Data modem COM220

networkfor data collection

The COM220 phone modem enables communications between a computer and a Campbell Scientific datalogger over a public switched telephone network. A Hayes-compatible modem is required at the computer site. The COM220 connects to the datalogger at the field site. Most Campbell Scientific dataloggers are compatible. Benefits and Features - Wide operating temperature range and low power requirements make it ideal for use at remote sites - Supports communication rates up to 115.2 kbps between modem and logger. (In practice, data transmission through phone lines is generally constrained to 33.6 kbps.) - Compatible with most Campbell Scientific data loggers - Offers both modem enabled (ME) and synchronous device communications (SDC) modes. - Allows user to set the number of rings before answering call. The COM220 has a CS I/O port, power terminals, screw terminals, and an RJ-11C jack. The datalogger connects with the CS I/O port via an SC12 or SC12R-6 cable. The RJ-11C jack is for attaching a surge-protected telephone line. Alternatively, the screw terminals (GND, RING, TIP) can be used to connect the COM220 with a phone line via a surge protector.