VXIbus--A Modular Standard for Test & Measurement

Module Identification Lines

The MODID lines allow a logical device module to be identified with a particular physical location or slot. Using the MODID lines the resource manager can detect the presence of a module in a slot, even if it is not operational. It can also identify the slot occupied by a specific module. Each module connects an 825 ohms resistor between its MODID pin and ground. By sensing the resistance, the Resource Manager can determine whether or not a module is installed in each of the 12 slots. Other information such as manufacturer, model number and last date of calibration can be obtained via the resource manager's control of the configuration registers.