CM442 header hardware is a sensor input with two channels. Most of the instruments purchased by customers are single-channel CM442-AAM1A2F010A AK(CM442-3PQ7/0). As a result, on-site personnel often receive the second channel, resulting in no data in the header.
the correct wiring should connect the line in the right row of the figure below to the line in the red line.
Of course, if you buy a dual-channel, CM442-AAM2 * transmitter, you can connect it.