Navien Modbus/BACnet Gateway, Руководство по установке и эксплуатации

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9 INTERFACING GATEwAy TO DEVICES
4.4 Termination Resistor
R1 Termination
Resistor DIP Switch (1)
R2 Termination
Resistor DIP Switch (1)
Figure 8: Termination Resistor DIP Switch
If the gateway is the last device on the serial trunk, then the End-
Of-Line Termination Switch needs to be enabled.
To enable the
Termination Resistor, move the TERM dip switch to the right as
shown in Figure 8.
Termination resistor is also used to reduce noise. It pulls the two
lines of an idle bus together. However, the resistor would override
the effect of any bias resistors if connected.
Note
●
The R1 and R2 DIP Switches apply settings to the
respective serial port.
●
If the gateway is already powered on, DIP switch
settings will not take effect unless the unit is power
cycled.
4.5 Power-Up 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.
Check power requirements in the table below:
Power Requirement for Gateway
Power Requirement
for Gateway
Current Draw Type
Navien Gateway Family 12 VDC 24 V DC/AC
GXXX001932 (Typical) 250 mA 125 mA
Note
These values are ‘nominal’ and a safety margin
should be added to the power supply of the host
system. A safety margin of 25% is recommended.
Figure 9: Required Current Draw for the Gateway
4.5.1 Power Up Using the PCB
Apply power to the Gateway as shown below in Figure 10.
●
The gateway accepts 12-24 VDC or 24 VAC on pins 4 and 5.
●
Frame GND should be connected.
NULT
I SW
FLO
W S
W
LP SW
OUT DOOR
DHW TA
NK
(+)
(-)
(+)
(-)
SY
ST
EM
SU
PPL
Y
SY
ST EM
RE
TU RN
R W
T/S ZONE 1 T/S ZONE 2 T/S ZONE 3
C R W C R W C
R
W
C
T/ S DH
W
3.LWCO
2.AC24VL
1.AC24VN
NULTI SW
R W
T/S ZONE 1 T/S ZONE 2 T/S ZONE 3
C R W C R W C
R
W
C
T/S DHW
3.LWCO
2.AC24VL
1.AC24VN
CNC3
3 -Pin
Connector
+
+L
-N
FRAME
GND
Boiler
Front Panel
PCB
Boiler
(controller)
Gateway Power
Terminal
Pin
Assignment
2. AC24VL +L V+
1. AC24VN -N V-
- FG FRAME GND
Figure 10: PCB Power Connections
4.5.2 Power Up Using the Power Supply
Apply power to the gateway power terminal pins +L and -N as
shown below in Figure 11.
Power to
Gateway
Gateway
Pin Label
Pin
Assignment
SMC Power
Supply
Wires
Power In
(+)
+L V+
white/
Black
Power In
(-)
-N V- Black
Frame
Ground
FG
FRAME
GND
NA
Figure 11: External Power Connections