Mitsubishi Electric AE-200A Service Handbook page 15

[III System restrictions and notes]
(1) When using the M-NET transmission line of the AE-200 and there are 50 or fewer air-conditioning units (apportioned electricity billing
function is not used)
With the AE200, up to 50 air-conditioning units can be monitored and operated from the unit LCD screen or a Web browser.
Also, if the EW-50 is connected instead of the AE-200, monitoring and operation from a Web browser are possible.
・ The AE-50 cannot be used on its own.
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