Introduction to MODBUS
The CTM-ONE can and CTM-500 support 4 types of MODBUS:
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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 -ONEdevice. |
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MODBUS configuration is available on the CTM -ONE local web interface under serial < modbus tab.
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The RS232 and RS485 tabs expand for specific MODBUS functionality. The CTM -ONE supports simultaneous RS232 and RS485 protocols so individual configurations can exist for either protocol.
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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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