Thermo Scientific 3881, Руководство по эксплуатации и техническому обслуживанию

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Connect the unit to an adequate dedicated power supply. Refer to the
electrical data plate for exact electrical specifications.
RS-232 data from the Alarm/ Monitor circuit board is provided by a RJ-11
telephone style connector located on the back of the cabinet. Refer to
Figure 2-5 for pin identification and Figure 2-10 for connector location.
Temperature data is transmitted once every hour in a 20-bit format, with
17 bits displayed on the terminal screen. The format first provides the
temperature (-)XX.X C, then OVER, UNDER, or (blank). Blank denotes
the temperature is within the upper and lower setpoints.
Sending an ASCII XON (DC1 (“11” hexadecimal) command to the RS-
232 enables this transmission, sending XOFF (DC3 (“13” hexadecimal)
stops it.
The remote alarm relay may be wired to a central remote alarm location or
to an independent alarm system.
Connection to the refrigerator is through an RJ-11 terminal block located
on the back of the cabinet. Pin identifications are shown in Figure 2-5.
2-4 7033881 Blood Bank Thermo Scientific
Section 2
Installation and Start-Up
Connecting to Power
Connecting RS-232
Communications
RS-232 data format
Figure 2-5. RS-232 and Remote Alarm Contacts
Connecting the
Remote Alarm Relay