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Verfügbare Sprachen
Verfügbare Sprachen
THE SERIAL INTERFACE
The on-chip UART is used to implement an RS-232 interface. Bit O and 1 of port 2 is
used as the UART transmitter output and receiver input respectively. Additionally, high
speed input bit 3 is used as the CTS input and bit 7 of port 2 is used as the RTS out-
put. The UART has an integral baud rate generator. Different values are written to the
baud rate value register to generate different baud rates.
The signals from the UART are buffered by U4, a MAX232 RS-232 driver/ receiver. The
nominal output voltage levels of the MAX232 is +/-9V.
THE DSB INTERFACE
The Datascope Bus Interface is implemented by a software UART using the high
speed input and output section of the 80C196. High speed input bit 0 is used as the
input; and high speed output bit 4 is used as the output. Q4 and associated com-
ponents implements the proper bidirectional buffering to Pin 9 of the DSB connector
42.
PC Interface For The ACCUTORR
All characters received and sent are in standard ASCII format. There are no packets,
checksums, etc. Other details of the RS232 interface are:
standard asynchronous mode
8 data bits ,
1 start bit
1 stop bit
no parity
baud rate selectable frorn the User Gonfiguration Menu
At power up the following will be sent:
ACCUTORR PC Interface is ready
>
At this point the ACCUTORR will be available to accept a command.
A command is
executed by sending the ACCUTORR a single character when the " prompt is
present.
There are three valid commands:
Command
Character
Notes
Show alarm limits
"po
Show patient information
"pe
Prompt request
"С"
Assures prompt available
AC = ASCII code 03
1-52
Revised 08/24/00
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