ZyXEL Elite 2864 User Guide - Page 147

Application Example In the previous example, an answering machine was installed with a ZyXEL modem. If we use ZFAX as our fax receiving application and we don't want it to answer the call unless it is a fax call, the way to set it up would be: 1) Set ZFAX to answer on 2 rings. 2) Set S51.0=1 to enable EDR and report RING twice. The modem will not re- port a normal RING and ZFAX will not answer a call unless an EDR RING is reported. 3) Set S51.4=1 to enable fax CNG tone detection. It is reported as RING. 4) Set S51.2=1 to enable DTMF tone detection. It is reported as RING. If the remote fax machine does not generate the CNG tone, ask a fax caller through your answering machine message to press "*" (or any other DTMF key) if he (she) wants to send a fax. 5) Save the settings in a profile and reset the modem from this profile, for example: AT&W0Z0 V.25bis Command Set V.25bis is a dialing command set standard defined by the ITU-T. It supports both asynchronous and synchronous dialing. People use AT command dialing in most asynchronous cases because it is widely used and supports many more functions than just dialing. However, AT commands only support asynchronous dialing and V.25bis is used in many synchronous dialing situations. Synchronous V.25bis dialing is used in many IBM mainframe and mini-environments where synchronous communications are used. This is supported by the communication software on the computer. The 2864 series modems support both asynchronous and synchronous V.25bis dialing. However, the internal card supports only the asynchronous mode because it is asynchronous only with its built-in asynchronous serial port. The modem supports the bit-oriented HDLC (High-level Data Link Control) synchronous protocol which most synchronous communication links use. Appendix D lists supported V.25bis commands/indications and their formats. Use AT*I1 to enable V.25bis commands. For synchronous applications, the modem is permanently set in normal situations for use with one application. Save the desired settings in the power-on profile and the modem will be initialized to synchronous mode (&M3) with V.25bis command enabled (*I1) when it is turned on. The V.25bis command set is also selectable through the LCD model's LCD panel menu. A special command RST is provided to get the modem back to asynchronous AT command mode from V.25bis mode. You can enter this RST command in either synchronous or asynchronous V.25bis mode. 13-9