CDHolding Retrieves the state of the Carier Detect (CD or DCD) liine. Read Only at runtime. MSComm32 and SComm32 have the same syntax and functionality   Syntax:- value = SComm32.CDHolding   value:- A Boolean Expression indicating the current state of the CD/DCD line.   Example:- If SComm1.CDHolding = True Then    MsgBox ("DCD is On") Else    MsgBox ("DCD is Off") End If

Remarks: The DCD line is a 'Modem Control' line. Not usually used when connecting two computers or other 'Terminal' equipment. When using a Modem - your modem dials a number and negotiates a connection to a remote modem and this property will become true once the connection is established. Once this property becomes True it means that the modems have finished negotiating and you have a through connection to the remote computer and any data you send will be sent, via the modems, to the remote terminal. If this property unexpectedly goes False during a modem connection then it means that your connection was lost.