ISO 1745:1975 Information processing – Basic mode control procedures for data communication systems is an early

ISO standard The International Organization for Standardization (ISO ) is an international standard development organization composed of representatives from the national standards organizations of member countries. Membership requirements are given in Ar ...

defining a

Telex The telex network is a station-to-station switched network of teleprinters similar to a telephone network, using telegraph-grade connecting circuits for two-way text-based messages. Telex was a major method of sending written messages electroni ...

-oriented communications protocol that used the non-printable

ASCII ASCII ( ), abbreviated from American Standard Code for Information Interchange, is a character encoding standard for electronic communication. ASCII codes represent text in computers, telecommunications equipment, and other devices. Because ...

transmission control characters SOH (Start of Heading), STX (Start of Text), ETX (End of Text), EOT (End of Transmission), ENQ (Enquiry), ACK (Acknowledge), DLE (Data Link Escape), NAK (Negative Acknowledge), SYN (Synchronous Idle), and ETB (End of Transmission Block). It also defines a serial data format, consisting of a start bit, 7 bit ASCII ( least significant bit first), a parity bit (even for asynchronous networks, odd for synchronous networks), and a stop bit. The text of ISO 1745:1975 is not currently freely available, but the corresponding ECMA version is. The protocol it defines seems to now be little used.

References

#16 #01745 {{Measurement-stub