DEFAULT SETTINGS & MENU ITEM DESCRIPTIONS
HeatNet Control V3
Page 112
MODBUS ADDRESS
1
1
– 247
The MODBUS address is for communicating with Laptop, PC, or
other MODBUS capable device, such as a Building Management
System. It is the 2nd communication port reserved for host control.
BAUD RATE
19200
1200, 2400,
4800, 9600,
19200, 38400
This is the Baud rate for serial communication from the MODBUS
port. Selectable from 1200, 2400, 4800, 9600, 19200, 38400.
DATA FORMAT
8E1
8E1, 8N1,
8N2, 8O1
8 bits -Even Parity -1 stop bit, valid settings: 8E1, 8N1, 8N2, 8O1
SETPOINT TIMER
ON
ON, OFF
If set to ‘ON”, the setpoint timer is enabled and requires a periodic
update of its value to keep from timing out and returning control to
the
H-Net control. If set to “OFF”, MODBUS always has control and on
a loss of MODBUS communications, H-Net does not assume
control.
SETPT TIME
1 Minute
1 - 240 Minutes
This time is used to automatically reset the SETPOINT TIMER
when any Modbus value is written. If it is set to 1 minute, a periodic
write to one of the registers must occur within 1 minute otherwise
the BMS Setpoint will revert back to the System/Local setpoint.
ENABLED
YES
YES, NO
If a flow meter or flow control is to be used, set to YES
GLYCOL MIX
0%
0
– 100 %
Any mix over 10% de-rates the flow by 30% (rule of thumb
method). Example: if the LOWEST FLOW = 50 GPM, HeatNet will
calculate a New Lowest Flow required to be 65 GPM. The
LOWEST FLOW does not need to be changed, but is calculated to
65 GPM and that value is used by HeatNet.
INPUT TYPE
BMS
CH2 (V), CH2 (mA),
BMS,
This setting determines where the flow values are originating. If set
to Volts (2), then a Flow meter is providing a 0-10V signal on J10B
4-20 mA (2). Ensure that S6 switch 2 is UP for 0-10VDC.
If the setting is mA (2), then a Flow meter is providing a 4-2omA
signal on J10B 4-20 mA (2). Ensure that S6 switch 2 is DOWN for
4-20 mA.
If the INPUT TYPE is set to BMS, a Flow Limited or a Boilers
Limited method can be used. With Flow limited a GPM value can
be written to the BMS GPM Modbus register 40019 with a valid
flow. If the Boilers Limited method is to be used, the number of
boilers that the BMS would allow HeatNet to control is written into
Modbus register 40020.
See the Flow Options section for more details.
