QUASAR CODES 3140 - DTMF Telephone Relay Switcher
Page
3
When fitting the MJE340 transistor, Q1, check the
PCB overlay first. The thick ‘line’ on the PCB
indicates the
back
of the transistor which may have a
metal surface. If not then use the markings on the
transistor – they indicate the
front
of the transistor.
Make sure the power jack is facing straight out, not
skew. We have made the front panel hole 0.320” which
will tolerate some shewness.
When mounting the connectors make sure they are
sitting right down on the PCB before soldering.
Do not insert any ICs yet!
We are now going to fit the assembled PCB into the
plastic case. Before that check all your work carefully.
Look for unsoldered joints and any solder bridges or
splashes that may be shorting out adjacent pins.
Now comes assembly of the front panel. Start by
inserting the LED clip into the hole, pushing it in from
the front. Now insert the LED into the clip
from the
rear
. The LED should “click” into place.
Turn the LED in the clip so that the long lead is to the
right (as viewed from the front).
This is very
important so make sure it is right.
Now bend the
leads down at right angles, about 3mm from the LED
body, as shown below. Use a pair of long nose pliers to
hold the leads while bending. Cut the leads off to a
length of about 9mm from the bend.
Fit the front and rear panels to the PCB. Be sure that
the LED leads are inserted into their matching holes on
the PCB. While holding the panels in place slowly
position the PCB into the base of the plastic case,
making sure that the front and rear panels slide into the
slots provided. Secure the PCB to the case using the
self-tapping screws then solder the LED leads
from
the top of the PCB.
Do not fit the plastic case lid just yet. Proceed to the
next section ‘PRE-TESTING’. Now fit the plastic case
lid and secure it in place.
For 2 photos of the completed kit see
http://www.
quasarelectronics
.com/jpg/
3
140_1.jpg
http://www.
quasarelectronics.
.com/jpg/
3
140_2.jpg
PRE-TESTING
Insert IC7 (MAX666) and connect a 12
-15
V
dc
power
supply to the DC input jack. Use a multimeter to check
the 5V supply. Easiest place to measure this is across
pins 20 (+) and 10 (-) of the IC4 socket. If all is well
then remove power and insert the rest of the ICs into
their sockets. Check that the IC legs are actually inserted
into the socket and not accidently bent up underneath
the IC body (quite a common fault).
USING THE
UNIT
FOR THE FIRST TIME
Before you can use the
unit
for the first time the various
user settings must be set to their ‘default’ values. To do
this,
press AND hold the 'Password Reset' button
while powering up the kit. Hold the button down for
a further 2 seconds before releasing it.
This procedure
is also used you user forget the password.
The
default
value for each setting is:
Password ................. 0000
Tamper .................... 3
Rings to answer ....... 3
Auto hangup ............ 30 seconds
Lockout ................... Disabled
Each of these settings can be changed by the user to suit.
CONNJECTION
AND OPERATION
Protect unit from power surge & lightening strike damage.
Connect the unit to the phone line using a suitable cable (and
filter if the line has broadband). Only the two inner pins of the
RJ-11 plug are used. Some cables do not – check before using!
Connect a 12-15Vdc centre positive REGULATED power supply
.
On first use please
follow the procedure described previously to
set the user
settings to their default values. The
unit
is now ready
for
incoming calls.
Dial the phone number to which the kit is connected.
After 3 rings it will answer with 4 short beeps. Type in
the password (0000) followed by the '#' key. If the
password is correct the kit will respond with 4 short
beeps. It is now waiting for a command.
COMMANDS
A command is a string of characters starting with *
or # and ending with a #.
Entering a * at any time after the first character aborts
and starts again.
1.
*<1-4>#
- operate one of the four relays 1,2 3 or 4.
2.
#<1-4>#
- release one of the four relays 1,2,3 or 4.
3.
*5#
- set password
4.
*6#
- set tamper setting
5.
*7#
- set number of rings to answer
6.
*8#
- set auto hangup time
7.
*9#
- set lockout time
8.
*0#
- forced disconnect
9.
#0#
- release ALL relays