The VS1 (pn 7928) was replaced by the COM300 series. It enabled anyone to call a datalogger via phone to receive a verbal report of real-time site conditions. The datalogger could be programmed to report specific conditions or to allow a caller to select specific information by pressing numbers on a touch-tone phone.
*The CR10 must contain a special PROM, Library Special PROM LS5954, that supports VS1 communication. CSI recommends configuring the CR10 with 4k of memory.