## Input/Output Device Driver Reference

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### Output Handshaking Using CTS, DSR, DCD

This mode of the physical device driver can be controlled independently for each modem control signal. When this mode is enabled, the physical device driver does not give data to the transmit hardware if the modem control signals are OFF (disabled). Data is not transmitted unless all the lines enabled for output handshaking are up.

If one of these modes is enabled, Error Alerts might be generated when the OS/2 Logging Facility is enabled. If an external device causes CTS, DCD, or DSR to become inactive, transmission is blocked while the device driver waits for the respective line to become active again. If the line does not become active before the Write Timeout period expires, an Error Alert is generated.

Initial Value Output handshaking using CTS and DSR is enabled. Output handshaking using DCD is disabled.

First Level Open No effect.

Mode Utility User interface to enable/disable this mode of the physical device driver for CTS and DSR (independently). Mode always disables this mode of operation of the physical device driver for DCD.

Automatic Override When Output Handshaking using DSR, CTS, or DCD is enabled, the physical device driver responds to the dropping modem line within a single character time. That is, Automatic Protocol Override controls the Extended Hardware Buffering capability so that only one character at a time is given to the transmit hardware (Transmit Buffer Load Count is set to 1). The Receive Trigger Level is unaffected.