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Operation
Completing a Connection
Once you have issued a dial command, the Front Panel Off Hook (OH) LED should be on. If the
connection is successful, a CONNECT result code appears, indicating you are connected to the
remote end. The result codes appear on your DTE screen when you issue a command.
Usually you need to press Enter or Return on the keyboard in order to receive a prompt from the
answering equipment. If you do not do so, you may be disconnected. The CO indicator remains on
while the Dual V.34 modem is connected to the remote end. The SD indicator flashes while the
modem is sending data and the RD indicator flashes while it is receiving data from the remote end.
Note
For a list of standard and extended result codes refer to Chapter 4, AT Command Set Operation .
Call Answering
Automatic Answering
The modem automatically answers and switches to the data mode if the automatic answering
function is enabled. The modem has built-in "ring-detection" circuitry that can be enabled to
provide automatic response to incoming calls.
1. When the value stored in S-Register 0 is greater than zero, auto-answer is enabled.
2. The modem counts ring signals on the line and display a RING message for each ring it
counts.
3. Once the ring count equals or exceeds the value stored in S0, the modem goes off hook and
begins the handshaking procedure.
The default value of the S0 register is n = 1 (auto-answer enabled on the first ring). The value of n
is programmable in AT modes of operation.
Note
For more information on AT operation, refer to
Operation .
Manual Answering
Manual Call Answering may be preferred when both voice and data calls are received on the same
line. To prevent the modem from auto-answering any calls, store the value 0 in S-Register
0.
To answer from the keyboard, enter the command AT A (Enter) upon receiving ring. To answer
from the front panel, press the front panel SEL key three times (this acts as the talk/data switch).
Either action will cause the modem to go off-hook and begin the handshaking sequence.
060R122-000
Issue 15
S-Register 0 ,
SpectraComm Dual V.34 Modem
Installation and Operation
Call Control Basics
in Chapter 4, AT Command Set
3-5
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