The 429EBP, with Boeing labels, provides avionics technicians and line maintenance personnel with an easy method for troubleshooting ARINC 429 labels. It has the capability to selectively trap labels three different ways. The 429EBP has a non-volatile memory and features user-selectable ARINC Air Transport Equipment Identifier Codes. Transmitted and received data can be viewed in either hexadecimal or easy-to-understand engineering format. The 429EBP is housed in a rugged, compact case with internal, rechargeable NiCad batteries. The unit comes with either a 110V or 230V plug-in battery charger. An optional carrying case is available for convenience and protection of the unit.In transmitter operation, the 429EBP provides capability for transmitting up to ten 32-bit words in ARINC 429 or 419 bipolar RZ format. The transmit bit rate can be set for high (100 kbps) or low (12.5 kbps) speed with selectable odd or even parity. The unit allows keypad entry of transmit label (octal) with data entry via hexadecimal (bits 32 through 9) or by engineering equivalent values. Entry by engineering values allows individual entry of primary data (miles, knots, MHz, etc.), SDI, SSM, word rate and individual bit switching functions. Non-RF labels have additional screens that allow for slewing data with programmable slew limits and direction of slew in desired increments. The transmitter operation is completely independent of the receiver, allowing simultaneous operation of both the transmitter and receiver. Transmitted labels can be stored in non-volatile memory.In receiver operation, the unit is capable of receiving and trapping (storing) up to 255 high or low speed 32 bit words in 429 or 419 bipolar RZ format. The unit is also capable of trapping 511 occurrences of one label of data only from strings of data containing multiple words. The special trigger trap mode expands receiver capabilities further to allow trapping of block data protocols or of alphanumeric strings of data. The receiver also allows the user to view all individual bits. Receiver bus speed is switch selectable. LCD display of received labels is provided with selection of hexadecimal or engineering formats. Initial receiver screen displays the number of labels that have been received with ability provided for stepping through each label for data display. Trap mode allows operator to select which labels are to be trapped (four possible user selectable label/data combinations). Access to received or stored data is accomplished by single-step scrolling keys or by automatic scrolling mode. Trapped data is stored in non-volatile memory until cleared.