8
INTERFACING GATEWAY TO DEVICES
4.2 NFB-301C/399C boiler Connections to
Gateway
There are two ways to power the gateway. One method is to
use the boiler PCB (printer circuit board). The other is to use the
included power supply in the box.
Gateway 6 Pin Phoenix connector:
●
The 6 pin Phoenix connector is the same for Gateway.
●
Pins 1 through 3 are for RS-485 devices.
-
Use standard grounding principles for RS-485 GND.
●
Pins 4 through 6 are for power.
Do not connect power until
1 2
O
N
ON
1
2
+
A
B
G
3-Pin
Terminal
Block
6-Pin
Phoenix
Connector
1 2
O
N
ON
1
2
+
Tx +
Rx -
GND
+PWR
-PWR
FRAME
GND
Boiler
(front panel)
Gateway Pin
Terminals
Pin Assignment
A
Pin 1
RS-485 +
B
Pin 2
RS-485 -
G
Pin 3
RS-485 GND
Figure 6: RS-485 Connections to Boiler
Boiler Pins Pin # Gateway 6
Pin Terminal
Pin
Assignment
Pin
RS-485+
1
TX+
RS-485
Pin
RS-485-
2
RX-
RS-485
In GND
3
GND
RS-485
GND
Power In
(+)
4
+PWR
V+
Power In
(-)
5
-PWR
V-
Frame
Ground
6
FRAME
GND
FRAME
GND
Figure 7: Pin and Power Connections
4.1 Gateway Connection Ports
Figure 5: Gateway
4. INTERFACING GATEWAY TO DEVICES
