Remote Alarm Contacts And Analog Output - Thermo Scientific 8600 Series Operating And Maintenance Manual

RS-232 Communications
(continued)
Remote Alarm Contacts
and Analog Output
Thermo Scientific
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)
Note The RS-232 is not compatible with Model 1535 Monitor/Alarm
System.
s
Model 8600 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 shipped 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.
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.
IMPORTANT USER INFORMATION IMPORTANT USER INFORMATION
LF - Line feed
EOT - End of text (4)
4-20 mA
Temperature -100 to +50°C
Figure 1-9. Output Specifications
Section 1
Installation and Start-Up
Figure 1-8. Remote
Contacts in Alarm
0-1V 0-5V
-100 to +50°C -100 to +50°C
Model 8600 Series 1-7