Transmit-Data Flow Control - 3Com 56K Command Reference Manual

Transmit-Data Flow
Control
This type of flow control is for data transmitted to the Business Modem
by its attached computer.
For your modem to
Disable transmit data flow control
Enable Hardware flow control.
Requires that your computer and software support
Clear to Send (CTS) at the EIA-232 interface.
Enable Software flow control.
Requires that your software support XON/XOFF
signaling.
Use both hardware and software flow control.
If you are unsure about what your equipment supports,
select this option.

Transmit-Data Flow Control

Command
AT&H0
AT&H1
AT&H2
AT&H3
11-5