Tandy 1400LT, User Manual

Page 1: ...Cat No 25 3510 1200 bps Modem For Tandy 1400 LT User s Manual...

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Page 3: ...i ft ft ft 1200 bps Modem for Tandy 1400 LT User s Manual 1987 Tandy Corporation All Rights Reserved...

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Page 5: ...m with a Database 1 2 1 4 Easy to Use 1 3 1 5 Introduction to Modem Features 1 3 1 6 How to Use this Manual 1 3 Chapter 2 Installation 2 0 Getting Ready 2 1 2 1 Connecting Your Tandy Modem to the Tele...

Page 6: ...l Modem Command Mode 4_1 4 1 Functional States 4_1 4 2 Changing of States 4 2 4 3 Command Syntax 4 4 4 4 Command Results 4_5 4 5 Speed of Transmission 4_g 4 6 Dialing with Examples 4 9 4 7 Auto Answer...

Page 7: ...The Set Command 6 1 6 2 Reading and Changing Registers 6 2 6 3 Register SO Auto Answer 6 3 6 4 Register SI Rings Passed 6 4 6 5 Register S2 Escape Code ASCII Value 6 4 6 6 Register S3 Command Termina...

Page 8: ...6 11 6 17 Programming Suggestions and Considerations 6 15 6 18 Command Executions 6 15 6 19 Escape Code Precaution 6 16 Appendices Appendix A ASCII Code Chart App 1 Appendix B Technical Information Ap...

Page 9: ...n with mainframes minis or personal comput ers and transfer files The Tandy system you have purchased contains several elements 1 The modem card 2 A modular telephone cable 3 This manual which provide...

Page 10: ...up to make a call Your modem is expecting another modem at the other end to answer the call Conversely you can set your modem to the Answer Mode meaning that any time a call comes in your modem will...

Page 11: ...chedules or check your bank bal ance from the comfort of your living room In the future the uses for your modem will continue to grow 1 5 Introduction to Modem Features Your modem has many advanced fe...

Page 12: ...Chapter 1 Chapter 3 covers testing the modem More technical information about the modems internal command set is included in Chapters 4 through 6 1 4...

Page 13: ...modem is FCC registered for direct connection to the telephone line Before proceeding you should call your lo cal telephone company and inform them that you are going to connect registered equipment...

Page 14: ...d States 2 2 Connecting Your Modem to Your Computer The following steps will explain installation of your 1200 bps inter nal modem in your computer PLEASE FOLLOW THESE IN STRUCTIONS CAREFULLY NOTE Whe...

Page 15: ...v v SCREWS To Install 1 Remove the slot cover over the Modem Option slot on the back of the computer It is held in place by two small s crews 2 Gently slide in the modem as illustrated Press in to ens...

Page 16: ...modem into either of these two jacks These jacks are identical it does not matter which one you use Connect the other end of this modular cable into your wall jack NOTE The second jack on the back of...

Page 17: ...g down the Ctrl and Alt keys press the Ins key This will bring up the Tandy 1400 LT Set Up Menu 6 Press the F4 key to highlight the RS232C Internal Modem option Press the right arrow key to highlight...

Page 18: ...o answer function is controlled by the SO register If you wish to disable auto answer access the modem command set with your communications software and enter the command ATS0 0 CR See section 4 7 for...

Page 19: ...l Analog Loopback Test These tests check the modem s Originate and Answer modes Be fore you perform these tests disconnect the phone cable from the wall jack to the modem If this cable is not disconne...

Page 20: ...y you press should match the character displayed on the screen 4 To exit the test enter Do not enter CR after The modem responds OK 5 If you do not wish to test the answer mode proceed to step 7 Now i...

Page 21: ...o re quest the remote modem to loopback data sent to it The RDL feature allows you to make a complete unattended test of the re mote modem Your local modem sends the data over the phone lines to the r...

Page 22: ...it 4 To end the test enter 5 Modem should respond OK You are now in command mode 6 Enter AT01 CR 7 Modem responds CONNECT The test is ended Notes 1 RDL is automatically terminated when the connection...

Page 23: ...orrectly either your mo dem the remote modem the data equipment or the phone lines are at fault If you have already successfully performed the local analog loopback test you know that your modem and c...

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Page 25: ...ter the command AT Z CR t which will set the modem options to their default values 4 1 Functional States The modem will always be in one of two states local command state or on line state In the local...

Page 26: ...n line state is also achieved when the modem answers a call When the carrier is lost for whatever reason the modem auto matically returns to the local command state The modem will not respond to local...

Page 27: ...ng into command mode during normal operation The one second guard time surrounding the escape code tells the modem that is a command to the modem not just a stream of data The default values of the es...

Page 28: ...ber of commands given at once is limited by the line length which cannot exceed 40 characters following AT Control characters and spaces are not counted but punctuation marks such as dashes or commas...

Page 29: ...elete the attention code AT Note that when backspacing over a space the space is ignored and the next character is erased regardless of whether or not it appears properly on the screen Null Parameters...

Page 30: ...ted The phone is ringing RING only indicates that the phone is ringing The modem does not answer it unless commanded to or unless auto answer is en abled Carrier was not detected or was lost NO CARRIE...

Page 31: ...appears only when the mo dem is dialed using the command See Section 4 7 VO and VI are the modem commands that determine whether the modem is to render numeric or verbal result codes respectively The...

Page 32: ...dem will not change the speed of the equipment If the 1200 bps internal modem is in answer mode it adjusts to the speed of the calling modem You can use the X command to tell the modem to inform you o...

Page 33: ...ich appears on your screen e g CONNECT 1200 for a 1200 baud call In the de fault setting of X0 the modem will return only the message CON NECT 4 6 Dialing with Examples Since dialing and answering are...

Page 34: ...l hang up and send a NO CARRIER BUSY 3 or 7 result code depending again on what parameters have been set In its factory default setting XO the modem would respond CONNECT when the modem connects no ma...

Page 35: ...ple AT DTW767 8900 CR Meaning Wait for a dial tone then dial the number using tones Note that the W com mand MUST be preceded by the D command Note This command tells the modem to wait for 3 seconds o...

Page 36: ...internal modem does not detect 5 seconds of silence the modem will return a result of NO ANSWER and hang up If it de tects a busy signal the modem will return the BUSY result code Note This command t...

Page 37: ...one Dialing Pulse Dialing Example AT DP9 T 767 8900 CR Meaning Dial 9 using pulse rotary dialing pause for two seconds dial the rest of the number using touch tone Note When the modem is turned on it...

Page 38: ...ill continue to hear the call being made as in normal operation Example AT D 767 8900 CR Meaning Dial the phone number and return for command R Reverse Mode Used to call an originate only modem such a...

Page 39: ...ed to the dialing sequences are controlled by reg isters S6 through SI 1 See Chapter 6 for a complete listing of all of the registers functions and values 4 7 Auto Answer Mode The modem is set to auto...

Page 40: ...reen in the default setting of the X command X0 If no carrier is detected within 30 seconds default time the mo dem will return a NO CARRIER result code again in the default value of the X command han...

Page 41: ...ription 5 1 A Answer Immediately Default Parameter Parameter Command Value Range Description A Sending an A command to the modem tells it to answer immedi ately without waiting for a ring It then will...

Page 42: ...ast Command Default Parameter Parameter Command Value Range Description A A This command will repeat the last command line It is most useful when used to re dial the last number dialed ttttiiiimmttmtm...

Page 43: ...ling a number results in a connection after an A command detects a Carrier from the other end At all other times the Carrier signal is not output If CO is en tered the Carrier signal is never output T...

Page 44: ...al a number but adjust dialing to the local telephone conditions as well The set of sub commands include Pause for dial tone T Touch tone dialing P Pulse rotary dialing R Reverse mode Return to Comman...

Page 45: ...e terminal is in half duplex both it and the modem will echo the character on the screen resulting in double printing To pre vent this turn the modem s echo off AT E0 CR The echo feature is only activ...

Page 46: ...our screen since both the modem and the computer are echoing characters Change the modem to full duplex If both the computer and the modem are set for full duplex no characters will appear on the scre...

Page 47: ...e CARRIAGE RETURN CR is en tered the Carrier Signal is terminated and the connection put on hook Notice that no parameter was entered in this example hence a entry is assumed 5 8 M Monitor Speaker Con...

Page 48: ...em at the other end is malfunctioning f n ii i h i i ii i niiiiiiin v v f Example AT M CR This command is used to turn off the speaker so that no signals are sent to the speaker Notice that no paramet...

Page 49: ...ering or exiting RDL Consult Chapter 3 of this manual for information on how to perform these tests 5 10 P Pulse Dialing Command P Default Value Parameter Range Parameter Description Before a Dial is...

Page 50: ...d is set with this com mand For example the command Ql would be used when you are using the modem with a receive only printer This command would prevent the result codes from being printed out 5 12 R...

Page 51: ...rtain opera tional characteristics All of the characteristics have a default value set when the modem is turned on or reset However they can be changed see the next command if needed For a description...

Page 52: ...lue Range Description Before a Dial is attempted the modem must be told whether pulse rotary dialing or touch tone dialing methods should be used This command sets the modem so that all numbers output...

Page 53: ...tered to render numbers instead of words See Section 4 5 for an explanation of the words and their corresponding numbers along with the mean ing of each Recall that words are recommended when the resu...

Page 54: ...AT DT W 767 8900 CR This command tells the modem to wait for a dial tone before dial ing the number using touch tone See Section 4 7 for more infor mation on the W command 5 18 X Extended Result Code...

Page 55: ...ftware written for the AT modem command set does not accept the extended result codes 5 through 10 so the de fault XO is used 2 The NO ANSWER result code is returned only when the mo dem is using the...

Page 56: ...several results when the modem is reset any call in progress is terminated all commands are reset to the default values all commands after the Z command in a command line are NOT executed t iL iZ iZh...

Page 57: ...s memory space that control certain opera tions Every time the modem is turned on or reset with the Z command the default values are set This means that if changes are required to one or more register...

Page 58: ...ce character S6 2 255 seconds 2 Wait time for dial tone S7 0 255 seconds 30 Wait time for Carrier S8 0 255 seconds 2 Pause time S9 1 255 1 10 sec 6 Carrier detector response Hang up delay after loss o...

Page 59: ...wo seconds for a dial tone OK End of sequence To change the value in these registers you would use the Sr n command Using the same registers as the previous example you would enter AT S0 4 CR Change t...

Page 60: ...r AT SI CR The SI register counts the number of times the phone rings This register is cleared after 8 seconds have passed without a ring Note that there is no need to change the value of this registe...

Page 61: ...escape character three times e g 3 Wait 1 second see register S12 to change Notice that both the Escape Character AND the Guard Time the time period in steps 1 and 3 can be redefined 6 6 Register S3 C...

Page 62: ...y if you do not want or need a line feed at this time 6 8 Register S5 Back Space ASCII Value To Display Modem To Change Status Enter Displays Status Enter AT S5 CR 8 Do not change n 0 127 The S5 regis...

Page 63: ...s In this case increase the value of the S6 register until a satisfactory delay is established Note that rt n is a value expressed in seconds 6 10 Register S7 Wait for Carrier Time Period To Display M...

Page 64: ...sten for the intermedi ate dial tone unless you use the W command it just delays for a period and assumes that the tone is present Consequently if a 3 or NO CARRIER result code is rendered frequently...

Page 65: ...ult value Increasing this value further decreases the likelihood We recommend against changing this value to a shorter period how ever Note that the value in register S9 is a value expressed in 1 10 s...

Page 66: ...1 seconds When telephone lines are poor the value of S10 can be increased if disconnects are frequent The adverse effect of this command is that some garbage characters may appear on the screen if th...

Page 67: ...illiseconds to the delay Consider 50 as the minimum and increment only in value of 50 s 1 second NOTE A value of is certainly possible in this register In this case entering three Escape characters wi...

Page 68: ...Bit Value Description not used 1 1 Extended Result Codes disable Extended Result Codes Set 2 1 Parity Disabled Parity Enabled 3 1 Odd Parity Even Parity 4 1 7 Data Bits word 8 Data bits word 5 not use...

Page 69: ...abled 1 Local Echo Enabled 2 Result Codes Enabled 1 Result Codes Disabled 3 Result Codes as Numbers 1 Result Codes as Words See Vn command 4 Undefined may be 1 or 5 Pulse dial 1 Tone dial 6 1 Speaker...

Page 70: ...r Originate Half duplex Full duplex Bits 4 and 5 define the bps rate as shown in the following table Bit 4 1 1 Bit 5 1 1 Bps Rate 110 300 1200 7 Carrier Off Carrier On undefined S16 Test Mode Bit Valu...

Page 71: ...entered when the modem is in the On line State are considered data and will be output as such Be sure to en ter the Escape Code before entering commands 3 Data output by the computer when the modem is...

Page 72: ...Escape Code Precaution In some contexts it may be desirable to disable the Escape Code e g when the modem is in answer mode while attached to a com puter operating in half duplex The reason for this i...

Page 73: ...hex and decimal value of the character Decimal Value 00 01 02 03 04 05 06 07 08 09 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 App l Keyboard Character Hex Value A 00 A A 01 B 02 A C 03 A D 04...

Page 74: ...IB 27 1C 28 A ID 29 IE 30 IF 31 space 20 32 I 21 33 22 34 23 35 24 36 25 37 26 38 27 38 28 40 29 41 2A 42 2B 43 2C 44 2D 45 2E 46 2F 47 30 48 1 31 49 2 32 50 3 33 51 4 34 52 5 35 53 6 36 54 7 37 55 8...

Page 75: ...45 F 46 G 47 H 48 I 49 J 4A K 4B L 4C M 4D N 4E O 4F P 50 Q 51 R 52 S 53 T 54 U 55 V 56 w 57 X 58 Y 59 Z 5A SB 5C 5D 5E 5F 60 Appendix Decimal Value 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79...

Page 76: ...66 g 67 h 68 i 69 J 6A k SB 1 6C m 6D n 6E 6F P 70 q 71 r 72 s 73 t 74 u 75 V 76 w 77 X 78 y 79 z 7A 7B 1 7C 7D 7E rub 7F Decimal Value 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 11...

Page 77: ...ELEPHONE PIN NUMBER JACK POSITION NO MODEM JACK 3 4 5 1 TIP RING RJ11C PLUG 3 4 5 2 Specifications Modem Compatibility Dialer Compatibility Modem Data Rate Speed Selection Originate Mode Answer Mode B...

Page 78: ...ed Receiver Sensitivity 45 dBm Transmit Level 10 dBm Tone Dial Level dBm Line Impedance 600 Ohms Ringer Equivalence 0 4B Modulation 300 baud Frequency Shift Keyed FSK 1200 baud Differential phase shif...

Page 79: ...d Buffer 40 characters Speaker Normally on during dialing can be turned off by command Technology Low power CMOS circuitry utilizes proprietary LSI modem circuits 8051 microprocessor Control pro gram...

Page 80: ...ts on many key systems The mini jumper is shipped in the off position to avoid possible problems if you have two separate telephone lines at your home or office The telephone company frequently wires...

Page 81: ...anging of States 4 2 C Command 5 3 Command Executions 6 15 Command Results 4 5 5 13 Command State 4 2 Command Syntax 4 4 Commands line limits 4 4 Communications Mode 5 5 D Command 4 9 5 4 Dialing Basi...

Page 82: ...Test 3 1 Pulse Dialing 4 13 5 4 Q Command 5 10 R Command 4 14 5 10 Reading and Changing Registers 6 2 Registration FCC 2 1 Remote Testing Chapter 3 Registers Auto Answer 6 3 1 Rings Passed 6 4 2 Escap...

Page 83: ...mand Return to On line see O command Reverse Mode 5 10 Ringer Equivalence 2 1 Set Command 6 1 Speaker Control 5 7 Speed 4 8 Status Registers see registers Sr Command 5 11 Sr n Command 5 11 System Rese...

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Page 86: ...TION U S A FORT WORTH TEXAS 76102 CANADA BARRIE ONTARIO L4M 4W5 TANDY CORPORATION AUSTRALIA 91 KURRAJONG AVENUE MOUNT DRUITT NSW 2770 BELGIUM PARC INDUSTRIEL 5140NANINNE NAMUR BILSTON ROAD WEDNESBURY...