DTR Mode (DT) setting
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Description (see setting description format info here)
When the DTR Mode is 0 (idle) the DTR line is at HIGH* unless changed by the remote host. Remote host can control the DTR line through Set I/O Pin Status (Sx) instructions or Notification (J) messages.
When the DTR Mode is 1 (connection status) the DTR (output) line of the DS reflects current connection status: the DTR line is LOW* when no data connection is established at the moment and HIGH* when there is a data connection in progress.
Remote host can get current status of the DTR line at any time using the Get I/O Pin Status (Gx) instruction, regardless of whether the DTR Mode is 0 (idle) or 1 (connection status). Status change monitoring for the DTR line can also be enabled and Notification (J) messages generated regardless of the value of the DTR Mode setting.
* HIGH and LOW states are described with respect to the serial ports of DS100R, DS100B, DS203. For EM100, EM120, EM200, EM203(A) the signaling is exactly opposite.