San telequip presents smart rs-232 port isolator for 3 kv each galvanic and opto isolations. The company supplies the smart rs-232 port isolators under the name smi. The smi smart rs-232 port isolators are applicable for isolating rx, tx, gnd, rts, cts, dsr and dtr signals. The isolators are also useful for protecting the serial ports of the plc, laptop from damage. The smart rs-232 port isolators are available with technical features like din rail mountable and powered by 90 to 270v ac.