Digital Input Expansion Module (12 CH) – 12DI-EXP-N2K
Across Ocean Systems Ltd.
Rev 1
12DI-EXP-N2K
13 of 22
Table 4: Digital Input Bank #3 Connector
❸
Digital Input Bank #3 Connector
Pin
#
Pin
Designator
Pin Type
Function
1
D9
Input
Digital input #9
2
D10
Input
Digital input #10
3
D11
Input
Digital input #11
4
D12
Input
Digital input #12
5
S3*
Reference
External Reference for D9 to D12
*normally connected to GND
6.1.4
NMEA 2000 M12 Connector
The NMEA 2000 M12 Connector is used to directly connect to standard NMEA 2000 networks
based on circular connector cabling standards. The connector has the following pin-out.
Table 5: NMEA 2000 M12 Connector
❹
NMEA 2000 M12 Connector
Pin
#
Pin
Designator
Pin Type
Function
1
SHIELD
Power
NMEA 2000 Shield Pin
2
NET-S
Power
NMEA 2000 Power Supply Positive
3
NET-C
Power
NMEA 2000 Power Supply Ground
4
NET-H
Comms
NMEA 2000 CAN High Signal
5
NET-L
Comms
NMEA 2000 CAN Low Signal
6.2
C
ONNECTING THE DIGITAL INPUTS
The digital inputs can be configured to be triggered either by connecting the input to positive
voltage, referred to as “Active High”, or by connecting to ground, referred to as “Active Low”.
The digital inputs on Vitals are configured from the factory as “Active High” and it will trigger
by positive DC voltage between 5 VDC and 30 VDC. This is the most common use as majority
of the switches on the boat interrupt the battery power to the load.
The reference can be set using terminals
S1
,
S2,
and
S3
. Terminal
S1
controls the reference
for
D1
-
D4
,
S2
controls the reference for
D5
-
D8,
and
S3
controls the reference for
D9-D12
. If
set to VDC (HIGH), digital inputs need to short to GND (LOW). If set to GND (LOW), then
switches need to go to VDC (HIGH).