I just found an article in Elektor describing the use of an encoder chip with 4 data in lines with 7 transmitter ID's.
they used three of the data lines in a binary code arrangement to identify each transmitter. The 4th data line is set up as a low battery signal. So, D0,D1,D2 all low is 0, D0,D1 low and D2 high is 2 etc.

The receiver side of things uses a BCD to 7 segment LED display to report the transmitter ID. My question comes from the use of a latching setup on the BCD chip. Will it have to be reset manually to change the display or will a new signal from another transmitter change the display?

Thanks guys,
Doug