Spec Sheet Preview: The Alpha Communications® VVDTMF DTMF to RS232 Decoder Boards are used for a variety of applications. The primary use is for capturing the DTMF tones generated by a telephone entry type master station and sending the proper RS232 data to a PC which is running AlphaEntry™ (or other) Alpha Communications® software. The VVDTMF is powered from the (required) VV100D input board. The VVDTMF boards are designed to easily surface mount right onto the finished wall by using the mounting holes provided for screw&nb …