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S-Registers

Table 26. S-Register Command Descriptions (Continued)

Command

Default

 

 

Description

 

 

 

 

 

Guard Time: S12 is used to specify guard and detect times used for the Hayes and TIES

 

 

escape sequences.

 

 

 

For the Hayes Escape Sequence, S12 specifies the minimum-delay timer (or guard time) before

 

 

and after the three escape characters that is required for the modem to detect the Hayes

S12

50

Escape Sequence.

 

For TIES, S12 specifies the maximum time limit that must elapse after receiving the three

 

 

 

 

escape characters (and no other characters) before sending an OK message to the DTE.

 

 

Range:

0–255 (1/50 of a second)

 

 

Default:

50 (equals 1 second)

 

 

 

 

 

Bit-Mapped Options: S14 is a read-only register that indicates AT command settings.

 

 

Bit 0

 

Reserved

 

 

Bit 1

0

E0 is selected

 

 

 

1*

E1 is selected

 

 

Bit 2

0*

Q0 is selected

 

 

 

1

Q1 is selected

S14

138

Bit 3

0

V0 is selected

 

1*

V1 is selected

 

 

 

 

 

Bit 4

 

Reserved

 

 

Bit 5

0*

T (tone) dial is selected

 

 

 

1

P (pulse) dial is selected

 

 

Bit 6

 

Reserved

 

 

Bit 7

0

Answer

 

 

 

1*

Originate

 

 

 

 

 

Modem Test Options: S16 indicates the test in progress.

 

 

Bit 0

0*

Local analog loopback disabled

 

 

 

1

Local analog loopback enabled (&T1)

 

 

Bit 1

 

Reserved

S16

0

Bit 2–5

 

Reserved

 

 

Bit 6

0*

Analog loopback with self-test disabled

 

 

 

1

Analog loopback with self-test enabled (&T8)

 

 

Bit 7

0*

Reserved

 

 

 

1

Reserved

 

 

 

 

 

Modem Test Timer: S18 specifies the length of time that the modem conducts a data mode

 

 

(except for V.90 and V.92) loopback test using the &Tn command. After timing out, the modem

S18

0

returns to command mode. Setting S18 to ‘0’ disables the modem test timer; the loopback test

must be terminated by issuing the appropriate escape sequence followed by an AT&T0 or ATH.

 

 

 

 

Range:

0–255 seconds

 

 

Default: 0 seconds

 

 

 

 

NOTE: An asterisk (*) denotes the factory-default setting.

 

 

 

 

 

536EX Chipset Developer’s Manual

87

Intel Confidential

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