GSM LT-1
SATEL
9
Figure 5. Assignment of
alphanumeric characters to
telephone keypad.
8.2 S
ENDING
SMS
MESSAGES FROM A STATIONARY TELEPHONE SET
The GSM LT-1 module user has an option to send SMS messages form a stationary
telephone set which generates DTMF signals and is connected to the terminals R-1 and T-1.
This operation is done in much the same way as sending SMS messages in the PAGER
system.
In order to send an SMS you should:
1. Lift the handset of the telephone.
2. Dial in one sequence the "PAGER station
number" and the phone number to which the
SMS is to be sent. The number should be
entered rather quickly, without any time intervals
between consecutive digits (indicate the country
code depending on how function 114 is
programmed).
3. The properly received number is acknowledged
in the handset by two beeps generated by the
module. Lack of acknowledgement or a busy
signal means a dialing error and then the
procedure must be started anew (to facilitate it,
you can use the REDIAL option).
4.
Enter the text of message following the
instructions below (the time of module waiting for
subsequent characters is not limited):
After calling the function, the module will accept characters in the numeric mode. Pressing
each key of the telephone adds a corresponding digit to the message.
By pressing the
[*]
key twice you will enter the text mode. In the text mode, each numeric
key (from 1 to 9) has three letters assigned to it (see: figure 5). Pressing a key means
selection of the middle letter. By pressing in turn the key and [*] you will select the left-
hand letter on the given key. The right-hand letter is accessible by pressing the given key
and [#]. In order to reach the space, press the [0] key. To reach the dash, press [0][*], the
point – press [1]. In order to change between the text mode and the numeric mode, press
the keys [0] and [#]. Pressing the [#] key when the module is in the numeric mode results
in ending the programming and sending the message.
The GSM LT-1 can store in its memory 62 alphanumeric characters to be sent as an SMS
message. At an attempt to enter a longer message, the excessive portion of the text will be
omitted. There is no possibility to check the content of entered message. If you hang up the
handset when entering the text, the function will be interrupted without sending any SMS.
9. T
EST TRANSMISSION
The test transmission makes use of the calling number presentation function (CLIP) and may
be used to confirm that the GSM LT-1 module is in good working order. This type of
messaging consists in dialing a programmed telephone number and then breaking the
connection after 50 seconds or the time specified by the operator has elapsed. The message
recipient can read information on the number of the telephone from which the connection was
initiated (cellular phone, ISDN, etc.). If the number is busy, the module will repeat the call.
The module will consider the messaging completed, if it does not receive the busy signal
within approx. 10 seconds from dialing the number. The cellular phone user has an option to
early „reject” the connection, but if he carries out this action too early, the module will repeat
the call. Answering the call, either by the user or automatically by the „voice mail”, is
recognized by the module as completion of messaging. The module will use this function to
