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MSP430f149 DAC输出接XTR115怎么实现4-20mA电流输出?

Other Parts Discussed in Thread: MSP430F149, XTR115

MSP430f149  DAC输出0-3.3V电压接到XTR115怎么实现4-20mA电流输出,按照上图接法为什么我的输出一直为0?是不是XTR115不应该这么接?