Midian TRA, Instruction Manual

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period of time entered here, it will force disconnect.
This is a safety feature to prevent the TRA from
tying up the system when a handset is inadvertently
not placed back on hook. Setting this to 00
disables this feature; setting it to 01-99 delays
disconnect for that many seconds.
•
Call Reminder Interval: This sets the length of
time between reminder rings. After decoding a call,
the TRA will ring for the time programmed in the
Ring Period in Decoding Parameters . If the call
is not answered during the ring time, the TRA will
produce a very short reminder ring (approximately
160 msec) to tell the user that a call was received
during his absence.
4. P
ROGRAMMING
Attach a standard telephone to the TRA "PHONE" input.
Take phone off hook, then depress and hold down the "#"
button. While monitoring "TP3" with an oscilloscope,
adjust R27 for a reading of 650 mv (P. to P.) This is a
preliminary setting to produce an adequate DTMF level for
programming the TRA.
4.1. Entering Program Mode
Press # and hold it down while taking the phone off hook.
Release the #, and two beeps will be heard. Enter the
following number sequence on the telephone keypad:
2 7 1 8 2 8 1 8 2 8 4
After this has been entered, the unit will beep three times,
indicating that programming mode is active.
4.2. Programming a Location
To change the contents of a system parameter, key in the
required data and press
* nn
where nn=location 01-14. If fewer digits are entered than
the register requires, trailing zeros are assumed. Extra
digits are ignored.
For instance, to enter the sequence 1234 as the connect
ANI, enter:
1 2 3 4 * 04
To exit the programming mode, press
* 00
The unit will respond with a long beep and resume normal
operation.
The DTMF characters A, B, C, D, *, and # are
programmed by using a quick flash on the hook switch,
which allows the
2, 5, 8 , and 0 buttons to represent A-D.
(The middle column of the telephone keyboard replaces
the fourth column on a 16-button keyboard.) The * and #
characters, with a quick flash on the hook switch,
represent themselves. This is necessary for the * and #,
because # serves as a clear key, and * serves as an entry
key during normal operation.
For example, to program the connect ANI with the number
12A* , it would be necessary to enter the following
sequence:
1 2 <flash>2 <flash>* *04
4.3. Programming the Memory Dial Numbers
Press # and hold it down while taking the phone off hook.
Release #. Two beeps will be heard. Key in the number
0 0 0 0 0 0 . The unit will respond with three beeps
indicating that the memory locations are unlocked.
Key in each number (up to 11 digits), and press * followed
by 0-9. The unit will then store the number into the
memory dial location selected, and will beep twice to
indicate successful programming.
To exit programming mode, hang up the telephone.
For example, the number 520-884-7981 would be stored
in memory dial number 3 by the following steps:
1. To enter programming mode, press # while going
off hook, release #, and then dial 000000 .
2. Enter the number 5208847981 .
3. Press *3 to store the number.
4. Exit programming mode by hanging up the
telephone.
5. TRA S
ETUP
P
ROCEDURES
Program the unit as desired using the programming
sheets on page
Error! Bookmark not defined. . Pay
particular attention to setting the COR polarity, as this
controls the Busy Channel Lockout and Busy Tone. Also,
set the VOX timing to a comfortable setting; we
recommend .5-.8 seconds. You may want to let your
customer make the final determination on the VOX timing.
5.1. In-Plant Paging Setup
When the telephone handset is taken off hook, a dial tone
will be heard if
Dial Tones is set to 1. Enter the desired
two-tone or five-tone paging code and set the modulation
to 3.3 KCs using Mod Pot R58.
Then, using the "5" button on the Touch Tone phone, set
modulation to about 3.3 KCs using TX Audio Gain Pot
R27. Peak voice should now be going out at about 4 KCs,
assuming the radio was properly set at 5 KCs maximum.
The TX Audio Gain Pot R27 should be approximately mid-
range for most telephones. The voltage on Pin 1 of U5
TP1 should be approximately 1.25 Volts peak to peak
when pressing the "5" on the Touch Tone phone.
If the injection point to the radio is Low Z and the
maximum tone output level is insufficient, install jumper
JU6, which shorts out R59, lowering the output
impedance. Then repeat above steps.
Using a service monitor, with a 1 KC test tone set to 3.5
KC of deviation, inject an RF signal into the receiver
sufficient to quiet it, and set RX Gain Pot R34 so that test
point 2 is set at 1.5 vp-p (500 mV RMS).