Micom adopted an anti-takeover measure.

Shareholders of the Simi Valley-based company, which makes computer communications equipment, approved a so-called fair-price rule. It is designed to prevent a suitor from buying shares at one price to gain control of the company and then acquiring the remaining shares for less. Micom executives said they needed the protection because of the sharp drop in the company’s stock--to slightly more than $10 recently from nearly $50 a share in 1983.