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2 Theory of Operation
1006-0836-000 02/03
2-17
2.4.7 Serial interface
The serial board (SAB/SICB) provides two functions:
•
It serves as an interface between the control board and switches that
are located in the machine itself (not in the breathing system).
•
It processes serial communications signals from the control board
to the RS232 connector (COM 1) on the back panel of the Aestiva
machine.
Machine Switches
The machine switches include:
•
the System On/Standby switch
•
the O
2
supply pressure switch
•
the O
2
flush switch
Serial Communications
The serial interface provides isolated RS232 serial communications. The
TXD (transmit) and RXD (receive) signals between the SAB and the control
board are at RS232 levels.
Circuits on the board change the signals to digital 5V levels; isolate them
through optocouplers; then, change them back to RS232 levels before
sending them to the outside world.
•
The external communications signals conform to standard
RS-232C signal standards.
•
COM 1 is a 15-pin female D connector.
•
It’s configured for Data Communications Equipment (DCE)
•
Pin 6 - receive data
•
Pin 13 - transmit data
•
Pin 5 - signal ground
In addition to the above, the SICB in the Aespire machine provides remote
monitor On/Off through an isolated relay.
•
Pin 1 - MON On/Standby
•
Pin 9 - MON On/Standby return
MACHINE SWITCHES
CONNECTOR
7100 CONTROL BOARD
CONNECTOR
RS232
ISOLATED
DRIVER /
RECEIVER
ISOLATION
TRANSFORMER
OPTICAL
ISOLATORS
7100 SERIAL POR
T
CONNECTOR
ISO_RXD1
ISO_TXD1
ISO_RXD
ISO_TXD
RXD1_232
TXD1_232
RXD_232
TXD_232
/O2_FLUSH
GND
LOW_O2_SW
GND
/O2_FLUSH
LOW_O2_SW
REM_ON
REM_ON
ISOLATED POWER
RS232
ISOLATED
DRIVER /
RECEIVER
AB.43.096
Note regarding SICB:
The machine switch signals
come in on three separate
connectors.
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