Plug connector having position assurance device

An electrical connector system comprising:

• a header connector including a header housing holding header contacts, the header housing including a receptacle, the header contacts including mating ends in the receptacle;
• and
• a plug connector received in the receptacle and mated to the header contacts, the plug connector comprising:
• a plug housing having a mating end and a cable end, the mating end configured to be mated with a header connector, the plug housing including a power contact channel between the mating end and the cable end, the plug housing including first and second module channels between the mating end and the cable end;
• a power contact received in the power contact channel, the power contact being terminated to a power cable, the power contact including a mating end configured to be mated to the header connector;
• a data module received in the first module channel, the data module including a data module housing holding signal contacts terminated to ends of signal wires of a data cable, each signal contact including a mating end configured to be mated to the header connector;
• an end node termination module received in the second module channel, the end node termination module including a termination module housing with a pocket, the end node termination module including a signal processing assembly received in the pocket, the signal processing assembly including an end node printed circuit board (PCB) with an end node control circuit, the signal processing assembly including a signal processing component mounted to the end node PCB for processing signals on the end node control circuit, wherein the end node control circuit is electrically connected to the signal contacts of the data module for processing signals on the end node control circuit;
• and
• a position assurance device coupled to the plug housing, the position assurance device interfacing with the data module to assure positioning of the data module in the first module channel and retain the data module in the plug housing, the position assurance device interfacing with the end node termination module to assure positioning of the end node termination module in the second module channel and retain the end node termination module in the plug housing.