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C <br />. 0 • ■ 0 <br />0 <br />The distribution board accepts current loop signals from a <br />controlling device (console) through P 102. These signals <br />are isolated by opto-coupled isolators. The distribution <br />board converts these signals into control voltages for <br />driving the dispensing unit current loops. <br />The data from the dispenser current loops is converted to <br />a control voltage, which in turn controls the current <br />isolators. <br />Three status indicators (LEDs) are provided: <br />"REVERSE LOOP" Lights if the input current loop from <br />the controller are connected with <br />reversed polarities. <br />"TX" Lights if current is flowing through <br />the input loop. This LED will blink <br />rapidly when data is present. <br />"RX" Blinks rapidly when dispenser data is <br />being received. <br />The RS422 Interface converts the 5 volt signals (used by <br />G -SITE controllers) to the 45ma required by the opto- <br />coupled isolators. <br />The three status LEDs; "REVERSE LOOP", "TX", and "RX" <br />operate in the same manner as with the TWI interface. <br />Page 8 MDE-2714A • Universa! Distribution Box Service Manual • 02196 <br />