[CA] [CA11] Sounder modules

[Chuck - Raymarine - Moderator]

egavasm,

Q. Prior to connecting the DSM300 to the new transducer I looked to see the choices of transducers that the DSM300 showed as transducer choices and it did not show the B164 however when I plugged the B164 into the DSM and then powered it on, it immediately gave me that as well as other 1000 watt transducers as compatible choices to pick. Would that mean that the DSM300 was recognizing that it was connecting to a 1000 watt transducer?
A. Yes. Essentially, the DSM300 will make a determination about whether a 600W or 1kW 50kHz/200kHz transducer has been interfaced to the DSM based upon the sensed resistance. In a nutshell, 1kW and 2kW 50kHz/200kHz transducers which have been designed for use with Raymarine fishfinding products feature a sense line which presents a 3kOhm resistance to the fishfinding product. Should the Raymarine fishfinding product not detect 3kOhm resistance on the transducer's sense lead, then the Raymarine fishfinding product will assume that the transducer is a 600W transducer. The MFD will corresponding provide 600W or 1kW/2kW transducer lists to choose from based upon the sensed resistance.