Why does my IDA 4 Plus fail to communicate with my computer?
The RS232 ports (Serial Port) on your computer and IDA 4 Plus must be configured the same way. Hydrograph for Windows assumes the IDA 4 Plus RS232 port to be set to its default: 19,200 baud.
Verify that your IDA 4 Plus RS232 port is set to 19,200 baud. RS232 settings be viewed in the Utilities menu.
If using Hydrograph for Windows, verify that Hydrograph has configured your RS232 port to 19,200 baud. In Hydrograph, RS232 port settings can be viewed and changed, by clicking "Control" on the menu bar, then by selecting the "Com Port Settings" option.