National Instruments 784799-01 PXI MIL-STD-1553 Interface Module

Part Number 784799-01 is the identifying part number for the National Instruments LV-222-550-000 PXI MIL-STD-1553 Interface Module. MIL-STD-1553 is a digital, command-response, time-division multiplexing data bus protocol that is used in military aircraft and other military and commercial applications. This protocol also maintains bus activity logs in a sequential record file that can be analyzed by the user later. 

The 784799-01 is a multi-function, single channel interface module that provides a Bus Controller, Remote Terminal and Bus Monitor operation, and user-configurable RT response time. The user-configurable RT response time allows the user to measure the response from the mid-bit zero crossing of the parity bit to the mid-bit zero crossing of the status word sync. This can be set with the help of software and the value is an integer representing the response time in hundreds of ns up to 819  μs. Note that when error checking is used, the minimum response time can get affected by 3.7 μs for MIL-STD-1553A and 7.7 μs for MIL-STD-1553B. The default value for all the modules is 9 μs. Likewise, the monitoring feature provides filtering for terminal addresses, subaddresses, and concurrent monitoring. 

In addition to the basic features, the 784799-01 also provides additional features like concurrent BC and RT simulation, protocol error injection, variable transmit amplitude, and zero crossing distortion. Note that while transmitting variable amplitudes, sometimes, the line drivers are not capable of putting out very low voltages. Furthermore, if a zero crossing is delayed such that the next zero crossing occurs less than 400 ns later, the timing of the subsequent zero crossing also gets distorted. 

The 784799-01 is a 3U size module that comes with 16 TTL-compatible discrete I/O. Likewise, it features software that helps users install and configure the module. Similarly, it supports application development environments (ADEs) like the NI LabVIEW. Note that the module does not need external power supply since it takes power from the host. Also, the modular structure of the module allows addition, removal, and interchanging of the modules easier.