Telocator Alphanumeric Protocol

Telocator Alphanumeric Protocol (TAP) is an industry-standard protocol for sending short messages via a land-line modem to a provider of pager and/or SMS services, for onward transmission to pagers and mobile phones.

[1][2] TAP, initially known as Motorola Page Entry (PET) was adopted in September 1988, by the Personal Communication Industry Association.

TAP defines an industry standard for sending alphanumeric messages to pagers.

Later, Motorola would create a similar device called the AlphaMate.

No echo shall be employed in full duplex mode.