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RS-232 Communications
(continued)
Remote Alarm Contacts
and Analog Output
VWR International
The data transfer sequence is transmitted in the following format. X refers
to numerical temperature data.
(NUL) (-) XXX (SP) C (SP) (OVERTEMP) (SP) (LF) (CR) (EOT) (SP)
(UNDER TEMP)
The words "OVER TEMP" or "UNDER TEMP" are transmitted when
an alarm condition exists along with the temperature. If no alarm
condition exists, spaces will be sent. A total of 20 characters will be sent.
SP - Space
CR - Carriage return
NUL - Null character (00)
The Model 5600 Series freezer has remote alarm contacts and analog
output. See Figure 1-2 for the location of the remote alarm contacts. The
remote alarm connector is located in the parts bag provided with the
manual. It must be installed if connecting the freezer to an alarm system.
After installing the wiring from the alarm system to the connector, install
the connector to the freezer microboard and secure with the two screws
provided. The remote alarm provides a NO (normally open) output, a NC
(normally closed) output and COM (common). The contacts will trip on a
power outage, high temperature alarm or low temperature alarm. Figure 1-
8 shows the remote contacts in alarm state.
Figure 1-8. Remote Alarm Contact Pins
The analog output function allows the freezer to output signals
representing the temperature of the freezer cabinet. The factory default
setting is 4-20 mA. Refer to Figure 1-9 for output specifications.
4-20 mA
Temperature
-100 to +50°C
Figure 1-9. Specifications
LF - Line feed
EOT - End of text (4)
IMPORTANT USER INFORMATION
IMPORTANT USER INFORMATION
aution! Stored product should be protected
by a redundant 24 hour/day monitoring
system with alarm capability. An interconnect
jack and thermocouple are installed
for centralized monitoring, should on-board
system fail.
0-1V
-100 to +50°C
Section 1
Installation and Start-Up
0-5V
-100 to +50°C
Model 5600 Series
1-7
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