It also provided the specifications for physical connectors. The standard specified signal voltages, signal timing, the function of each circuit in the interface, and a protocol for the exchange of information. This data communications was often an exchange of data between a mainframe computer and a remote terminal via an analogue telephone line, and a modem was required at each end of the connection to carry out the necessary signal conversion (digital-to-analogue and vice-versa).Ī standard was needed to ensure reliable communication and to enable equipment produced by different manufacturers to interoperate.
Recommended Standard 232 (RS-232) emerged in the 1960s as a common interface standard for data communications equipment.
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