This read-write true/false flag selects whether this particular RF Receiver is the one actively acquiring ComPort devices, with the description warning that the ComController must ensure only one RX card per receiver group has this enabled. An admin uses it to control failover: only the designated primary RX card in a group should be set to true so ComPorts are acquired through a single, well-defined path. For example, when swapping the active RX card in a redundant pair, the admin sets hcxAcquisitionEnable to false on the old card before enabling it on the replacement.