Garmin 4000 Wiring to an Optional Alarm, Wiring to a DB-9PC Serial Connector

Wiring to an Optional Alarm

The GPSMAP 4000/5000 series unit can be used with a lamp, a horn, or both, to sound or flash an alert when the unit displays a message. The alarm does not need to be wired for the 4000/5000 unit to function. The alarm circuit pulls low when the alarm sounds. The maximum current is 100 mA, and a relay is needed to limit the current from the unit to 100 mA. A switch can be installed to select between visual and audible alerts.

		Wire
		Color
	Fuse	Red (power)
Garmin	7.5A - 42V
	Power	Black (gnd)
GPSMAP 4000/5000	cable
Series Unit
	NMEA 0183	Yellow (alarm)
	Cable

Wiring to a lamp, a horn, or both.

+Battery - 10-35 VDC

	Horn
Relay	Lamp

100 ma max

coil current

Wiring to a DB-9 PC Serial Connector

The GPSMAP 4000/5000 series unit can be connected to a PC with a serial port by wiring the unit to a DB-9 serial connector.

Garmin

GPSMAP 4000/5000

Series Unit

Power cable

NMEA 0183

Cable

Fuse

7.5A - 42V

> > >

>

+Battery -

Wire	10-35 VDC	DB-9 pin
see table for		numbers
wire colors
Red (power)
Black (pwr gnd)		pin 5: gnd
Black (data GND)
RX / B(-)
RX / A(+)		Pin 3: tX
tX / A(-)		Pin 2: rX
TX / B(+)

Unconnected

> >

DB-9 Serial

PC Connector

16

2 7

38

49

End View

Wiring to a DB-9 Serial PC Connector

12 GPSMAP 4000/5000 Series Installation Instructions