A Modbus Server String Record allows writing Modbus file records (server side support for Modbus function codes 20 and 21). The input and output is a string converted to/from a byte array. Writing occurs when the linkable “write” action is fired.
Use of function codes 20 and 21 in Modbus devices is not typical, and so this object is expected to be infrequently used.
Configuration properties specify:
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File Number — From 0 to 65535.
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Starting Record Number — From 0 to 9999.
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Record Length — From 0 to 65535.
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Write On Input Change — Either false (default) or true.
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Padding — Either Pad with spaces (default) or Pad with nulls.
This component allows you to locally set the value of a string file record, and also accepts read and write messages for the specified file record. It also converts the data to ASCII characters to display as a string.
To use, copy from the modbusSlave or modbusTcpSlave palette and place anywhere under the Modbus server device (note it is not a proxy point—if you put under the device’s Points container it will not be visible in any Modbus Server Point Manager view).