DVMS Configuration The DVMS configuration is specifically designed to operate in conjunction with the Ramsey Digital Voice Message System (DVMS) message recorder/player. You may use this for other purposes but it’s primary purpose is for control of the DVMS. The table below defines the signals you can expect on J2. Note that only 1 to 8 and the “#” and “*” DTMF tones are valid for control purposes. DVMS Configuration Outputs 4 to 16 Line Decoder Output The 4 to 16 line decoder output signals are located on output connector J1. These signals are active at all times and are independent of the DCI2 configu- ration.
A single line corresponding to the valid DTMF tone is driven low while the tone is detected. If no valid tone is present all lines are at a logic high. All lines are open collector logic levels and with a logic 0 being at ground level and a 1 being an open. A pull-up is required on all outputs. Note that these are logic levels and can drive simple low current loads such as an LED. Higher current loads require use of a higher current driver. We have provided some suggested driver circuits in the “Wiring And Custom Applications Sug- gestions” section of this manual.
DCI2 26 DTMF TONE FUNC- TION J2 Pin 9 (DVMS DB25-25) J2 Pin 7 (DVMS DB25-13) J2 Pin 5 (DVMS DB25-10) J2 Pin 3 (DVMS DB25-11) J2 Pin 1 (DVMS DB25-12) 1 Msg 1 1 1 0 0 0 2 Msg 2 1 1 0 0 1 3 Msg 3 1 1 0 1 0 4 Msg 4 1 1 0 1 1 5 Msg 5 1 1 1 0 0 6 Msg 6 1 1 1 0 1 7 Msg 7 1 1 1 1 0 8 Msg 8 1 1 1 1 1 # Play 1 0 (pulse) Msg # Msg # Msg # * Stop 0 (pulse) 1 n/a n/a n/a