No, it is necessary to ensure that each MAX31855 is independently measuring the corresponding channel's thermocouple, with each thermocouple being independent. The T- cannot be connected. During the conversion time, tCONV, three functions are performed: the temperature conversion of the internal cold-junction temperature, the temperature conversion of the external thermocouple, and the detection of thermocouple faults. These cannot be synchronized between all the chips, and can lead to errors in temperature conversion and fault detection.