User`s guide

Command Set Assumptions
The SLTA-10 Adapter uses the following strings received from the modem to
interpret the connection state. These strings are consistent with all Hayes AT
compatible modems operating in the word response mode (alphabetic responses).
[CR] is the hex OD character.
CONNECT [any text] [CR]
BUSY [CR]
VOICE [CR]
NO [any text1 [CR]
ERROR [CR]
The "CONNECT" string may be, and typically is, followed by other informative text,
such as connection serial bit rate or error correction methods in use.
These other four states indicate a failure to make the connection.
Translated Characters
All strings that are sent specifically to the modem (as commands) by the SLTA-10
Adapter are scanned for certain characters by the SLTA-10 firmware. These
characters are then translated into specific functions or characters unless they are
preceded by a backslash (“\“>. The characters are:
The tilde will cause the SLTA-10 Adapter to pause 500ms before sending the
next character to the modem. The tilde itself is not sent.
!
The exclamation point will cause the SLTA-10 Adapter to send a carriage
return (OxOH) to the modem. The exclamation point itself is not sent.
The tilde is provided for users familiar with existing modem packages. It can be
used, for example, in the command string which causes the modem to hang-up. When
dialing out, Hayes AT-compatible modems use the comma character to insert delays
between portions of a dial command; the comma character should continue to be used
for dialing out.
DTE Connections
In addition to the basic three wire connections-Transmit Data (TXD), Receive Data
(RXD), and Signal Ground- there are two additional signals that must be connected:
Data Carrier Detect (DCD) and Data Terminal Ready (DTR). The modem must also
be configured to use these signals. DCD is used by the SLTA-10 Adapter to
determine that a connection has been made and DTR is used to terminate a
connection by hanging up. Note that many modems default to ignore these two
signals and must be configured to enable them. The following AT command enables
these two signals on many modems.
AT&Cl&D2[CR]
11-4
Using the SLTA-10 Adapter with a Modem