DTR Mode (DT) setting

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Description (see setting description format info here)

 

Function:Defines the function of the DTR line of the serial port of the DS

 

Set (S) command format:SDTx, where x: 0 (idle), 1 (connection status)

 

Get (G) command format:GDT

 

Init (I) command effect:Initialized unconditionally, through network command, serial command, or quick initialization

 

Post-initialization value:0 (idle)

 

Change takes effect:After reboot

 

Overriding parameter:---

 

Relevance conditions:---

 

First introduced:Earlier than "baseline" V3.14/V3.51

 

See also:Ethernet port and network communications,  Serial port and serial communications

 

Details

 

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, DS202R, EM100-EV, EM120/EM200-EV, EM202-EV. For EM100, EM120, EM200, EM202, EM1000 the signaling is exactly opposite.