Tandy DCM212, Operation Manual

Page 1: ...hql nit TANDY 1200 Bps Intelligent Modem DCM212 OPERATION MANUAL cat no 26 1385...

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Page 3: ...programming sessions 13 Manual mode operations 17 Automatic mode operations 20 Analog self test mode 24 ON LINE mode abort 24 Result codes 27 3 Hayes protocol mode operation 29 Command codes 29 Regis...

Page 4: ...ource 78 D XENIX operations 79 Optional modem configurations 81 Multi line phone operation 81 RS 232C protocol extension 81 F Troubleshooting 83 Maintenance 83 Analog loop self test 84 G Specification...

Page 5: ...sters Hayes 35 Table 8 Result Codes Hayes 39 Table 9 Programming Commands Tandy 44 Table 10 Valid Dialer Codes Tandy 44 Table 11 Dialer Codes Hayes 60 Table 12 Dialing Conditions in X Command Mode Hay...

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Page 7: ...Stan dard Code for Information Interchange encoded commands that you program from your computer keyboard over the serial RS 232C inter face Roughly equivalent to a telephone operator making a call th...

Page 8: ...sually on your display with mes sages called results codes Sample programming sessions are provided in each section of this manual to help familiarize you with the various functions of the DCM 212 and...

Page 9: ...T5T Figure 1 Front Control Panel Power switch turns the Modem ON or OFF Be sure to turn it OFF when the Modem is not being used POWER indicator lights when power is on HI SPEED indicator lights when t...

Page 10: ...DIP switches control the Modem s power up con dition refer to PROTOCOL DIP switches later in this section PHONE jack connects the telephone to the Modem POWER jack connects the Modem to the AC power a...

Page 11: ...mode or the attention code in Hayes protocol mode When the Modem detects 1200 bps after receiving the code sequence it will communicate in high speed If it is awakened at 300 bps low speed operation...

Page 12: ...with Hayes communications software set it to the Hayes protocol mode Both the Tandy 1000 and 1200 personal com puters can be used with either communications software Tandy Protocol When you select Ta...

Page 13: ...mputer to 1200 bps before turning the Modem on Table 1 DIP Switch Settings in Tandy Protocol Mode SW Position Function 1 Should be OFF 2 Should be OFF 3 ON OFF No function Set the Modem to Tandy proto...

Page 14: ...operation COMMAND ECHO OFF TRUE CARRIER i TANDY PROTOCOL AUTO ANSWER DISABLE n I NUMERIC RESULT CODES ENABLE COMMAND RECOGNITION SEND RESULT CODES TRUE DTR r iH y k y H H B 01 N 2 3 4 5 G 7 8 J j AUT...

Page 15: ...ommand recognition Modem does not recognize commands OFF Enables command recognition Modem recognizes commands 7 ON Result codes disabled disables Switch 5 OFF Result codes enabled enables Switch 5 8...

Page 16: ...is mode you can control what the system does by manually dialing and answering the phone When you want the DCM 212 to dial a phone number or answer the phone for you set it to automatic operation mode...

Page 17: ...on self test in Appendix A Tandy protocol reference or in Appendix B Hayes protocol reference If you plan to use the DCM 212 in Tandy protocol mode only you may skip Chapter 3 and Appendix B However...

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Page 19: ...ip to Appendix D For a detailed discussion of all the available commands in Tandy pro tocol refer to Appendix A Sample programming sessions All Modem functions are controlled by ASCII encoded commands...

Page 20: ...the internal switches that will tell it what operations are to be performed 8 When the echoes on your computer screen press T for the LIST command to display or list the Modem s current parameters Whe...

Page 21: ...c cess number the sequence appears as DC 111 555 1234 2 When the phone number is properly formatted see D command Tandy protocol reference press x to force the Modem to execute the switches and seize...

Page 22: ...phone lines for incoming calls enter Wake up A Select answer mode X Do it The Modem prompts the screen by sending the message WAITING FOR RING and waits for the telephone to ring To change the operati...

Page 23: ...low these steps Wake up I Bring the advanced programming options to the screen 1 Press ENTER The DIAL ATTEMPTS prompt appears on the screen DIAL ATTEMPTS ii 2 Change the default number to a value othe...

Page 24: ...ugh the built in speaker or when you pick up the receiver while the Modem is in communica tions with another modem It sounds similar to running water or static during high speed operation and is a ste...

Page 25: ...he CTRL key refer to your computer manual to find out the key of hex value 14 or change the abort charac ter using abort character redefinition Refer to Appendix A command Example 2 Manual originate m...

Page 26: ...t answer mode The display shows A To check that all the parameters are set correctly press CD for the list command and look for the ORIG MODE and MANUAL MODE parameters Then press X to force the Modem...

Page 27: ...ke the Modem out of the answer mode The ring number is set to 2 at power on This means your Modem will seize the phone line after 2 rings When you want to change this num ber use the I command Example...

Page 28: ...back busy signal or re order signal Line condition 1 ring back When the Modem hears the phone ring the message RINGING is displayed Each ring cycle detected by the Modem is counted until the ringing s...

Page 29: ...mpleted the message CONNECT is printed to the display Line condition 3 re order tone The re order tone is a beeping tone the telephone company uses to tell you that something is wrong Either your Mode...

Page 30: ...in communications over the telephone lines Loss of carrier Loss of data terminal ready DTR Reception of a long space Transmission of the abort character Condition I loss of carrier The carrier is the...

Page 31: ...hat you may use the Modem Of course if your cable connection is incorrect and the DTR pin at the Modem is shorted out you will never be able to get the Modem to talk On computers with DTR control you...

Page 32: ...m I m alt done Go ahead and turn off The long space method of disconnecting a modem from the lines is known as a long space disconnect sequence Remember you can turn this feature OFF with the command...

Page 33: ...y Modem is dialing the number that follows Ringback tone detected Busy signal detected Reorder tone detected Call was not answered after 8 ringback tones No dial tone detected Detects carrier at 300 b...

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Page 35: ...ll automatically set the operation speed and parity You can store a sequence of commands in the command buffer memory provided the command line does not exceed the 40 character buffer capacity These c...

Page 36: ...mode are provided in Table 4 Table 6 lists the dialing and answering commands For a detail explanation of each command refer to Appendix B Hayes protocol reference Table 4 Basic Command Codes Code Des...

Page 37: ...F M C H Result codes ON 1 Result codes OFF Numeric result codes 1 Verbal result codes Basic result code set 1 Extended result code set 2 Advanced result code set Enables advanced dialing subcommands...

Page 38: ...ng Sets the Modem to touch tone dialing mode Reverse Mode Changes the Modem to answer mode auto matically after a call is originated Pause Causes the Modem to pause when dialing Place it after the acc...

Page 39: ...ime and register S16 is for the self test S13 S15 are the bit mapped registers With the exception of the last 3 bit registers you can read the current value of a register or assign a new value to matc...

Page 40: ...assign the value 3 to register SO type AT S0 3 ENTER After changing the value the Modem signals OK Another syntax for changing a register value is AT SO ENTER Set the pointer to register SO AT ENTER R...

Page 41: ...nes CR code character Defines LF code character Defines BS code character Defines dial tone wait time Defines carrier wait time Defines pause duration for comma Although you can input a value up to 25...

Page 42: ...board is used for the examples following 1 Power up the computer and load your communications software Before turning ON the Modem set DIP switches on the DCM 212 as follows 01 N y 2 3 4 y 5 6 7 8 2...

Page 43: ...Type in the telephone number of the infor mation service and press ENTER 3 After the connection has been made successfully proceed with the logon procedures step by step Automatic logon 1 At the TELEC...

Page 44: ...nes whether the result codes will be displayed as numeric VO or verbal VI codes The default value of these controls is fixed by DIP switches For example when DIP Switch 7 is set to ON these result cod...

Page 45: ...signal Q Q O 3 NO CARRIER Carrier was lost or never UJ UJ o a CO heard z z a s UJ 1 4 ERROR Error in the command line or G X UJ the command is invalid not recognized by the Modem or the character form...

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Page 47: ...Appendices...

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Page 49: ...respond to while in OFF LINE mode from power up It forces the Modem from the off line status to the command receptive state CRS To send the wake up command from your computer or terminal key board pr...

Page 50: ...peed Flag for self test Dialer programming mode enable Redefine abort chartacter Manual automatic toggle command automatic default Forced carrier detect toggle Echo disable enable command Advanced pro...

Page 51: ...de N AnaFog self test Y Originate mode N Manual mode Y Force carrier to terminal Y Default to pulse dialing Y Default to slow dialing Note The second parameter 10 BITS CHR is not displayed when the Mo...

Page 52: ...lly assumes another carriage return upon reception of a line feed code the list will appear double spaced M m Manual automatic toggle In manual operation mode you can control what the system does by m...

Page 53: ...originate mode A a Answer mode operation The A command places the DCM 212 in answer mode Unless you indicate otherwise with this command the Modem is defaulted to operate in originate mode Use the an...

Page 54: ...ne dial R r Rotary pulse dialing default At initial power up the rotary or pulse signaling global command is defaulted This means the Modem will auto originate a call for you using pulse signaling unl...

Page 55: ...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 com municate over the lines The Q c...

Page 56: ...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 Mo...

Page 57: ...dy described When the Modem sees one of these characters in the number string it uses that type of signaling from that point on Switching signaling types on the fly is useful when you are using long d...

Page 58: ...smit the password Return to command mode D 273 65 X Enter the transaction Return to command mode C Terminate the call BS Backspace Non dialable digit Erases the last key stroke entered in the dialer m...

Page 59: ...carrier detect toggle This toggling command controls the carrier detect signal applied to the computer or the terminal When freshly powered on the DCM 212 is commanded to force a carrier signal to you...

Page 60: ...CARR SEND SPACE RECEIVE SPACE ABORT ENABLE SPKR ENABLE 2 1 8 Y N Y Y Y Press CD to bring the first prompt of this menu to the screen When power is initially applied to the Modem the values shown in th...

Page 61: ...ess than 4 LOSS OF CARR Y Once the Modem is ON LINE with another computer there are several conditions which will cause the system to disconnect from the tele phone line and go into the waiting mode O...

Page 62: ...for some reason you decide to turn OFF these disconnect options there are only two ways you can force the DCM 212 to go back ON HOOK Turn OFF DTR or turn OFF the power switch SPKR ENABLE Y Use this to...

Page 63: ...command tells the Modem that you have set up the DCM 212 the way you want it and now is the time to execute your instructions The Modem will do one of three things 1 Enter a waiting state and monitor...

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Page 65: ...mode When you input escape code the Modem returns to command mode and displays the result code OK The telephone line will still be connected until you input HO ON HOOK command or Z Reset command The e...

Page 66: ...re the manual answer command For example AT F1 A ENTER Wake up Select full duplex Wait for a carrier tone D d Autodial command The D command sets the Modem to originate a call without using a telephon...

Page 67: ...dition is determined by the Q command DIP Switch 7 and the type of the code is determined by the Vcom mand DIP Switch 5 Q q Result codes ON OFF command Determines whether the result codes will be sent...

Page 68: ...e as XO mode Displays REORD ER TONE and aborts dialing Gets no answer Displays NO CAR RIER and aborts di aling after the time set by S7 Same as XO mode Displays NO AN SWER and aborts dialing after 8 r...

Page 69: ...ablish communication with an originate only modem When R is entered the Modem dials the tele phone number originate mode then enters answer mode automatically Example AT D1 111 123 0009R ENTER Wake up...

Page 70: ...1 comma is 2 seconds You can accumulate the duration by using multiple commas Return the Modem to command mode Add the semicolon at the end of the command line when transmitting information to a telep...

Page 71: ...mand Use this command to return to the on line state after executing the local command Z z Reset command This command clears the DCM 212 s command buffer and resets all commands and registers to the d...

Page 72: ...I or reset command Z is entered H h Hook switch control Controls the hook switch of a telephone The HO setting is compara ble to the condition of the handset resting on the hook while the telephone li...

Page 73: ...ring 52 Escape code definition 52 stores the ASCII value of the escape code character The default value is set to 43 To change the escape function key change the value using the Sx n syntax The value...

Page 74: ...ier tone wait time definition The carrier tone wait time is defined as how long the Modem can wait for a carrier tone transmitted from the remote modem The value of 57 determines this wait time If the...

Page 75: ...he telephone line If you set the value to 255 the Modem assumes the carrier is always present and ignores carrier detect It is defaulted to 7 0 7 seconds To change input the desired number in the rang...

Page 76: ...ed from the computer are echoed to the screen Before executing a self test be sure to disconnect the wall jack phone line cord from the wall jack To set the Modem for self test in originate mode type...

Page 77: ...es ERROR result code 7 Undefined S14 Table 15 Bit mapped Register S14 Bit Condition Function Auto answer disabled 1 Auto answer enabled 1 2 1 1 Local echo disabled Local echo enabled Result codes enab...

Page 78: ...ence S15 Tabic 16 Bit mapped Register S15 Bit Condition Function 300 bps rate 1 1200 bps rate 1 Undefined 2 Answer mode 1 Originate mode 3 Half duplex 1 Full duplex 4 5 Undefined 6 Carrier OFF 1 Carri...

Page 79: ...ure below To accomplish this monitoring mode the Modem s carrier transmitter should be turned off and loss of carrier condition should be ignored For originate mode input AT CO S10 255 D ENTER j For a...

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Page 81: ...he line total all the ringer equivalence numbers If they total more than 5 your phone may not ring In rural areas a total of 3 may impair ringer operation To be sure check with your local telephone co...

Page 82: ...party line phones If you plan to use the DCM 212 in automatic mode only you do not need to use a telephone If your telephone is wired directly to the wall the jacks and adapters necessary for the con...

Page 83: ...uses the RS 232C standard serial interface ca ble to connect to your computer The table below provides the cable requirement for Tandy computers If more detailed information is need ed refer to your...

Page 84: ...tware to be used Select either pair from the following table Table 19 Color Computer Software and Cables Communication Software Cable Catalog No VIDEOTEX 26 2222 Deluxe RS 232 Program Pak 26 2226 26 3...

Page 85: ...ble Channel A or B by typing enab 1 e t tyO 1 ENTER Enable Channel A or enabl e tty02 ENTER Enable Channel B The serial channel that is used must be disabled before using the cu command for making a c...

Page 86: ...e number is the number you want dialed and the s value is the baud rate selected To dial the call out on Channel B type cu phone number s 1200 a dev cua1 i dev cul1 ENTER When the prompt connected app...

Page 87: ...modified internally the local network will start flashing the BUSY indicator on the multi line telephone when the Modem seizes the line RS 232C protocol extension There are 2 RS 232C lines that can be...

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Page 89: ...es in its connec tion the phone company will notify you in writing so you can take the necessary steps to ensure uninterrupted service Maintenance The only maintenance your DCM 212 requires is a perio...

Page 90: ...your telephone circuits Any keys that you press on your keyboard after send ing the Q command or S16 l in Hayes protocol mode are echoed to your display This test causes the data sent from your compu...

Page 91: ...tocol Hayes protocol Full or half duplex all speeds Automatic answer originate Manual answer originate 300 bps 1200 bps Serial binary asynchronous Data bit 7 with 1 or 2 stop bits odd even or fixed pa...

Page 92: ...rminal Ready DTR Ring Indicator RI Output Output Option Input Output Option Electrical General Transmit Level Loop Current at 40 mA Transmit Frequency High Speed Originate Answer Low Speed Originate m...

Page 93: ...Tandy 100 mS Hayes 70 mS Tandy 100 mS Hayes 70 mS Physical environmental Power Requirement Operation Temperature Dimension H x Wx D Net Weight Humidity Operating environment Storage 120 volts AC 60 H...

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Page 95: ...1 it It 3 O o Z a o a i s a JO 3 a 1 s a 1 b o o 2 Z o o 1 E 3 B Ct r H Z o 7 o O z i o o 1 3 1 I z o Z O s i 5 T 1 Z o z 2 11 z o I u 1 ft Schematic subject to change without notice For most accurat...

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Page 97: ...Carriage return 29 30 59 code definition in Hayes protocol 67 See also registers changing the value Carrier tone 18 24 68 69 Carrier tone wait time 68 Clear memory command 56 Command buffer clearing o...

Page 98: ...Line feed code 67 Line status conditions 22 23 busy signal 22 messages of 22 23 no sound 22 re order tone 23 ring back 22 Logging on 15 37 38 Loss of carrier 24 55 Loss of data terminal ready 25 Low...

Page 99: ...ialing speeds RS 232C cables for connecting the modem to a computer 78 RS 232C protocol extension 81 RS 232C standard DB 25 jack 4 78 Schematic 89 Self test mode 24 49 70 84 programming in Tandy proto...

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