Subnetwork control unit (scu) – NavCom SR-7120 Rev.A User Manual
Page 61
Safari Network User Guide
3-15
Subnetwork Control Unit (SCU)
J1
Signal
name
Functions Cable
wiring
Pin 1
GND
Chassis
Connect to chassis
ground
Black, 20
gauge
Pin 2
Ext Vin
9-36 V DC power in
Red, 20 gauge
Pin 3
Auto On
Disable
See note 1
White/Blue,
CAT 5
Pin 4
GND IO
COM3_SCU_upstream &
COM3_SCU_downstream,
ground
Blue, CAT 5
Pin 5
RS232 In
COM3_SCU_downstream,
connect to TxD on DTE
White/Green,
CAT 5
Pin 6 RS232 Out
COM3_SCU_downstream,
connect to RxD on DTE
Green, CAT 5
Pin 7
CAN L
CAN bus
White/Brown,
CAT 5
Pin 8
CAN H
CAN bus
Brown, CAT 5
Pin 9
RS232 In
COM3_SCU_upstream,
connect to TxD on DTE
White/Orange,
CAT 5
Pin
10
RS232 Out
COM3_SCU_upstream,
connect to RxD on DTE
Orange, CAT 5
Pin
11
Vin RTN
Ground for 9-36 V DC
power
Green, 20
gauge
Pin
12
IGN Main
See Note 1 below
White, 20
gauge
Table 3-6: J1 Connector for SCU
Note 1.
Radio status
Pin 12 high
Pin 12 low
Pin 3 open
Power ON
Power OFF
Pin 3 grounded
Power ON
Power ON
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