This module detects the Modbus service, tested on a SAIA PCD1.M2 system. Modbus is a clear text protocol used in common SCADA systems, developed originally as a serial-line (RS232) async protocol, and later transformed to IP, which is called ModbusTCP.
To display the available options, load the module within the Metasploit console and run the commands 'show options' or 'show advanced':
msf > use auxiliary/scanner/scada/modbusdetect
msf auxiliary(modbusdetect) > show actions
...actions...
msf auxiliary(modbusdetect) > set ACTION < action-name >
msf auxiliary(modbusdetect) > show options
...show and set options...
msf auxiliary(modbusdetect) > run
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