Humidity Control Commands - Aprilaire 8800 Programmer's Manual

HUMIDITy CONTROl COMMANDS

SHUM
Controlling humidification setpoint
Permissions: Read/Write
Query Syntax:
Command
Description: Requests the controlling humidification setpoint .
Assignment Syntax:
Command
Description: Sets the controlling humidification setpoint to [value] .
Example:
Response or Syntax:
COS Message
Example:
Parameters
value: humidistat setpoint in %RH
The controlling humidification setpoint corresponds to the active setpoint to which the humidistat is controlling the humidification equipment .
Assignment commands are ignored if the controller type is set to thermostat .
When the humidistat system mode is set to AUTO, the controlling mode is determined by the humidistat . In addition, when the humidistat
system mode is set to AUTO, the Humidification and Dehumidification setpoints are interdependent and must abide by the fixed deadband . If
an assignment command is received with a setpoint value that causes a deadband violation, the opposite setpoint is automatically increased
or decreased to fulfill the deadband requirement . If the deadband requirement cannot be fulfilled by increasing or decreasing the opposite
setpoint, the command is ignored and no response sent .
Integer values must be within the range specified . The humidification setpoint can be changed through the Home Screens for humidistat
control . If the humidification setpoint is changed at the thermostat, a C5 COS unsolicited message is issued (if C5 is ON) .
SHUM++, SHUM--
Increment or decrement the controlling humidistat humidification setpoint
Permissions: Write only
Assignment Syntax:
Command
Syntax:
Description: Increments or decrements the controlling humidification setpoint to [value] based on the ++/-- .
Examples:
Response Syntax:
Syntax:
Example:
Parameters
value: controlling humidification setpoint increment or decrement value
The controlling humidification setpoint corresponds to the active setpoint to which the humidistat is controlling the humidification equipment .
This command is ignored if the controller type is set to thermostat .
If the resultant setpoint is outside the allowable range for the humidification setpoint, the command is ignored .
44
SN[#] SHUM?<CR>
SN[#] SHUM=[value]%<CR>
SN1 SHUM=45%<CR>
SN[#] SHUM=[value]%<CR>
SN1 SHUM=45%<CR>
Node address 1 responds with a controlling humidification setpoint of 45% .
SN[#] SHUM++=[value]%<CR>
SN[#] SHUM--=[value]%<CR>
SN1 SHUM++=3%<CR>
SN1 SHUM--=5%<CR>
SN[#] SHUM++=[value]%<CR>
SN[#] SHUM--=[value]%<CR>
SN1 SHUM++=5%<CR>
Node address 1 responds with incrementing the humidification setpoint by 5% RH .
COS: C5
Range
[10 – 90]
COS: N/A
Range