Appendix b, Spi command pairs, See the – Conair MPA User Manual
Page 77: Ppendix, For additional, Ommands, Upported by the, Onair micro, Spi c
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C
HILLER
SPI C
OMMANDS
A
PPENDIX
B-1
The SPI commands supported by Conair microKool portable
chillers are listed in the following tables.
The standard required commands and three optional com-
mands are listed in the SPI Command Pairs table, along with
the Select and Poll command pairs in hexadecimal format.
Select commands set or change chiller functions. Poll com-
mands retrieve information from the chiller.
See the tables on the following pages for the SPI status words
and BIT positions for Process Status, Machine 1 Status and
Machine 2 status.
For more information on the SPI protocol, you can obtain the
SPI Communication Protocol Manual by contacting:
The Society of the Plastics Industry, Inc.
1801 K Street, NW, Suite 600K
Washington, D.C. 20006
(202) 974-5200
Fax: (202) 296-7005
www.plasticsindustry.org
SPI C
OMMANDS
S
UPPORTED BY
THE
C
ONAIR
MICRO
K
OOL
SPI Command Pairs
Portable chillers Device ID: hex 21
Commands
Select
Poll
Echo
0x21
0x21
- Select stores 4 bytes of information at the chiller; Poll retrieves it.
0x21
0x20
Setpoint Process Temperature
0x21
0x21
- Sets and retrieves the process temperature setpoint.
0x31
0x30
Alarm, High Temperature Deviation*
0x21
0x21
- Sets the alarm band temperature; retrieves setpoint + alarm band value.
0x33
0x32
Alarm, Low Temperature Deviation*
0x21
0x21
- Sets the alarm band temperature; retrieves setpoint + alarm band value.
0x35
0x34
Mode, Machine
0x21
0x21
- Start/stops the chiller; acknowledges alarms; retrieves run status
0x49
0x48
Version
0x21
- Retrieves 4 bytes of SPI version information.
0x22
Process Status
0x21
- Retrieves run status and alarm conditions.
0x40
Status, Machine 1
0x21
- Retrieves run status and alarm conditions.
0x42
Status, Machine 2
0x21
- Retrieves run status and alarm conditions.
0x44
Temperature, from Process
0x21
- Retrieves the actual temperature of fluid returning to the chiller.
0x72
* NOTE: Both High and Low Temperature Deviation commands set the
same variable. Use only one of these commands to avoid problems.