Using half duplex Serial communications

Hello everyone perhaps someone can help me…I am trying to connect a n Xbee and a separate LoRa board together on one serial communication set. the problem I am having is will it work in half duplex mode if I have Tx connected to the RX of both boards and Rx connected to the TX of both boards or does it have to be TX-TX-TX and RX-RX-RX any suggestions would be greatly appreciated …