User`s manual

U.S. Robotics I-modem Command Reference
Appendix A: Alphabetic Command Summary • Page A-6
Fn Online local echo. If ON, an I-modem displays on your screen the data that it is
transmitting to another modem.
F0 Online echo ON. (Sometimes called half duplex.)
F1 Online echo OFF. (Sometimes called full duplex.)
Hn Go on or off hook.
H0 Go on hook (hang up).
In Query the I-modem.
I0 Display the four-digit product code.
I1 Display results of R
OM checksum test (factory test).
I2 Display results of RAM
test.
I3 Displays the banner (product name).
I4 Display current modem settings.