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
18
T
ELEPHONE
:
(845)
296-1300
F
AX
:
(845)
296-1303
WEB
V
ERSION
M9
7.2
E
NHANCED
RS-232
C
OMMUNICATIONS
(S
TANDARD
)
ThermoCube PAO comes with an Enhanced RS232 communication
port. The chiller uses this port to communicate a comprehensive set of
control parameters with a Host PC - these parameters are outlined
below. This port is a 9-pin female d-sub connector and is found on the
rear panel of the chiller (see Figure 3C and 3D).
-ES: Enhanced RS-232 Communications (Standard, not shown in part number)
Wiring:
Proper wiring depends upon whether the equipment being cooled (the Host) is wired as Data
Computer Equipment (DCE) or Data Terminal Equipment (DTE)
Table 1A: Signal definition and wiring for Host wired as DTE
Computer/Host/Master
Male 9-Pin D-sub Pin #
Chiller / Slave
Female 9-Pin D-sub Pin#
2 (Receive – RXD)
2 (Transmit – TXD)
3 (Transmit – TXD)
3 (Receive – RXD)
5 (Ground)
5 (Ground)
Note: Use a null modem cable if your RS-232 is set up as a DCE.
Communication Specification
Speed:
9600 baud
Data Flow Control:
None
Data Format:
8-bit serial
Number of Stop bits:
1
Parity:
None
Transmission Breakdown:
One command byte followed by zero, one, or two data bytes depending on
data type.
Master/Slave:
ThermoCube is always the SLAVE (DTE)
Interrupts Reported:
None, must be polled for status
Transmission Length:
< 15 m
eters
Data Update Frequency:
Once per second
Maximum Polling Frequency:
Three commands per second
Female DB9
