To transmit orders and instructions for using the text text characters usual codes and structure for a decoder and formed of the command signals and instruction

摘要

1526912 Text transmission INTERNATIONAL BUSINESS MACHINES CORP 25 April 1977 [7 June 1976] 17018/77 Heading H4P In the transmission of coded text, control signals for printer control are transmitted, using the ordinary text signals. Overall commands, such as "new job", "instructions to be changed", "end", "send", and sent using ordinary text symbols, are recognized as commands by being preceded by the ordinary coding for line end or carriage return, LE, and "comma", so that the code "LE", precedes all overall commands. More specific instructions within such overall commands, such as: positioning of right, or left margins, or top and bottom of format; selection of remote device to receive transmission; holding of transmission link; are recognized by being preceded by the code "LE" alone. Commands and instructions are terminated by the ordinary coding for page end or form feed "PE", whereafter received data is interpreted as normal text. The above approach allows additional commands over and above those normally available in an EBCDIC (extended bcd interchange code) to be communicated without loss or mutilation.