CPU Control Module Theory of Operation
2 - 8 0070-10-0441 Passport 2®/Passport 2 LT™ Service Manual
2.1.16 CO Interface Connector, J4
This connector connects the Communications Processor Module Bus to the External Parameter
Module. In addition power (+5Vdc and +12V2) and ground are provided. The digital
signals are protected from ESD by capacitors C489 to C494.
2.1.17 Recorder Interface
The recorder interface (J8) is a serial interface which is 8 bit, 1 stop bit, no parity and a
baud rate of 38.4K. The recorder interface is implemented using the MPC860T SCC4.
The recorder is controlled by sending a series of software commands along with data over
the serial interface. The recorders electronics process the incoming commands and data and
send print information to the print head.
Hardware handshaking is provided using the RTS*/CTS* control lines. Handshaking signals
are used to control the transmission of data to the recorder and to ensure that the MPC860T
does not send another command until the current one has been processed.
The RECRST* signal is used to reset the recorder. This signal is an active low output from
PB(16) of the MPC860T and is a software control function.
There is an additional signal which is located on the connector, IRQ3*, which indicates
when data can be sent.
This connector also provides an interface to the fan for control and monitoring. There is a
control line from the MPC860T to turn the fan on or off and a status signal that indicates if its
functioning.
2.1.18 CO
2
Interface Connector, J23
This connector connects the Communications Processor Module Bus to the external CO2
module. In addition power (+5 Vdc and +12V2) and ground are provided. The digital
signals are protected from ESD by capacitors C136 to C139.
2.1.19 NIBP Interface Connector, J25
This connector connects the Communications processor module bus to the external NIBP
module. In addition power (+5 Vdc, +12V2) and ground are provided.
2.1.20 Defib Connector, J24
This connector provides the interface to an external Defibrillator. SMC1 is provided if serial
communications is necessary. There is a provision to accept a logic signal that is monitored
by input PB(14) on the MPC860T. There is a provision for an analog input signal that is fed
to the 10 bit A/D converter that is contained with the Communication processor (916X1). In
addition there is a re-created analog output (ECG_OUT) of the ECG waveform and a
ECG_SYNC signal which is the E trigger from the front end electronics. The ECG_SYNC
signal which is the E trigger from the front end electronics or ECG_SYNC created by the 12
lead communications data from the Mortara card within the MPC860T. The source is
controlled by the MPC860T. All signals are filtered with T-Pole filter devices.
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