J.P. Instruments EDM 700/800/711 Pilots Guide - Manual (Page 51)

For Your Safe Flight Page 47
Diagnostic Messages, Fuel Flow
The following displays indicate a malfunction in the Fuel Flow Option
transducer or associated electrical connections:
0.0 GPH Zero’s indicate Fuel flow is too low to register
--- GPH Dashes indicate No fuel flow transducer signals
--- H.M Dashes indicate No fuel flow transducer signals
GPS Interface Diagnostics
Parameters REQ, RES, &MPG are all
missing from the scan.
No communications from GPS receiver
to EDM. Possibly no connection or
aircraft GPS is off.
NO-COM message and parameters
REQ, RES, &MPG are missing. Communications are received by EDM
and the Auto-Protocol setup is in
process. Verify correct output format
setup in GPS receiver; check GPS
connections.
NO-SIG message and parameters
REQ, RES, &MPG are missing. GPS receiver has insufficient signal for
valid data.
NO-WPT message and parameters
REQ& RES, are missing. No waypoints are programmed into the
aircraft GPS receiver.
---REQ or ---RES message Your ground track is more than
70°
from your course to the next GPS
waypoint.
Navigation Data Ports for GPS Comm
(These ports are completely independent of the EDM serial data output
port.)
Navigation Data (output of GPS; input to EDM)
Compatible with RS-232, TTL, RS-423, RS-422 SDA.
Serial data format: 8 data, 1 start, no parity. Baud rates: 1,200,
4,800, or 9,600 depending on the GPS data output format. The EDM
automatically detects the GPS data output format and is independent
of the GPS-C setting.