SPORTSTER 14,400 APPENDIX E. FAX AND OTHER OPERATIONS FAX OPERATIONS Fax Modem Guidelines Using your fax modem for facsimile operations requires compatible facsimile application software. You can use the following command format to switch between fax mode and data mode. (Use as you would a standard AT command.) AT+FCLASS=n The valid n values are 0 and 1. Use n = 0 (AT+FCLASS=0) to switch the fax modem to data mode. Use n = 1 (AT+FCLASS=1) to switch the fax modem to fax mode. To determine which mode the fax modem is currently in, use the following command. AT+FCLASS? The modem will return a value of 0 to indicate data mode or 1 to indicate fax mode. NOTE: Whenever the fax modem is reset by using the ATZ command, by toggling the DTR signal, or by turning the power off and on, the modem will be set to data mode. A Note to Programmers If you want to know more about the supported fax commands, refer to the standard for the Service Class 1 fax protocol. ANSI/EIA/TIA-578-1990 (EIA-578) Asynchronous Facsimile DCE Control Standard November, 1990 Approved: October 22, 1990 You can obtain a copy of this standard by contacting Global Engineering Documents, at 1-800-854-7179. HIGH SPEED/LOW SPEED PROTOCOL Overview This section explains how an answering Sportster 14,400 modem switches its connection rate to match the rate of a calling modem. It may be of help to those who want to try programming their computers to switch rates to match the Sportster 14,400's connection rate. The material here applies only when the modem is set for variable rates at both the serial port and connection inter faces, &B0 and &N0, respectively. In both Originate and Answer modes, if the connection rate is set to &N0, the Sportster 14,400 negotiates with the remote modem to connect at the highest possible rate. In addition, if the modem is set to Extended or Advanced result codes (X1 or higher) it signals the computer with one of the following result codes or the optional error- control (ARQ) result codes selected with the &An command. CONNECT (300 bps) CONNECT 1200 (1200 bps) CONNECT 2400 (2400 bps) CONNECT 4800 (4800 bps) CONNECT 7200 (7200 bps) CONNECT 9600 (9600 bps) CONNECT 12000 (12,000 bps) CONNECT 14400 (14,400 bps) The modem sends the result code at its previous rate. Then it switches to the new connection rate. If your software doesn't switch rates and you want to program it to do so, use the example on the next page as a guide. It demonstrates the occurrence of the CONNECT codes in the connection sequence, so that recognition of the codes can be used to switch the software. The example uses a sequence of incoming calls, but the codes also apply to Originate mode connections as long as the modem dials out at a rate higher than or equal to the remote modem's rate. The example below assumes the following settings. Software: Initially 19.2K or 38.4K bps, allowing the following range of connection rates: 14.4K/12K/9600/7200/4800/2400/12 00/300 bps Modem: X1 or higher (rate-specific CONNECT codes), &B0 (variable serial port rate), &N0 (variable connection rate) Example ModemSerial Port Action Response Rate 1.Power on. 19,200 2.300-bps call comes in. RING 19,200 CONNECT 19,200 3.Data link is established. 300 Data transfer takes place. 4.Data session is over. NO CARRIER 300 Call is ended; loss of carrier. 5.2400-bps call comes in. RING 300 CONNECT 2400 300 6.Data link is established. 2400 Data transfer takes place. 7.Data session is over. NO CARRIER 2400 Call is ended; loss of carrier. 8.14,4K-bps call comes in. RING 2400 CONNECT 144002400 9.Data link is established. 19,200 Data transfer takes place. 10. Data session is over. NO CARRIER19,200 Call is ended; loss of carrier. Explanation 1.The modem is powered on and is operating at 19.2K bps or higher, so that it is able to connect at 14.4K bps as well as at lower rates. 2.A 300-bps modem calls. The Sportster 14,400 senses the incoming signal and sends the messages RING and CONNECT to the computer. These messages are sent at 19.2K bps, the current serial port rate. 3.Since the Sportster 14,400 responds CONNECT, rather than with a rate indicator, the software switches to 300 bps. The modem automatically shifts to 300 bps to accept the data from the incoming call. 4.The 300-bps data session is terminated; the modem sends the computer the message NO CARRIER at 300 bps. 5.A 2400-bps call comes in. The modem responds RING and CONNECT 2400. These message are sent at the current bit rate of 300 bps. 6.The software, receiving the CONNECT 2400 message, adjusts accordingly to the higher bit rate. The modem also shifts to 2400 bps. 7.The 2400-bps data session is terminated; the modem sends the computer the message NO CARRIER at 2400 bps. 8.A 14,400-bps call comes in. The modem responds RING and CONNECT 14400. These messages are sent to the computer at the current bit rate of 2400 bps. 9.The software, detecting the CONNECT 14400 message, adjusts accordingly to the higher bit rate. The modem also shifts to 14,400 bps. 10. The 14,400-bps data session is terminated; the modem sends the message NO CARRIER at 14,400 bps. Keep in mind that whether or not your computer adjusts to these rate changes, the Sportster 14,400 automatically shifts connection rates if it is set to &N0. VOICE/DATA COMMUNICATIONS When you install the Sportster 14,400, you have the option of plugging your phone into the second modular jack of the modem so it's available for voice calls. You can also use the phone to set up communications with another user whose modem uses the AT command set, such as a USRobotics or USRobotics-com- patible modem. Preparation First call the other user to establish the parity, word length and number of Stop bits the other person's modem ac cepts. Then turn the call over to your modems, as follows. Procedures 1.Without hanging up the phone, have your modem go off hook in Originate mode. Type the following command. ATD NOTE: Be sure the modem is not set to X2 or X4, or it will return the NO DIAL TONE result code and hang up. 2.The other party should have the remote modem go off hook in Answer mode. The following command is used to do this. ATA 3.Now both of you can hang up your respective phones while the two modems establish the data link. They will maintain the link until one of you gives your modem a command to disconnect. Either party's device can be the originate or answer modem; it doesn't matter who made the phone call. But one modem must enter Originate mode and the other then enter Answer mode. You and the other party, therefore, must agree on which command, ATD or ATA, you will each use.