The Mega Modem I received has a functional quality issue. The power barrel jack is offset from the hole in the enclosure by ~4mm. I cannot plug the barrel jack into the module because it interferes with the case.
I loosened the screws holding the board on the base of the enclosure to plug in the barrel jack and the modem still will not power up. The modem will not communicate with the thermocouple module I purchased even when using the simplest Node Red example and power through the USB. Not so happy with the quality control. I was trying to use the NCD three channel thermocouple sensor and Mega Modem for a time sensitive project. Unfortunately, I will need to quickly figure out a different solution and return these items.