US Robotics 56K USB Modem User Manual page 31

Table 28. &G<value> Commands
Command
&G0 Disables guard tone (default).
&G1 Selects 550 Hz guard tone.
&G2 Selects 1800 Hz guard tone.
&J<value>—Auxiliary Relay Option
This command is supported to ensure backward compatibility with communications software that issues
the J0 command. The J1 version of this command is not supported. The auxiliary relay is never closed.
Result codes:
• OK if <value> = 0.
ERROR if <value> ≠ 0.
•
Table 29. &J<value> Commands
Command
&J0 The auxiliary relay is never closed (default).
&K<value>—Local Flow Control Selection
Use this command to select a flow control method.
Result codes:
• OK if <value> = 0, 3, or 4.
ERROR if <value> ≠ 0, 3, or 4.
•
Table 30. &K<value> Commands
Command
&K0 Disables flow control.
&K3 Enables RTS/CTS (hardware) flow control (default).
&K4 Enables XON/XOFF software flow control.
&M<value>—Asynchronous Communications Mode
This command is supported to ensure backward compatibility with communication software that issues the
&M0 command. The preferred method for changing the asynchronous communication mode is to use the
\N<error control mode> command.
Result codes:
• OK if <value> = 0.
ERROR if <value> ≠ 0.
•
Table 31. &M<value> Commands
Command
&M0
Function
Function
Function
Function
Asynchronous mode (default).
56K USB Modem
User Guide
Command Reference - 25