1-Route this schematic in a board with dimension 5cmx5cm or less. Using Altium. Preferably all components on one side.
-2Input voltage is 24VDC which provide the power/ttl for the chips.
3-A separate 7.5VDC out is provide on a two position standard header (+/-)
4-Serial signals of this schematic should be connected to a RS232 DB9 connector (adding the rs232 chip).
5-Reset input will be connected to the RS232 RTS signal. Signal levels will be planned for properly.
6- I would the DC-DC components to be as cheap as possible (less than $2/board).
7-Please prepare to quote me separately assembly of five of these boards.
8-Attached is the sample circuit (Page 15) as well as the entire data sheet oerf the Interbus Master chip.