DCI2 FUNCTIONALITY DESCRIPTION The DCI2 is configurable by the user to operate as either a FULL DTMF 16 tone decoder or an interface to the DVMS. Both configurations have security capability. In DVMS mode only 8 messages are available. In FULL DTMF mode 4 binary coded lines are provided along with a data valid line. In this mode the data lines may be configured to either remain latched or to activate and return to a high state when a valid DTMF tone is detected. A data valid signal is also provided to indicate when valid data is present. All data lines are active low and the data valid is a low going pulse which occurs when the data is set on the lines.
In DVMS Mode three lines are provided with a binary code along with mes- sage play and stop control lines. Latching of any data is prevented in this mode. Full DTMF continuous decoding is also provided in either DVMS or FULL DTMF mode. A 1 of 16 line output (active low) and a data valid line (active high) is provided independent of the DCI2 configuration. The lines activate only during presence of a tone. Otherwise they are at a high state for the data and low for the data valid line. This is done entirely in hardware. No software code is involved. In secure configuration modes a 1 minute window is provided after the last activity at which point security will expire.
Security also expires upon entry of a "*" in any mode except programming. Configuration is accomplished by activating the PROG switch on initial power up, entering the configuration desired, releasing the PROG switch and cycling the power. Note that ALL positions MUST be entered in the proper sequence during programming. Default configuration for a virgin programmed processor is full binary, latched, no security. A more detailed description of the data lines is provided later in this manual Configuring Your DCI2 The DCI2 is configured at the factory to operate as a full DTMF decoder in a non-secure mode.
This makes it easier for you to troubleshoot immediately after you have completed assembly. Of course being the excellent kit builder you are there should be no problems but just in case we made it easy to trou- ble shoot. Simply follow the steps below and you should have no problems. DCI2 21