Telephone Interface
A telephone connected to the T-311 can be used two ways: (1) as an auxiliary telephone sharing the
line with the T-311 (outgoing calls are dialed from the telephone set directly over the telephone and do
not go through the T-311 circuitry), or (2) operating through the T-311 (outgoing calls are dialed from
the computer). The second mode is identical to operation with a headset.
Standard Commands
The industry-standard AT command set is used where applicable.
Selectable Baud Rates
You can select a baud rate from 300 to 9600 bps to set the speed with which ASCII data is transferred
between the computer and T-311. It does not refer to the rate of data transmittal across the telephone
lines. See Chapter 10, “RS-232-C Communications Link” on page 43 for details.
Outgoing Call Features
Autodialing
The T-311 can autodial a series of programmed numbers. It can also permanently store a number
string for repeated dialing with the command “ATDS”. (See page 26 for more detail.)
Tone and Pulse Dialing
To ensure the widest possible range of applications, the T-311 works with both DTMF and rotary sig-
naling.
Dial Tone Detection
The T-311 can detect both primary and secondary dial tones. In the autodialing mode, the T-311 can
be programmed to delay dialing until it detects secondary dial tone.
Call Progress
By detecting and analyzing standard call progress tones (e.g., reorder, busy, and audible ringing
/“ringback”), the T-311 is able to return information to the computer about the status of originated
calls. By detecting Special Information Tones (S.I.T.), the T-311 recognizes incomplete calls to speed
placement of the next call.
Call Answering Features
Auto and Forced Answer
Auto answer allows unsupervised operation of the T-311; forced answer commands the T-311 to an-
swer the call. By disabling answer altogether, the T-311 owner can ensure that the telephone line is
used for making outgoing calls only.
Security Checking on Incoming Calls
When security is enabled, the T-311 automatically disconnects callers who fail to enter the correct
password in the allotted time.
LED Indicators
The T-311 includes five LEDs. Operation of the LEDs is described in Table 1.
T-311
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