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5.7.3.5 SELECTING THE BINARY INPUT CURRENT The input threshold for detecting a logic 1 can be set at either 8uA or 20mA using a jumper on the module board. When jumper J4 is shorted, the threshold current level is 20 mA. When jumper J4 is not shorted, the threshold current level is 8μA. A threshold current value of 20mA has a higher resistance to noise on the input but also dissipates more power. Fig. 32: CNT I/O board Jumper J4 31