DTR Idle

When selected (the default), the Data Terminal Ready (DTR) drop time for the port is 500ms.

When deselected, the port can provide a better connection to systems or hosts that have serial ports and allow bidirectional communications but do not support TCP/IP---for example, a host that provides a bulletin board service (BBS). For this type of connection, you must connect the PortMaster port to the host, usually with a null modem cable.