Sandel
Avionics
SN3308 Navigation Display
Installation Manual
90106-IM-G(4) Installation Manual W SIG.doc
Appendix-A Page 26
26: Diagnostics
PFI
000000
Port
1
2
3
Break
000
000
Overrun
000
000
Framing
000
000
Parity
000
000
LNAV
000
000
429/568
000
000
000
Purpose
:
Helps diagnose problems with internal systems such as serial
port error counts showing error counts.
RS232/RS422 Data:
PFI:
Counts occurrence of power fail sensing. Should normally
always be 000000.
Serial Ports
Break:
Usually ind/- inputs to SN3308 are wired backwards. If
also associated with framing errors may indicate the wrong
baud rate selected from the sender.
Overrun:
Usually indicates baud rate of sending unit is too high.
Framing:
Caused by a break error or by baud rate of sending unit too low.
(i.e. 1200 baud GPS sending to 9600 baud Sandel)
Parity:
Not
used.
LNAV:
Indicates internal error decoding information from Loran or GPS.
429/568:
ARINC 429 or DME communication errors (as appropriate
selected/wired).
CLR SOFTKEY:
Clears all the error counts
Note:
It is NORMAL for some errors to occur during power up
sequencing, but errors should not accumulate during normal
operation.
