5/15/2002 1000-205-00B
FloScan Instrument Company, Inc.
Tel: (206) 524-6625 Fax: (206) 523-4961
3016 NE Blakeley Street, Seattle, WA 98105 email: service@floscan.com http://www.floscan.com
INSTALLATION / WIRING
******************************
TwinScan 3” Instrument – Tachometer & GPH *
COMBINATION ONLY
*
Gas– NMEA 0183 Input (LCD) ******************************
This unit conforms to NMEA 183, Version 1.5 and 2.0 interface standards, and requires a message that includes “VTG”, “RMC” or
“RMA”. Check your owner’s manual to verify your GPS / LORAN-C includes this information. To insure an easy trouble free
installation, read all instructions before starting.
WIRING
1. Refer to the electrical wiring section of the GPS / LORAN-C Owner’s Manual for the proper procedure to connect your GPS /
LORAN-C to NMEA 183 devices. Use shielded wire between instruments and ground the shield ONLY at the GPS / LORAN-C
(sender end), not at the FloScan instrument end (receiver end). The shield is not to be used as a ground path.
2. Connect the WHITE/ORANGE wire to the NMEA (+) (BNC center terminal) terminal coming from your GPS / LORAN-C
instrument.
3. Connect the GREEN/BLACK wire to the NMEA (-) (BNC shield) terminal coming from your GPS / LORAN-C instrument.
4. Connect the BLUE wire to the WHITE/RED wire from the TwinScan GPH meter and to one terminal of a single pole, single
throw switch. Connect the other terminal to the BLACK wire (system ground).
CALIBRATION
1. See your GPS / LORAN-C owner’s manual and set output for NMEA 0183 version 1.5 or 2.0 at 4800 bits/sec. (standard).
Speed is always sent on the NMEA string as speed over ground in knots no matter what units your GPS / LORAN-C displays.
2. Fuel flow rate calibration is automatically done when the totalizer is calibrated. To calibrate, see the Totalizer calibration
instruction page.
FUEL ECONOMY/SYNCH OPERATION
The blue wire must be connected to an operating TwinScan fuel flow meter to show fuel economy, otherwise the instrument shows
the synchronizer regardless of this switch position.
1. With the MPG/SYNCH switch in the ON position (BLUE wire closed, grounded), your instrument displays the engine
synchronizer. In the OFF (open) position, the instrument shows fuel economy in nautical miles per gallon or liters per nautical mile
and is automatically selected by the TwinScan GPH/LPH instrument. You must have valid NMEA 0183 version 1.5 or 2.0 speed
data to display fuel economy; otherwise you receive an error code:
ERROR CODES
Display Reason Cause
“ OFF” No signal activity present on NMEA 0183 terminals
for four seconds.
GPS / LORAN-C OFF
NMEA OUTPUT not selected
Leads not connected
(+) & (-) leads reversed
“ - - -
-”
Receiving NMEA 0183 Version 1.5 or 2.0 message,
but speed message is invalid.
GPS satellite reception is poor
GPS / LORAN-C in startup mode
“- Lo -”
“ - hi -
”
(MPG mode) Speed valid but flow rate less than
0.25 GPH.
(LPM mode) Speed valid but less than 0.2 KM.
Flow rate too low—engine stopped
Speed too low—boat stopped
“ Err1” Some pulsing signal present but no NMEA 0183
message received in last four seconds.
Leads connected to wrong source
GPS / LORAN-C set to NMEA 0180 or 0182
(+) & (-) leads reversed.
“ Err2” NMEA 0183 message detected, but no “VTG”,
“RMC” or “RMA” sentence found.
GPS / LORAN-C incompatible with NMEA 0183,
version 1.5 or newer
