when an end of transmission code or end of word code is detected by gating 60 resettable timer will not be reset fig6 illustrates the content of each data word it will be appreciated that a number such as a stock price a temperature or the like is useless unless some identification is provided indicating exactly what the number represents in the present invention a memory location in the random access memory is devoted to each possible parameter to be displayed the information regarding that parameter is represented by the information stored in that memory location therefore both the address and data for each parameter must be transmitted to the remote display unit by the central processor in order that intelligible information be conveyed the transmission being conducted in serial rather than parallel some indication must also be provided as to the end of the word of data and address code bits 74 are provided as shown in fig6 to indicate receipt of a full word of data address the code bits can also indicate further functions as needed for example if more than a single data address word is to be transmitted in a single transmission from the central processor two different codes can be employed six bits are shown in fig6 in the section 74 indicating code bits this number of code bits would allow 64 different possible codes for whatever 64 functions might be desired i e 2 to the 6th power each code used must be detectable by gating 60 in a simple embodiment a code indicating an end of word and a second code indicating an end of transmission are preferred.