User's Manual

HAYES AT COMPATIBLE COMMAND SET

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234839, Revision 2.2

ATS12 Escape Sequence Guard Time

Range: 0-10000 ms Default: 990 ms

The Escape Sequence Guard Time is the time delay required immediately before and after entering an

escape sequence.

For your modem to distinguish the escape sequence from ordinary data, there must be a period of

silence both before and after the escape sequence is entered. If the Escape Sequence Guard Time is

one second and the escape sequence character has been defined as ‘+’, for the modem to

recognise an escape sequence you must maintain silence on the line for one second, then type

‘+++’ in rapid succession, and then maintain another second’s silence.

The guard time is in units of milliseconds (or 1/1000 of a second).

‘S’ register 12 is also used to time the period between the escape sequence characters

as they are typed. If the period between the first and second escape characters or

second and third escape characters being entered is greater than the value in S Register

12, the modem will not recognise the escape sequence.

Examples

ATS12=990 Maintain silence on the line for 0.99 seconds before and after entering

the escape sequence