Garmin GPSMAP 580 Owner's Manual page 88

Appendix
PIN 8 - Black (Ground)
PIN 13 - Red (DC Positive)
PIN 18 - Blue (P1 NEMA Out)
GPSMAP 580/585 Series Pin Assignment
82
PIN 7 - Yellow (Alarm)
PIN 12 - White (P2 NEMA In+)
PIN 16 - Green (P2 NEMA In-)
GPSMAP 580/585 Series Wiring Harness (Differential)
To Transducer
(If applicable)
(RED) +
Power (10 - 36 Vdc)
(BLACK) Ground
(Power and NMEA 0183)
DC Power
(ORANGE) Accessory On
(BLUE) NMEA 0183 Port 1 Tx (Out)
RXD+
(BROWN) NMEA 0183 Port 1 Rx (In)
TXD+
GND
(GREY) NMEA 0183 Port 2 TX+ (Out+)
RXD+
(WHITE) NMEA 0183 Port 2 RX+ (In+)
TXD+
GND
(GREEN) NMEA 0183 Port 2 RX- (In-)
TXD-
(VIOLET) NMEA 0183 Port 2 TX- (Out-)
RXD-
(YELLOW) Alarm Low
GPSMAP 580/585 Owner's Manual
Source
NMEA Device 1
(Single ended)
NMEA Device 2
(Differential)
Alarm Relay
100ma max
coil current