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Hayes protocol reference
S8
Pause (,) duration definition
To access an outside line through a PBX or when using a special telephone
service, the comma(,) is used to pause after dialing an access code. The value
of register SS determines pause duration for this comma. Defaulted to 2 se-
conds, it can be changed by inputting the desired number of seconds.
S9
Carrier detect response time definition
The value of register S9 determines the length of time (carrier duration) which
the Modem takes to recognize the carrier tone and go ON LINE. As the value
increases, the possibility of detecting a false carrier from noise decreases.
The default value of S9 is set at 6 with the unit of 1/lO second (0.6 seconds).
To change it, input the desired duration times 10.
DO NOT confuse S9 with the carrier tone wait time definition, S7.
SlO
Carrier loss time definition
Register SlO decides how long the Modem waits for carrier before discon-
necting the line. When the Modem does not receive a carrier tone within the
time fixed by the SlO value, it disconnects the telephone line.
When you set the value to 255, the Modem assumes the carrier is always
present and ignores carrier detect. It is defaulted to 7 (0.7 seconds). To change,
fo.put the desired number of seconds times 10.
·
Sll
Touch-tone dialing speed definition
The value of Sl 1 defines the duration and spacing of the tones during touch-
tone dialing. The default value of Sl 1 is 70 in units of milliseconds. This
sets the dialing rate to 7.14 digits per second. The dialing rate of
5
(10) digits
per second can be obtained by applying the value 100 (50) to Sl 1. The mini-
mum value for reliable dialing is 50 and the maximum value is 255.
Register Sll does not affect the pulse dialing speed; it is fixed at 10 pps.
S12
Escape code guard time definition
The value of S12 determines the escape code guard time. This escape guard
time is specified to 20 minimum and 255 maximum in units of 1/50 second.
The default value is 50, that is, 1 second.
Note: Beware that the small guard time you assign should be
greater than the time required to transmit one of the 3 es-
cape characters. .
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