YSI 6 series User Manual page 223

EcoWatch for Windows
If a modem is selected for a particular COM port, then every time that port is
opened, EcoWatch will attempt to initialize a modem on that port. If the attempt
fails, then EcoWatch will open a terminal window and you can communicate to that
port with the computer keyboard. This can be very helpful in troubleshooting a
connection to your modem or in determining exactly which settings work with your
modem.

YSI Incorporated
Modem
To setup a particular modem on your first try, select that modem from the
Modem list. The only settings that you can edit are for the Custom modem.
If your modem does not work, select "Hayes Compatible" modem. Those
settings are quite common and might work for your modem. If neither approach
works, then you will have to define your own settings. You will need the
instruction manual for your modem. It should list all of the proper settings.
Choose Custom from the Modem list and enter the settings for your modem.
The Auto Answer setting is included in the dialog for completeness. EcoWatch
currently does not use Auto Answer.
Copy to Custom

The Copy to Custom button is sometimes helpful in defining your own
settings. If there is a similar modem, choose it from the list, and then
click Copy to Custom. Choose Custom from the list and edit the
settings. It transfers all modem settings from the currently selected
modem to the "Custom" modem so you can modify the setting later.
Environmental Monitoring Systems Manual
Section 4
4-27