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SECTION THREE Installing the 490
Connecting the 490 to a
transducer
Table 5: 490-to-transducer connector pin
wiring
Pin number
Connector
1
Speed signal
2
Speed +V
3
Speed ground
4
Thermistor (temperature)
5
Depth low+ (unused on 490-S)
6
Depth low- (unused on 490-S)
7
Thermistor (temperature)
8
Depth high+
9
Depth shields
10
Depth high-
Page 20
Table 4: Cable connection between the 957/958 and 490 (cont.)
957/958 pin number
4
5
6
* Pin 1 on the 957/958 AUX port requires two connections from the cable.
The red wire is not connected on the 957/958 end, and should be insulated and capped.
Figure 10 below shows how to terminate the transducer cable
for connection to the 490. Pay close attention to whether you're
wiring a 490-S or a 490-D. See also the Transducer Connector
Instructions (GM492).
AUX port signal name
NMEA AUX Out (A)
NMEA AUX Out (B)
NMEA AUX In (A)
Figure 10: Wiring of transducer cable
(solder-cup side of connector shown)
490 INSTALLATION MANUAL, Revision B2
Cable wire color
Violet
Orange
Blue
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