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7. Remove jumpers TST0 and TST1. Use the Speed and ARINC 429 bits switch to toggle ARINC
429 output bits 9, 10 and 27 to 31, see table on the board for switch positions. Check the
corresponding bit changes on the ARINC 429 output.
Sensor Input and Output Testing
1. Remove jumpers TST0 and TST1. Leave the TXENB link off. Set up the board in default
state, the sensors are in GND/Open state and inputs to switched to GND (ON). Now
change all the Sensor input switches to 'OFF', the output waveform should show the all '1s'
pattern, shown earlier in this document. Switch Sensor input 0 to 'ON' (GND). The ARINC
429 output should change to the one below, with the changed sensor output state
transmitted on as a '1' on bit 11.
2. Set all the sensor input switches to 'ON' (GND), all the ARINC 429 data outputs (bits 11:26)
should change to a '1'. This can also be checked on the connectors SENSOR OUT 0:7 and
8:15.
AN‐8470, Rev. A
HOLT INTEGRATED CIRCUITS
10
3/2/15
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