mode”
supports the function:
Specify the master——the requests of specified master are prior to transmit.
Specify the request——the requests of specified slave ID (virtual ID) or function codes are prior to transmit.
Priority of requests:
Conditions
Priority
Comply with specified master, and comply with specified request
High
Comply with specified master, or comply with specified request
General
Not comply with priority conditions
Low
Use method of “Add”, “Modify” and “Delete” is the same with “ID mapping”.
