Theory of Operation
Chapter 3: Theory of Operation
Isolette® Infant Incubator (Model C2000) Service Manual Page 3 - 35
3
RS-232 Serial Port Protocol
The RS-232 serial port connector is next to the AC power connector on
the front of the incubator. The serial port is configured for 2400 baud, 8
data, 1 stop, no parity, and is output only (see figure 3-16 on page
3-35).
Figure 3-16. RS-232 Connector Pin Outs
During normal operation, a data packet transmits every 5 seconds.
Each data packet is entirely in American Standard Code Information
Interchange (ASCII) and is readable when displayed on any standard
RS-232 terminal device. A data packet consists of one 82-character line
of text that is composed of a prefix, a data portion, a suffix, a checksum,
and a carriage return/line feed (CR/LF) pair.
The prefix identifies the data line. It consists of an opening bracket and
an ID character that are unique to the data line. The format of the data
portion depends on the specific data line. Any character positions within
the data portion that are undefined transmit as spaces to enhance the
readability of the output. The suffix property limits the data portion and
consists of a closing bracket.
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