Kodiak
Recirculating Chiller Technical Manual
Manual# 820-0043 Rev N, 11/25/2019
43
1.6 Commands
1.6.1 The following host Control messages are defined:
1.6.2 Read Chiller Status
This command (‘R’) will cause the Chiller Control to return a complete status string with the
following form:
^JR ControlFlags AlarmFlags PlantTemp SetTemp Pressure ^M
Where:
ControlFlags Status in Bit encoded Byte (2 chars).
Bit 7 (MSB) Machine On
; lights the temperature display and pressure indicator bar
Bit6
ExpansionRelay2On
; not used by host program
Bit5
ExpansionRelay1On
; not used by host program
Bit4
HeaterOn
; not used by host program
Bit3
AutoFillOn
; not used by host program
Bit2
CondenserRelayOn
; not used by host program
Bit1
CoolValveOn
; light the Cool Status
Bit0 (LSB)
CelsiusDisplayOn
; determines the display in Low resolution
AlarmFlags Status in Bit encoded Byte (2 chars). Assignments are:
Bit7 (MSB) Over Temp
;Over Temperature Alarm is lit
Bit6
LoTemp
;Low Temperature Alarm is lit
Bit5
Low Flow
;LoFlow Alarm is lit
Bit4
Low level
;LoLevel Alarm is lit
Bit3 NotUsed
;not
used
Bit2 NotUsed
;not
used
Bit1
AudibleAlarmOn
;Alarm transistor (Al toggle)
Bit0 (LSB)
SummaryAlarmOn
;beeps computer
PlantTemp and SetTemp encoded ( 2-byte hex
(
Cx100
))
Pressure encoded is integer value (hex 1-byte)
1.6.3 Read Plant Temperature
This command (‘T’) will cause the Chiller Control to return the plant temperature in a status string
with the following form:
^JT PlantTemp^M
Where: PlantTemp Plant Temperature Value (2-byte hex
(
Cx100
))
^J ^M Ascii Linefeed and Carriage Return
