V-Tech DT-IP Technical Guide - Manual (Page 50)

If you want to check if the devices are online, you can press Refresh Online button or click
right mouse button on Benchmark Project then select Check Network Device Online. See
the following picture, Means device offline, and means PC is online, but IP-Agent isn’t
opened. indicates the model of IP Node is wrong selected, or wrong DIP switch setting of
IPC.
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IP-2 wire system technical guide