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This is accomplished by setting the selector switch on the transmitter to either 1, 2, 3, 4, 5, 6, 7, 8 or 9 and setting the #7 and #8 coding switches in the 831 receiver. Start coding by exactly matching all 8 code switches in the transmitter and receivers. The code switches may be set in any random pattern of +, 0 and - positions. Next, in receiver 1, set code switch #7 to + and code switch #8 +; In receiver 2, set code switch #7 to + and code switch #8 to 0. Continue setting the codes in the