DyNet Interface

This section lists DyNet FCUC messages that are not readily accessible from System Builder using the GUI.

It also lists some other DyNet messages intended for use in typical HVAC situations.

FCUC User Preferences

The DDFCUC allows the user to change plant capability and user preferences during runtime. A logical DyNet message is implemented to set/retrieve the status of plant capabilities.

Message Frame
`0x1C`	Area	USER PREFERENCE	Opcode	DataHi	DataLo	Join	Checksum

Message Frame Details
OPCODE
`0x48`	Set/Reset User Preference
`0x49`	Request User Preference
`0x4A`	Reply/Report User Preference
USER PREFERENCE
`0x06`	Actual Temperature, 16 bit in 0.25 deg Celsius steps
`0x07`	User Temperature setpoint, 16 bit in 0.25 deg Celsius steps
`0x09`	Air Conditioning Plant Capability
`0x0C`	Actual Temperature, 16 bit in 0.01 deg Celsius steps (Range -127.99 to 127.99)
`0x0D`	User Temperature setpoint, 16 bit in 0.01 deg Celsius steps (Range -127.99 to 127.99)
DATAHI	Bit Mask
For user preference `0x09`	b0: 1 - Heating available, 0 - Heating
	b1: 1 - Cooling available, 0 - Cooling not available
	b2 to b7: Unused

Fault states

You can request a fault state from the device over DyNet. This also clears the fault state. A physical DyNet message is implemented to set/retrieve the plant fault status.

Message Frame
`0x5C`	`0x58`	BOX NUMBER	Opcode	Fault Type	FAULT STATUS	FAULT DETAILS	CHECKSUM

Message Frame Details
OPCODE
`0x59`	Request Device Fault State
`0x5A`	Reply/Report Device Fault State
`0x5B`	Set/Reset Device Fault State
FAULT TYPE
`0x00`	Fire Trip
`0x01`	Airflow
`0x02`	Energy Holdoff (i.e. Window switch)
`0x06`	Temperature Sensor faulty
`0x08`	Drip Tray
`0x09`	Dirty Air Filter
FAULT STATUS
`0x00`	Normal
`0x01`	Alarm (fault input is activated)
`0x04`	Acknowledge alarm (force alarm to return to normal)
FAULT DETAILS	0 – Fault not present, 1 – Fault present
For fault type `0x06`	Bit 0: Local sensor open circuit
	Bit 1: Local sensor short circuit
	Bit 2: Remote sensor timeout
	Bit 3-7: not used

Task Port Interface

Task Port Task Sub-port Description

Task Port	Task Sub-port	Description
`0x11`	0	Bit Mask (b0: AUX, b1: Input 1, b2: Input 2, b3: Input 3, b4: Input 4, b5-b7: Unused) When Input 1, Analog = False.
`0x1D`	0	Measured temperature in 0.25°C - Lo byte (Initiate Reading at source)
1	Measured temperature in 0.25°C - Hi byte
`0x1E`	0	Desired temperature in 0.25°C - Lo byte (Initiate Reading at source)
1	Desired temperature in 0.25°C - Hi byte
`0x1F`	0	Measured temperature in 0.01°C - Lo byte provides integer part (Initiate Reading at source)
1	Measured temperature in 0.01°C - Hi byte provides fractional part
`0x20`	0	Desired temperature in 0.01°C - Lo byte provides integer part (Initiate Reading at source)
1	Desired temperature in 0.01°C - Hi byte provides fractional part

0x11

Bit Mask (b0: AUX, b1: Input 1, b2: Input 2, b3: Input 3, b4: Input 4, b5-b7: Unused)
When Input 1, Analog = False.

0x1D

Measured temperature in 0.25°C - Lo byte (Initiate Reading at source)

Measured temperature in 0.25°C - Hi byte

0x1E

Desired temperature in 0.25°C - Lo byte (Initiate Reading at source)

Desired temperature in 0.25°C - Hi byte

0x1F

Measured temperature in 0.01°C - Lo byte provides integer part (Initiate Reading at source)

Measured temperature in 0.01°C - Hi byte provides fractional part

0x20

Desired temperature in 0.01°C - Lo byte provides integer part (Initiate Reading at source)

Desired temperature in 0.01°C - Hi byte provides fractional part