Black Box 3600 MODEM manual Online Character Echo F, Hanging Up H, H1, Fast Disconnect H2, H3

AT Commands

If the screen shows no characters, enter the E1 command to turn modem echo on or enable local echo on the terminal.

Command	Operation
E	Echo off
E1	Echo on

Online Character Echo F

In some lower speed modems the F command determines if characters are echoed to the DTE from the modem when online. This function is generally controlled by the communications software. The modem does not support online character echo.

Hanging Up H, H1

To end a call, enter the H command. This tells the modem to disconnect and go on hook. The modem must be in command mode to use this command.

Enter the H1 command to take the modem off hook. The modem automatically goes off hook when a dial command is keyed in.

Fast Disconnect H2, H3

The results of the H command can be modified by the H2 and H3 commands. H2 or H3 will not cause a hang up but will affect the method of hanging up the next time the H command is issued. If H2 is entered, the H command will hang up according to CCITTV.32 standards. If operating in V.32 bis mode the H2 command could take several seconds. If H3 (the fast command) is entered, the H command will hang up much more rapidly at those speeds.

Command	Operation
H	The modem hangs up.
H1	Forces modem off hook
H2	Sets H command to normal hangup procedure (long
	space, cleardown, protocol)
H3	Sets H command to fast hang up

Modem 3600 5-23