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microKool Portable Chillers UGH004/0999
3-16 INSTALLATION
MicroKool portable chillers provide SPI compatible support
for RS-485 serial communications with a host machine. You
can use SPI communication to change or monitor the:
● Process temperature setpoint
● High and low temperature deviation alarms
● Process status (run and alarm conditions)
● Machine 1 status
● Machine 2 status
● Actual temperature to process
● Actual temperature from process
To use the SPI communication option, you must connect the
chiller to the host machine and set the communication baud
rate and node address using the setpoint select and adjustment
buttons on the control panel.
Connect the host machine to the chiller.
Plug the male DB9 connector into the serial communica-
tions port on the chiller.
Apply power to the chiller.
Enter the passcode, if necessary.
Hold the Setpoint Select button for 5 seconds. When the
control displays 1 PaS, use the setpoint adjustment but-
tons to enter the passcode.
Enter the node address.
Press the Setpoint Select button to choose
Address. Then press the setpoint ▲ or ▼
arrow until the address you want appears in
the setpoint display. The address may be set
to any number from 32 to 254 (a hexadeci-
mal integer between 20 and FE), as long as
that number has not been assigned to another
machine connected to the same network.
Set the baud rate to 12, 24, 48 or 96.
The chiller must be set to send and receive
data at the same baud rate as the host
machine. Press the setpoint ▲ or ▼ arrow
until the baud rate you want appears in the
setpoint display window.
12 = 1200 bps 48 = 4800 bps
24 = 2400 bps 96 = 9600 bps
The green SPI status light on the control panel should flash
when the unit is communicating. The LED will turn red, indi-
cating an alarm, if SPI communication is not properly set up.
1
2
3
4
ACTIVATING SPI
C
OMMUNICATION
5
NOTE:
To disable SPI, use
the setpoint
▲
or
▼
arrow to
select Address. Press the
▼
arrow until OFF is displayed in
the setpoint window.
See the A
PPENDIX
for additional
SPI programming information.