These are all cards that mount in a PC to allow that pc using software such as RSlinx or Cimquest Ingear to communicate across DH+ networks.
-KTX card is for older PCs with an ISA slot. Requires hardware settings to configure
-Pktx for newer Pcs using PCI slots and plug and play configuration. Has only 1 channel for DH+ or RIO
-Pktx(d) same as Pktx except has two channels for DH+ or RIO. (d) means dual channels