A slight guess, based on the number 5 at the end of the model number, where the first ones like that I encountered (DS-2CD3335-I, DS-2CD2335-I) were G0 models.You suggested G0, but I like to understand why.
But with some uncertainty due to the 5 as the second last digit, which suggests a 5MP sensor, and the FWD suffix which is a more recent designation.
But looking more closely, the DS-2CD2355FWD is more likely to be a G1 series, with firmware here :
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That is a bit odd, almost like the connection/power is fluctuating quickly.Secondly, I am puzzled by the multiple lines in my TFTP log (ie "Start file transmitting..." msg x6 and the "Connection success.." msg x 6), when all the doco ive seen shows these lines appearing ONCE. Any idea what might be causing this?
Both PC and camera wired, camera powered by 12V? That's the best combination.