SHM-B Async Modem Summary In all cases the SHM are connected directly between a computer (DTE) and a GPS receiver (DCE). It requires a 115V AC power supply and is used with the following receivers: Trimble 4000SSE/SSi Ashtech Z-XII AOA TurboRogue... Read More

SHM-NPR/RJ Modem Summary In all cases the SHM are connected directly between a computer (DTE) and a GPS receiver (DCE). SHM-NPR/RJ uses the power available from the RS-232 connector on the Data Terminal Equipment (DTE) (also called Data... Read More

Short-haul Modem Summary If phone service is not available, Short-Haul Modems (SHM) can be very useful for extending RS-232 distances from the limit of the 50 foot RS-232 cable up to 4 miles. (Please see manufacturer specifications for connections... Read More