Introduction to MODBUS
The CTM-ONE can support 4 types of MODBUS:
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The mode setting of the serial port must be set to MODBUS for the RS-232/RS-485 RS232/RS485 port setting for MODBUS configuration to work even if no physical RS-232 or RS-485 RS232 or RS485 devices are physically connected to the CTM-ONE. |
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MODBUS Configuration configuration is available on the CTM-ONE local web interface under serial <modbus < modbus tab.
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The RS-232 and RS-485 RS232 and RS485 tabs expand for specific MODBUS functionality. The CTM-ONE supports simultaneous RS-232 and RS-485 RS232 and RS485 protocols so individual configurations can exist for either protocol.
For Ethernet-based MODBUS communication (TCP / RTU over UDP), either MODBUS RS-232 or RS-485 can be usedRS232 or RS485 can be used.
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The “Mode” defines the Gateway Master or Gateway Slave operating state.
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Access must also be enabled for routing data via the wireless network when using MODBUS.