Datatrac 400 Operations Manual - Aeroflex

Aeroflex Operation Manual- - - - - - - - - - - - RCV CHANNEL 1 (ALL) - - - - - - - - - - - 12.5Lbl SDI 29 - - Binary Data - - 11 SSM Par ms270 10 1001110101001001100 11 1 0350302 10 1010010010101001100 11 1 0035320 10 1000101010101010000 11 1 0035- - - - - - - - - - - RCV CHANNEL 2 (SEL) - - - - - - - - - - - - 100Lbl SDI 29 – Hex Data - - 11 SSM Par Tmin. . .no data present . . .HOLD - - - - - - - - RCV CHANNEL 4 (ALL) - - - - - - - - - - - - - - 100Lbl SDI 11 - - Hex Data - - 29 SSM Par Tmax040 01 78889 11 1 *0050041 01 45CBB 11 *0 0050350 01 6ABCD 11 1 ( )In the example above, channel 4 is the active window. Any keystrokes affect only this window. TheHOLD utility is currently active, as indicated in the header. This is described in the next section.Channels 2 and 4 above have in the format header Tmin and Tmax.This appears when the operator selects MIN (in channel 2) and MAX (in channel 4) under Interval inthe Receiver Default menu. In the case of channel 2.,the DATATRAC 400 will latch the minimumreceive interval for each label and display them. In channel 4, the maximum interval is latched anddisplayed. When the instantaneous rate is being displayed, the format header will simply display “ms”(see channel 1).The bus inactivity marker (*) is visible next to the rate of channel 4's label 040. If the bus monitor wasset to 4 for this channel, the asterisk indicates that at least 200 ms have elapsed since the last receiptof label 040-01. See the next section for relevant keystrokes that affect this interval display.If only one data word for a label is received and the unit is unable to compute an interval, an infinity( ) sign is displayed in the rate field (see label 350 in the example).Another feature illustrated in this example is the parity error flag. Label 041 indicates an even parityon the last receipt. This is highlights by the adjacent asterisk. In a typical application, a parity errormight occur once in a stream of data for a particular label. When is does, the unit will display theasterisk for about three seconds, even though the parity returns to “odd”. The “0” alone would flashtoo quickly for the operator to detect that an error has occurred. In this way, the operator can catchparity errors that would otherwise go unnoticed.DATATRAC 400 – REV 0 – PAGE 3-23