I recently acquired a 545S microphone. It can be wired for hi-Z and lo-Z but cannot find any info pertaining to the 4 pin connector. I am not certain if impedance selection is done via the connector pins or internally.
Your 545S microphone has a four pin MC4F Amphenol connector. Pins 1 and 2 of this connector are the high impedance output. Pin 2 is the hot in this case.
Pins 3 and 4 are the low impedance balanced output. Pin 4 is the hot. Pin 1 is the ground or shield in either case. The mating connector to the MC4F is Amphenol's part MC4M.