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3.9
Bulkhead Adapters
The Ai1 is designed with a wide variety of bulkhead adapters that allow easy expansion and customization of the Ai1
capabilities, in a simple to install design. The bulkhead adapters all use the M12 sensor connection system. Surge
protection is typically included with the bulkhead adapters, to protect the Ai1 from lightning induced surges on the
incoming lines. The bulkhead adapter includes a convenient earth point to provide the lowest resistance path to
earth to dissipate induced surges.
Pump Power and Direction Control
Provides high power pump control with reverse polarity for directional pumping. M12 connections are available on
two ports for increased current carrying capacity.
Intern (JST) Terminal
Connection External (M12)
Sensor
Protection
1: Red
BAT
X
1: Brown
Pump +
-
2: Black
GND
X
2: White
Pump +
-
3: Yellow
FWD (SE1-6). Typ. A1
X
3: Blue
Pump -
-
4: Green
REV (SE1-6). Typ. A2
X
4: Black
Pump -
-
5: Blue
GND (for higher powered pumps, in parallel to 2: Black)
6: White
BAT (for higher powered pumps, in parallel to 1: Red)
(uses
Analog
main board header, modified for pins 5 & 6)
Power Control Relay
Provides high power control with three terminals (Normally Open, Normally Closed and Common) with switching
current up to 5A. Terminals NO and COM are doubled up for increased current carrying capacity. Uses low current
enable signal (can be driven using analog channels 1-6).
Intern (JST) Terminal
Connection External (M12)
Sensor
Protection
1: Red
SW12 or BAT
X
1: Brown
NO
-
2: Black
GND
X
2: White
NO
-
3: Yellow
Enable (SE1-6). Typ A1
X
3: Blue
COM
-
4: Green
Not used
4: Black
COM
-
5: Blue
Not used
5: Grey
NC
-
(uses
Analog
main board header)
Regulated Power Supply Carrier and 1-Stage Surge Protection
Carries various regulated power supply boards for 3.3V, 5V, 24Vdc. Also may be used for 1-Stage surge protection,
with up to 3 user defined sensor connections.
Intern (JST) Terminal
Connect.
External (M12) Sensor
Protection
1: Red
12V or SW12V
X
1: Brown
Regulated Voltage Out 1-Stage (TVS)
2: Black
GND
→
4: Black
Ground
Earth lug
3: Yellow
User defined
→
2: White
User defined
1-Stage (TVS)
4: Green
User defined
→
5: Grey
User defined
1-Stage (TVS)
5: Blue
Enable Control
→
3: Blue
Enable Control
1-Stage (TVS)
(uses either
Analog
or
Digital
main board header depending on user defined program requirements)
Latching Relay
Provides low power control with three terminals (Normally Open, Normally Closed and Common) with switching
current up to 1A. Terminals NO and COM are doubled up for increased current carrying capacity. Requires 30mA
enable signal when switching (requires Vx1 or Vx2).
Intern (JST) Terminal
Connection External (M12) Sensor
Protection
1: Red
12V
X
1: Brown
NO
-
2: Black
GND
X
2: White
NO
-
3: Yellow
SET (Vx1)
X
3: Blue
COM
-
4: Green
RESET (Vx2)
X
4: Black
COM
-
5: Blue
Not used
X
5: Grey
NC
-
(future version uses
Analog
main board header when transistor circuit added)
Analog Input Expander (SDI12)
Allows the connection of up to 4 analog inputs measured using a single SDI12 bus. Multiple analog input expanders
may be added to the one Ai1 with each using a unique address to identify. Analog measurements are made using
