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Kepware Knowledge Base: Solution

KEPServerEX: Connecting to a Device Through a Telephone Modem

Last Update: 11/7/2018

In order to connect to a device through a telephone modem, the modem must be configured to always dial and connect using the communication parameters that are defined in the PLC; otherwise, it will not be able to communicate with the device. Since most off-the-shelf modems are designed to provide internet access, they will not honor a configuration stored in Non-Volatile Random Access Memory (NVRAM). The Industrial Modems from Sixnet and the Z Modems from MultiTech work well for this setup.

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