Texas Instruments PHP1600 User manual

Home Computer
Accessory
Texas Instruments
Telephone
Coupler
(Modern)
Model No
PHP1600
Enables your TI Home Computer to
communicate via a standard telephone.
With a TI Telephone Coupler (Modem) and
the TI RS232 Interface (sold separately),
your Home Computer can communicate
with similarly equipped computers. You can
send and receive messages and data,
transfer programsbetween Home
Computers, and access information from
consumer data services you subscribe to.
See the owner's manual for the TI RS232
Interface for details of the Home Computer's
communicating capabilities.
Copyright 1979 Texas Instruments Incorporated

In order for information to be sent or received via
the telephone system, the data output from your
computer must be converted to a different form.
The term "modem" is a combination of two
words: "modulator" and "demodulator." The
modulator part of the modem converts
information to a form that can bc sent through the
telephone system and the demodulator converts
information received through a telephone to a
form that can be used by a computer. The
features of the TI Telephone Coupler (Modem)
include:
• Compatibility with the Bell 103 type
modems.
• A built-in cable with 25-pin, male connector
for connection to the TI RS232 Interface.
•
Data transfer rates up to 300 Baud (300
Baud means 300 bits of data are transferred
per second).
• Switch-selectable HALF- and FULL-duplex
operation.
•
A TEST mode for verifying proper operation
of the modem.
• Switch-selectable ORIGINATE and ANSWER
modes.
• A UL-listed and CSA-approved low-voltage
AC adapter to power the modem.
IMPORTANT
The TI RS232 Interface is required
for the proper operation of the TI Telephone
Coupler (Modem). This unit is sold separately.
Installation
First, unpack the TI Telephone Coupler (Modem)
and its AC adapter. To hook up your modem, slide
the "Originate-Off-Answer" switch to the "Off '
position, push the power connector into the
recepticle at the end of the modem, as shown in
Figure 1, and plug the AC adapter into a standard
115-volt outlet.
,..4011114,

Power Connector Inter ace Cable
Figure 1
Originate/Off/Answer Switch
Full Test Half Switch
Next connect the modem cable to the TI RS232
Interface. Slide the switch to the Originate (0) or
Answer (A) position and check to see that the
POWER indicator lamp is lighted. Before
beginning operation, you should test your TI
Telephone Coupler to be sure it is working
properly. For the proper procedure, see the
Test
Mode section of this manual.
Operation
When you are using your computer to access data
information services you subscribe to, you will
need an RS232 Interface unit and one of the
Command Modules designed for this purpose. See
the module manual for operational information.
41.1b,
To communicate with another TI Home Computer
(or other computer), follow these procedures. One
modem must be in the ORIGINATE mode and the
other in the ANSWER mode. Prior to establishing
communications between computers, you and the
person at the remote location mutually decide
which mode of operation each of you will use.
Then, you should select the FULL-DUPLEX or
HALF-DUPLEX mode. Normally you only use the
FULL-DUPLEX mode unless an application
program or Command Module requires the HALF-
DUPLEX naode. If you decide to use the
ORIGINATE mode, slide the "Originate-Off-
Answer" switch to the Originate position. The
other person selects the ANSWER mode and
connects their phone to a modem. You should
then hear an answering tone from your earpiece.

When you hear this tone, push your telephone
handset into the acoustic muffs with the cord
toward the RS232 cable. Make sure that the phone
handset fits snugly in the muffs. When the
modem is ready to communicate, the READY
indicator will light and you may begin
transmitting information.
Figure2
If you have agreed to use the ANSWER mode,
first. slide the switch to the Answer position, and
then place the handset in the acoustic muffs just
as you did when using the modem in the
ORIGINATE mode. When your modem is in the
ANSWER mode, you will hear a tone whether or
not the READY indicator is on. When The READY
indicator turns on, you may proceed with normal
communications.
When the information transfer has been
completed, simply slide the switch to the Off
position and hang up the telephone.
The TEST Mode
As mentioned previously, your TI Telephone
Coupler has a TEST mode which enables you to
verify that the modem is working properly. The
test procedure consists of the following steps:
1.
Set the "Full-Test-Half ' switch to the middle
or "Test" position.
2.
Slide the "Originate-Off-Answer" switch to the
Originate position. You should hear a
continuous tone from the speaker muff. if not,
the modem is defective (see "In Case of
Difficulty").

3.
Select TI Basic from the Master Selection List.
4.
Enter the following program:
100 REM — TEST MODE —
110 OPEN #1: "RS232.EC.LF", FIXED 1
120 CALL KEY (0, KEY, STATUS]
130 IF STATUS = 0 THEN 120
140 PRINT #1: CHRS(KEY]
150 INPUT #1: A$
160 PRINT A$
170 GOTO 120
Then type RUN and press ENTER to start the
test program.
5.
Dial a single digit on the telephone and push
the handset into the muffs as before. Dialing
one digit eliminates the dial tone and obtains
a quiet line. Since the line will remain quiet
for only a short time. it may be necessary to
dial another digit every half-minute or so to
prevent the dial tone from interfering with the
test. An alternative method which will keep
the phone line quiet for a longer period of
time is to dial another telephone number and
ask the person answering to cover the
mouthpiece. This will keep background or
room noise from interfering with the test.
To test the ORIGINATE mode, proceed as
indicated:
6.
Wait for a READY indication.
7.
Press any alphanumeric key on the keyboard
of your Home Computer.
8.
If the key symbol appears on the TV screen,
the ORIGINATE mode is working properly.
Next test the operation of the ANSWER mode:
9.
Slide the switch to the answer position. (It is
not necessary to move the telephone handset.)
10.
Wait for the READY indicator to come on and
then press a key.
11.
Again check the displayed key symbol.
If the key symbol is not displayed or displayed
incorrectly, in either the ORIGINATE or ANSWER
modes. see "In Case of Difficulty."

In Case of Difficulty
The problem that occurs most often with a
properly connected modem is a poor telephone
connection or a noisy telephone line. This can
cause errors in the transfer of information or loss
of information. Try to obtain a clear, noise-free
line by redialing the telephone number. If the
TEST mode indicates your TI Telephone Coupler
(Modem) is working properly and you are still
having trouble, check the following table for other
sources of the problem.
TROUBLE

WHAT TO DO
READY
Indicator does
not come on:
Check to be sure power is on.
Check the position of the
handset.
(see Figure 2)
Check the position of the mode
switches.
1. When communicating with
another computer, one
modem must be in the
ORIGINATE mode and the
other in the ANSWER mode.
Usually, you and the person
at the other end of the
phone line agree on which
mode each of you will use
prior to beginning
communications.
2.
The TI Telephone Couplers
(Modems) must be in either
FULL-DUPLEX or HALF-
DUPI,EX for proper
communications. The TEST
mode will not work for
information transfers.
3.
If you are using TI BASIC
PROGRAMS, the Telephone
Couplers (Modems) must be
in FULL-DUPLEX niode.

TROUBLE  WHAT TO DO
4. If you are using a time-
sharing service, your
Telephone Coupler (Modem)
should normally be in the
ORIGINATE mode.
The modem at the other
location must be compatible
with yours. Your TI Telephone
Coupler (Modem) can
communicate with a similar T1
unit or with a Bell 103
compatible modem.
Garbled
Display
Check the handset to be sure it
is snugly seated in the acoustic
muffs.
Both your Home Computer and
the remote computer must
transfer information at the
same rate (300 Baud
maximum). See the TI RS232
interface manual for more
inlbrmation on Baud rate.
Check the telephone line. If it
sounds noisy or weak or you
hear voices, dialing sounds, or
other tones, redial the
telephone number.

Specifications
Size:  25.9 x 11.9 x 5.8 cm
Weight:  0.68 kg
Power: 
Supplied by UL-listed, CSA-
approved AC adapter with
cNonnecting cord.
Modem
Compatibility:  Bell 103
Data Interface:
 The TI Telephone Coupler
(Modem) has a built-in cable
which provides connection
to the TI RS232 Interface
via a 25-pin male connector.
Pin Connections
Pino Function 
Input/Output
0K 2 1):/ Receive Data 
Output 
Ct..)
(to Home Computer)
(f) 
3,//6 Transmit Data  Input

(i.t)
(from Home Computer)
d 7 
Signal Ground

Common
Lat.(

20 /,/ Modem Ready

Output

Service Information
If the Telephone Coupler is in warranty, it will be
repaired or replaced under the terms of the
Limited Warranty. Out-of-warranty units in need
of service will be repaired or replaced with
reconditioned-units (at TI's option), and service
rates in effect at the time of return will be
charged. Because our Service Facility serves the
entire United States, it is not feasible to hold units
while providing service estimates. For advance
information concerning our flat-rate service
charges, please call our toll-free number listed
below.
If you have questions concerning repair, please
call our Customer Relations Department at
800-858-4565 (toll free within the contiguous
United States except Texas) or 800-692-4279
within Texas. The operators at these numbers
cannot provide programming assistance.
For questions of a technical nature, you can call
806-741-2663. Please note that this is not a toll-
free number, and we cannot accept collect calls.
Exchange Centers
If your TI Telephone Coupler requires service,
4111i,
instead of returning the unit to a service facility
for repair or replacement, you may elect to
exchange the unit for a factory-reconditioned unit
of the same model (or equivalent model specified
by TI) by going in person to one of the exchange
centers which have been established across the
United States. Out-of-warranty exchanges will be
charged at the rates in effect at the time of the
exchange. Please refer to the enclosed Exchange
Service listing, or call the Consumer Relations
Department for the location of the nearest
exchange center.

Three-Month Limited Warranty
THIS TEXAS INSTRUMENTS TELEPHONE
COUPLER (MODEM) WARRANTY EXTENDS TO
THE ORIGINAL CONSUMER PURCHASER OF
THE ACCESSORY.
WARRANTY DURATION
This Telephone Coupler (Modem) unit is
warranted for a period of three (3) months from
the date of the original purchase by the consumer.
WARRANTY COVERAGE
This Telephone Coupler (Modem) unit is
warranted against defective materials or
workmanship.
THIS WARRANTY IS VOID IF THE
ACCESSORY HAS BEEN DAMAGED BY ACCI-
DENT, UNREASONABLE USE, NEGLECT,
IMPROPER SERVICE OR OTHER CAUSES NOT
ARISING OUT OF DEFECTS IN MATERIALS OR
WORKMANSHIP.
WARRANTY DISCLAIMERS
ANY IMPLIED WARRANTIES ARISING OUT OF
THIS SALE, INCLUDING BUT NOT LIMITED TO
THE IMPLIED WARRANTIES OF MERCHANT-
ABILITY AND FITNESS FOR A PARTICULAR
PURPOSE, ARE LIMITED IN DURATION TO THE
ABOVE THREE-MONTH PERIOD. TEXAS
INSTRUMENTS SHALL NOT BE LIABLE FOR
LOSS OF USE OF THE TI TELEPHONE
COUPLER OR OTHER INCIDENTAL OR CONSE-
QUENTIAL COSTS, EXPENSES, OR DAMAGES
INCURRED BY THE CONSUMER OR ANY
OTHER USER.
Some states do not allow the exclusion or
limitation of implied warranties or consequential
damages. so the above limitations or exclusions
may not apply to you.
LEGAL REMEDIES
This warranty gives you specific legal rights, and
you may also have other rights that vary from
state to state.