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a,
g
Flag for Self-Test
The
Q
command is one of several toggling commands that the DC-2212 modem uses.
When power is first applied to the modem, the listing line AN AL 0 G L 0 0 P: N tells
you that the modem is not selected to go into an analog self-test mode when it exits the
command receptive state. When the line reads AN AL 0 G L 0 0 P: Y, then the modem is
ready to enter the self-test mode upon exiting the command receptive state.
You can press
00
as many times as you like
.
Each time the key is pressed (toggled)
,
the state of the modem's internal switch is changed from no to yes and back again. The
self-test mode does not start until the command receptive state is exited.
The analog loop self-test mode forces the modem to talk to itself. The internal switches
are selected such that data transmitted from the computer is looped back to the receiver
and processed just as if it were in communications over the telephone lines. Keys
entered from the computer are echoed to the screen.
Using this feature, you will be able to tell if the modem is functioning correctly
.
The
analog loop self-test does not test, nor analyze, the condition of your telephone circuits,
since this mode does not communicate over the lines.
D,d
Dialer ro ramming mode enable
--~~~~~~~~~~~~~~
The D command tells the DC-2212 that you are about to send a string of characters
which are to be stored in its dialer memory
.
To enter the dialer programming area
,
press
CID
and use the format:
DnumberX
where
number
is the telephone number you want to dial and X is the command
that forces the modem out of command receptive state and to seize the phone lines
and begin dialing the number.
Up to 40 characters can be entered in this dialer memory. These characters can be
reviewed (use the L command) by looking at the first line of the modem
'
s parameters
list after PH 0
NE N
0 : . Of course
,
this space will be blank if the modem was freshly
powered on
.
If you enter more than 40 characters in this memory or use an invalid character, the
dialer programming mode is aborted and the modem returns to the
comm~nd
receptive
state. Table 4 provides a list of the codes that are valid to the modem.
27
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