The switchboards of interface AD1202 and AD1203 are intended for unification of the devices that have sequential interface in accordance with specifications RS232 or RS485 into the network with the topology star and connection to the sequential interface port of personal computer.

As well as for increasing the length of the communications line between them through transformation of interface RS232 signals into interface RS485 signals and vice versa and also for the galvanic decoupling between the channels.