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Introduction to MODBUS

The CTM-ONE and CTM-500 can support 4 types of MODBUS:

  • MODBUS Master Gateway

  • MODBUS Slave Gateway

    • TCP Slave

    • Serial Slave

    • Self-Slave

The mode setting of the serial port must be set to MODBUS for the RS232/RS485 port setting for MODBUS configuration to work even if no physical RS232 or RS485 devices are physically connected to the CTM device.

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MODBUS configuration is available on the CTM local web interface under serial < modbus tab.

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The RS232 and RS485 tabs expand for specific MODBUS functionality. The CTM supports simultaneous RS232 and RS485 protocols so individual configurations can exist for either protocol.

For Ethernet-based MODBUS communication (TCP / RTU over UDP), either MODBUS RS232 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. This can be found under Configuration > Firewall > Service Access Rules.

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Make sure that field “Enable this rule” is checked off.

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