User manual

TECHNICAL REFERENCE

S Registers

Note: To change a setting use ATSr=n, where r is the register and n is a decimal value from 0 − 255 (unless otherwise indicated).

8-17

S27 0 Bit-mapped register setup. To set the register, see instructions for S13.

Bit Value Result

0 1 Enables ITU-T V.21 modulation at 300 bps for overseas calls; in V.21 mode, the modem

answers both overseas and domestic (U.S. and Canada) calls, but only originates V.21 calls

(default Bell 103).

1 2 Enables unencoded (non-trellis coded) modulation in V.32 mode.

2 4 Disables V.32 modulation.

3 8 Disables 2100 Hz answer tone to allow two V.42 modems to connect faster.

4 16 Enables V.23 fallback mode.

5 32 Disables V.32bis mode.

6 64 Disable V.42 selective reject.

7 128 Software compatibility mode. This setting disables the codes and displays the 9600 code instead.

The actual rate of the call can be viewed on the ATI6 screen. Used for unusual software

incompatibilities. Some software may not accept 7200, 12,000, and 14,400 bps or greater result

codes.

S28 0 Eliminates the V.32 answer tones for a faster connection.

8 Default item, all times are in tenths of seconds.

255 Disables all connections except V.32 at 9600 bps.

S29 20 Sets the duration, in tenths of a second, of the V.21 answer mode fallback timer.

S30 0 Reserved

S31 128 Reserved