Table 1-40 summarizes the available Models, Options and Accessories. Table 1-40. Models, Options and Accessories Table 1-40. Models, Options and Accessories Digital I O Relay with Totalizer Module Fluke DAQ Software. Included with the purchase of each chassis. Fluke Development Software from InduSoft Fluke DLL Library routines for the development of device drivers Fluke OPC Software. Used to configure a PC to act as an OPC server and provide virtual contact with a 268XA device.