The CTM-ONE is a remote wireless gateway physically connected to another MODBUS Slave Device. The Slave Gateway can communicate with local devices via Ethernet, RS232, RS485, or GPIO Input/Output (Self Slave). Typically, the Slave Gateway communicates via a single protocol, such as RS232, although simultaneous communication via RS232 and Ethernet is also possible.
Setting Name | Descriptions | Value |
Mode | Configure device to act as a Slave Gateway | MODBUS Gateway Slave |
WAN Encapsulation | Protocol used to communicate with remote Master Gateway | TCP or RTU over UDP - Should match Master Gateway |
Navigate to network → access → MODBUS RS-232 Access or MODBUS RS-485 Access | Enable WWAN access to serial data for Master | Enable and port number |
Remote MODBUS Gateway Slaves
| Slave Gateway requires a list of all the slaves connected to it and their pre-determined addresses. |
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Example of configuring a MODBUS TCP Slave with the CTM-ONE serving as the Master Slave Gateway:
Choose a Serial mode, either RS232 or RS485, and configure it as "MODBUS".
Baud Rate settings are unnecessary unless there is a slave device utilizing RS-232 or RS-485.
Configure the Serial port selected, either RS232 or RS485 to the “MODBUS Gateway Slave” mode.
Expand the “MODBUS Gateway Settings”. Make sure the WAN Encapsulation is set to TCP for MODBUS TCP (MODBUS RTU over UDP is also supported).
Expand the “MODBUS Gateway Settings” → “MODBUS Gateway Slave Settings
and define the “Local Slave Devices”.
Select Save and Apply and the MODBUS TCP slave device will communicate with the MODBUS Master.
Example of a MODBUS Gateway Slave using connected to an RS232 MODBUS Device
Example of Two MODBUS Slave devices connected to MODBUS Slave Gateway, one TCP one RS232
