Fn Sets online local echo of transmitted data ON/OFF.

F0 Local echo ON. Modem sends a copy of data it sends to the remote system to your screen.

F1 Local echo OFF.

Receiving system may send a remote echo of data it receives.

Hn Controls ON/OFF hook.

H0 Hangs up (goes on hook)

H1 Goes off hook.

In Displays the following information.

I0 Four-digit product code.

I1 Results of ROM checksum.

I2 Results of RAM checksum.

I3 Product type.

I4 Current modem settings.

I5 Nonvolatile memory (NVRAM) settings.

I6 Link diagnostics.

I7 Product configuration.

I8 Returns the blacklisted phone numbers.

Ln Controls speaker volume (internals only).

L0 Low.

L1 Low.

L2 Medium.

L3 High.

Mn Operates speaker.

M0 Speaker always OFF.

M1 Speaker ON until CONNECT.

M2 Speaker always ON.

M3 Speaker ON after dial, until CONNECT.

On Returns online.

O0 Returns online.

O1 Returns online and retrains.

PSets pulse dial (for phone lines that don’t support touchtone dialing).

Qn Displays/suppresses result codes.

Q0 Displays result codes.

Q1 Quiet mode; no result codes.

Q2 Displays result codes only in Originate mode

Sr.b=n Sets bit .b of register r to n (0/OFF or 1/ON).

40 Sportster Winmodem 33600 & x2/56K - User's manual

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USRobotics x2/56K Fn Sets online local echo of transmitted data ON/OFF, Hn Controls ON/OFF hook, Mn Operates speaker