Caché ObjectScript Reference - InterSystems Documentation

System and Other FunctionsError on disconnect is only applicable to TCP devices and to terminal devices where a disconnectcan be recognized. Examples are modem controlled terminals and Windows Telnet,Windows LAT, and Windows local cterm (TRM:) connections. Error on disconnect is onlyapplicable to the principal device.You can also test the $ZA special variable to check for terminal disconnection. When bit 11of $ZA for the principal device is set, the principal device has disconnected.This function overrides the system-wide I/O device disconnect detection default. To set thesystem-wide default behavior, go to the System Management Portal, select Configuration,then select Advanced Settings. On the pull-down Category list select Terminal. View andedit the current setting of ErrorOnDisconnect. When 1 (true), Caché issues a errorif a disconnect occurs. If 0 (false), no error is issued. The default is 0. To override this defaultsystem-wide, you can use $ZUTIL(69,15) — I/O Device Disconnect Detection SystemDefault.Invoking $ZUTIL(68,15) without specifying n returns the current switch setting.ParametersnThe value that specifies whether Caché detects I/O device disconnection.01Disables disconnection detection (the default).Enables disconnection detection.See Also• $ZUTIL(69,15) I/O Device Disconnect Detection System Default function• $ZA special variable• Terminal I/O in Caché I/O Device Guide608 Caché ObjectScript Reference