Check the listing for details. National Instruments BNC-2111 Shielded Connector Block / Terminal Box 192596B-01. Condition: Used. Listed at 245.00 USD. National Instruments BNC-2111 shielded connector block, in excellent condition. Designed for single-ended AI, AO, and DIO connections to a large number of NI DAQ devices. The NI BNC-2111 is a shielded connector block with signal-labeled BNC connectors. You can use this connector block with NI X Series, M Series, and E Series multifunction data acquisition (DAQ) devices. The BNC-2111 has 24 BNC connectors for access to 16 single-ended analog input signals, two analog output signals, five digital I/O programmable function input (PFI) signals, and the external reference voltage for analog output signals. It includes a single two-position switch for selecting between floating-source and ground-referenced analog input signals. For additional information and resources, use the model name to search the manufacturer's website.