Determines whether the carrier is present by querying the state of the Carrier Detect (CD) line. Carrier Detect is a signal sent from a modem to the attached computer to indicate that the modem is online. This property is not available at design time and is read-only at run time.
Syntax
object.CDHolding
The CDHolding property syntax has these parts:
| Part | Description |
| object | An object expression that evaluates to an object in the Applies To list. |
Settings
The settings for the CDHolding property are:
| Setting | Description |
| True | Carrier Detect line is high |
| False | Carrier Detect line is low |
Remarks
Note It is especially important to trap a loss of the carrier in a host application, such as a bulletin board, because the caller can hang up (drop the carrier) at any time.
The Carrier Detect is also known as the Receive Line Signal Detect (RLSD).
Data Type
Boolean