T
HERMO
C
UBE
PAO
C
HILLER
P
ART
#
52-400-2G-1-PAO
S
OLID
S
TATE
C
OOLING
S
YSTEMS
,
167
M
YERS
C
ORNERS
R
OAD
,
W
APPINGERS
F
ALLS
,
NY
12590
20
T
ELEPHONE
:
(845)
296-1300
F
AX
:
(845)
296-1303
WEB
V
ERSION
M9
Notes:
1)
Each data set is independent and can be run separately
2)
The command byte is always active, so be careful when sending that the three most significant bits
(bits 5-7) are set correctly. Bit 7 is remote operation (1 = remote), bit 6 is ON/OFF (1 = ON = unit
controlling temperature), bit 5 is Data direction (1 = host to controller, e.g. host sends set point to
controller).
3)
The ThermoCube PAO can store 8 bytes of transmission and can only handle up to 3 commands per
second.
4)
The ThermoCube does not echo back commands from the host.
5)
If RS-232 communications does not seem to be functioning, cycle the main power to reset.
RS-232 Communication Examples:
Example
Communications Sequence
1) Send set point of 25°F to chiller
Host sends command byte = E1 (hex)
Host sends LOW data byte = FA (hex)
Host sends HIGH data byte = 00 (hex)
2) Receive chiller set point
Host sends command byte = C1 (hex)
Chiller sends LOW data byte = set point value in hex (LB)
Chiller sends HIGH data byte = set point value in hex (HB)
3) Receive RTD temperature
Host sends command byte = C9
Chiller sends LOW data byte = actual temp in hex (LB)
Chiller sends HIGH data byte = actual temp in hex (HB)
4) Receive the faults table
Host sends command byte = C8
Chiller sends faults data byte = fault data in hex
5) Send Remote Start only
Host sends command byte = E0
6) Send Remote Stop only
Host sends command byte = A0