Z02215
Single Chip Modem with Integrated Controller, Data Pump, and AFE
35
Table 4. Dial Modifiers (Continued)
Modifier
Function
@
Wait for quiet answer. The @ modifier causes the modem to listen for silence before
continuing. The modem waits up to the length of specified time in S-register S7. If
enough (configurable by country) silence is not detected within the time period specified
in S-register S7, the modem hangs up and returns the NO ANSWER result code. If
enough silence is detected, the modem continues processing the other characters in the
dial string.
!
;
Timed break recall (Hookflash). An exclamation point (!) causes the modem to hang
up the telephone line for the length of time specified in S-register S29, then take the
telephone line off-hook again. This modifier is frequently used to access a PBX’s call
transfer function.
Return to COMMAND state after dialing. A semicolon (;) instructs the modem to return
to COMMAND state after dialing without breaking the telephone line connection and
without handshaking with the other modem. The semicolon may only be used when
calling a voice mail system that permits tones to transmit numbers when a connection is
established.
Setting the Highest Line Rate
The connect rate can be selected by S-register S37. The following connect rates
are supported.
Table 5. S37 Register Connect Rates
S37 Value
Carrier
Data Rate
0
1
The Data Rate of the Last AT Command
V.23
1200/75 bps. Refer to the Communication Standard Options (B)
command for a description.
When ON-LINE, the modem recognizes the Escape Sequence (+++)
and modem commands only at 1200 bps.
2
Bell 202, Bell 202T 1200/150 bps. Refer to the Communication Standard Options (B)
command for a description.
When ON-LINE, the modem recognizes the Escape Sequence (+++)
and modem commands only at 1200 bps.
3
V.21, Bell 103
300 bps. Refer to the Communication Standard Options (B)
command for a description.
4
5
Reserved
V.22, Bell 212A
V.22bis
1200 bps. Refer to the Communication Standard Options (B)
command for a description.
6
2400 bps
PS001907-0904
Setting the Highest Line Rate
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