GE Critikon Dinamap Compact NIBP User manual
HOST COMMUNICATIONS
COMPACT NIBP MONITOR
DOCUMENT NUMBER: 8555ER
17 March 1997
Author: O Eagles
Rev R. No. Checked by Date Approved by Date Reason for Change
01 IN294 A Coombes 27 May 1997 G A Thomas 27 May 1997 Original Document
02 R168 A Coombes 5 Dec 1997 G A Thomas 10 Dec 1997 CR756 Add Binnary comms
03 DAR1124
Describe new protocol software in V5.7. Also
add new Host Comms features and UI Interface
changes
Copyright in this document belongs to Critikon Ltd. The information contained herein which is confidential belongs to Critikon
Ltd. This document is not to be used for any purpose whatsoever without the prior written consent of Critikon Ltd.
Critikon Ltd
Host Communications Reference Manual
DINAMAP Compact Monitor
Host Communications
Reference Manual
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Host Communications Reference Manual
* TRADEMARK
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TABLE OF CONTENTS
INTRODUCTION................................................................................................................5
CONTENTS OF MESSAGES............................................................................................6
COMMUNICATIONS ERRORS.........................................................................................9
MONITOR MODES OF OPERATION..............................................................................11
UNIT IDENTIFIERS.........................................................................................................12
PARAMETER IDENTIFIERS AND COMMANDS............................................................13
NON-INVASIVE BLOOD PRESSURE COMMANDS.......................................................................................16
PULSE OXIMETRY COMMANDS.....................................................................................................................20
PRINTER COMMANDS.......................................................................................................................................21
HEART/PULSE RATE COMMANDS.................................................................................................................22
TEMPERATURE COMMANDS...........................................................................................................................23
THE “STAR” COMMANDS..................................................................................................................................26
APPENDIX A. ELECTRICAL SPECIFICATIONS..........................................................29
APPENDIX B. ASCII CHECKSUM CALCULATION......................................................30
APPENDIX C. NEGATIVE ACKNOWLEDGE CODES..................................................32
APPENDIX D. MESSAGES WITH CHECKSUMS.........................................................33
APPENDIX E. ALARM FLAG ENCODING....................................................................34
APPENDIX F. BINARY OUTPUT...................................................................................35
APPENDIX G. PROTOCOL REVISION NUMBERS......................................................48
APPENDIX I. 1846 COMPATIBILITY.............................................................................49
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INTRODUCTION
This publication describes the detailed design of the host
communications protocol for the DINAMAP Compact Model
7200 family of Monitors.
This document describes Host Protocol revision 01
For a further discussion of the host communications protocol
revision number, see (APPENDIX G. PROTOCOL
REVISION NUMBERS)
To understand what follows, the reader should have a
rudimentary understanding of the C programming language.
Data structures and small code fragments have been written
using C language notation.
The reader must also understand the concepts of bit,
character and message. A bit has the usual definition. A
character is an ordered set of eight bits. Messages are
ordered sets of characters.
The message is the basic indivisible unit of communications
between the host computer and the DINAMAP Compact
Monitor. Messages going from the host to the Monitor are
called command messages or just commands. Messages
going from the Monitor to the host are called response
messages or just responses.
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CONTENTS OF MESSAGES
Messages are passed back and forth between the host
computer and the DINAMAP Compact Monitor on an
asynchronous, serial, duplex communications link. The
default data rate is 9600 bits per second and can be
changed. See (APPENDIX A. ELECTRICAL
SPECIFICATIONS) for a detailed description of this electrical
and mechanical interface.
Characters are sent as 1 start bit, followed by 8 data bits (low
order bit first), followed by 1 stop bit. ASCII characters
occupy the low order 7 bits of an 8 bit data field. The 8th bit
is always zero for ASCII characters. In this document,
single ASCII characters and strings of ASCII characters are
given in double quotes. These character strings all use the
Courier type face; e.g., “This string uses Courier
type face”. The carriage return character is represented
by the symbol <CR>, which also uses the Courier type face.
All commands and most responses are made up from a
subset of the ASCII code set. The only ASCII characters
used in this protocol are the printable ASCII characters
(values of 32 through 126 or ′ ′ through ′~′, inclusive) and
the carriage return character (value of 13). By special
dispensation, the DINAMAP Compact Monitor ignores the
ASCII null character (value of 0).
A valid message is made up of the following sequence of characters:
“x…xss<CR>”
where "x…x" is a string of from 1 to 126 printable ASCII
characters that represent the contents of the message and
“ss” is the checksum. The checksum is a 12-bit sum
embedded in two printable ASCII characters. The method of
calculation of the checksum is described in (APPENDIX B.
ASCII CHECKSUM CALCULATION).
Command messages from the host computer to the
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DINAMAP Compact Monitor are either normal commands
or a negative acknowledge command.
• Normal Commands:
“upcd…dss<CR>”
where “u” is the unit address, “p” is a single character
parameter identifier, “c” is a single character command
identifier, “d…d” is a string of from 0 to 123 characters of
command data, and “ss” is a two character checksum.
• Negative Acknowledge Command (NACK):
“u-nss<CR>”
where “u” is the unit address, the ASCII minus sign is the
first character of the command string, “n” is a single decimal
digit and “ss” is the checksum. See (APPENDIX C.
NEGATIVE ACKNOWLEDGE CODES) for the meaning of
“n”.
Responses from the Monitor to the host computer are either
normal responses, negative acknowledge responses, or fatal
error responses.
• Normal Response:
“upcd…dss<CR>”
The normal command and the normal response have the
same structure.
• Negative Acknowledge Response (NACK):
“u-nss<CR>”
The NACK command and the NACK response have the
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same structure.
NOTE
In the previous paragraphs, the message strings were
explicitly shown to include the two checksum characters and
the terminating carriage return character. In the rest of this
document, these trailing characters are not shown, but their
existence is implied and their presence is required.
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COMMUNICATIONS ERRORS
A number of errors can be detected by either the host or the
DINAMAP™ Compact Monitor:
• Illegal character errors — Character received is
not in the range of ‘ ’to ‘~’,
• Serial input overrun — Host or Monitor can't
keep up with the other side. Since this protocol
is fully interlocked, this should never happen.
• Message checksum error — Last two
characters of the message don't agree with the
locally-computed checksum.
• Incorrect message length.
• Invalid parameter identifier — Parameter
identifier, ‘p’, is not valid for the Monitor.
• Invalid command identifier — Command
identifier, ‘c’, isn't valid for this parameter
identifier ‘p’.
• Timeout errors — Either 3 character times has
elapsed between non-<CR> characters, or 5
seconds have elapsed after sending a
command and no response has occurred. This
error is only detected by the host.
Each of the previous errors can be either a low-level error or
a high-level error. Low-level errors are illegal character, input
overrun, and message checksum errors. All other errors are
high-level errors. If either a low-level or high-level error is
detected by the host or a high level error is detected by the
DINAMAP™ Compact Monitor, the side that detects the error
should send the appropriate NACK message (see
(APPENDIX C. NEGATIVE ACKNOWLEDGE CODES). If a
low-level error is detected by the Monitor, the Monitor quietly
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ignores the error. This behavior should cause a “response
message timeout” to occur at the host.
When a NACK message is received by either the host or the
DINAMAP™ Compact Monitor, the receiver should retransmit the last valid message. The Monitor does not
impose a retry limit on NACK messages. The host computer
should, however, impose whatever limit is appropriate for the
particular application. If the Monitor receives a NACK before
the first valid message after it was turned on, the Monitor
quietly ignores it.
The DINAMAP™ Compact Monitor does not impose any
timeout between received characters, but the host computer
should. If power is removed from the Monitor before it can
finish sending a response, then the host will wait forever for
the response to finish. The Monitor never takes more than 2
character times to send the next character of a response
message.
The host computer should also impose a limit on the time to
wait for the first character of a response. The Monitor never
takes more than 5 seconds after receipt of the carriage
return character before it starts sending the response. If this
timeout occurs, one of three situations has probably
occurred;
1. the Monitor has been turned off,
2. the Monitor is on battery power and the
batteries have discharged, or
3. a communications error has occurred on the
carriage return character terminating the
command.
To deal with this third situation, the host should send an
illegal character (say, a 127) followed by a carriage return
character. This forces any partial command to be rejected
and the Monitor to respond with a NACK message.
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MONITOR MODES OF OPERATION
The DINAMAP™ Compact Monitor can be in any one of four
modes (or states). It's the responsibility of the host to keep
track of the state so the host display can clearly indicate
when the Monitor is not in normal operate mode. These
states are:
• Power-Off Mode. The Monitor is switched off
and cannot respond to any command.
• Operate Mode. This is the normal operating
mode of the Monitor. The host computer can
send commands and receive status messages.
• Service Mode. When the Monitor is in service
mode, the host communications protocol still
functions. The host software can determine if
service mode is active and should make this
clear to the user of the host software. Service
mode can only be entered from the Monitor
front panel (the procedure that puts the Monitor
into service mode is described in the service
manual). Once in service mode, operate mode
can only be restored by entering power-off
mode.
• Safe-State Mode. When an internal error is
detected, the Monitor enters the “safe state.”
The valves are open, the pump is off and the
Monitor ignores all command messages. Once
in safe-state mode, operate mode can only be
restored by entering power-off mode.
If the DINAMAP™ Compact Monitor is in power-off mode,
service mode, or safe-state mode, the host software should
take care that it's display doesn't lead the user to believe that
the Monitor is still in operate-mode.
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UNIT IDENTIFIERS
Normal commands start with a unit identifier. The unit
identifier can be any character from ‘ ’ to ’~’. The
DINAMAP™ Compact monitor defaults to unit identifier ‘ ’
The DINAMAP™ Compact Monitor responds to either of two
addresses. One of these addresses is always ‘ ’. The
other address can be set from the front panel of the Monitor.
In point-to-point applications, host software should use the
blank character as the address identifier.
In multi-drop applications, the host software should use the
unit identifier character that the user can set by selecting
from the “Main Menu/ More/Service/System/Comms” screen
on the Monitor. The identifier character must be unique for
all Monitors on a single multi-drop line.
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PARAMETER IDENTIFIERS AND COMMANDS
Normal commands have the following form:
“upcd…dss<CR>”
where “u” is the unit identifier, “p” is a single character
parameter identifier, “c” is a single character command
identifier, “d…d” is a string of from 0 to 123 characters of
command data, and “ss” is a two character checksum.
Parameter identifiers are assigned as follows:
“N” Non-invasive blood pressure
“O” Pulse oximeter
“P” Printer
“R” Heart or pulse rate
“T” Temperature
“*” DINAMAP™ Compact Monitor— Non-
parameter-specific
Each parameter identifier has associated with it a set of
command identifiers. The command identifiers do not have
fixed meaning and must be interpreted in the context of the
specified parameter identifier.
The following sections of this document contain detailed
descriptions of the commands and responses associated
with each parameter identifier. Note that the trailing
checksum and carriage return characters have been omitted
from these descriptions for clarity only and are still required
on the actual commands.
Certain general rules apply to command messages:
• Send commands exactly as shown. Don't send
too many or too few characters.
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• If a field in a command is numeric, don't send
commands with letters or special characters in
that field.
• If, due to a host program bug, the above rules
are violated, the DINAMAP™ Compact Monitor
may not gracefully ignore the command. If the
checksum is good, the Monitor may process the
command and produce unexpected results.
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Certain general rules apply to response messages:
• The host should first inspect the status fields in
a response message before any data field is
displayed or processed. Unless otherwise
specified, data fields of response messages are
undefined if the status fields of that response
message show the parameter to be off,
unplugged, in standby mode, or some other
unusal condition.
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NON-INVASIVE BLOOD PRESSURE COMMANDS
All DINAMAP™ Compact Monitor models have one channel
of non-invasive blood pressure. The following commands
are valid:
Command:
“uNA”
Read non-invasive blood pressure status
Response:
“uNAabcddddeeefffggg”
“a”
Determination status
“0” - Busy
“1” - Done OK
“2” - Not used
“3” - Determination failed (N99)
“4” - Pumpup timeout (N33)
“6” - Total time timeout (N44)
“7” - One-pressure timeout (N55)
“8” - Overpressure (N00)
“9” - Unknown NIBP status
“b”
Adult/neonate status
“0” - Unknown
“1” - Adult
“2” - Neonate
“c”
Determination type
“0” - Normal mode
“1” - Stat mode
“dddd”
Time since last determination of systolic diastolic and
mean arterial pressure (in seconds, 0 - 5400)
“eee”
Systolic pressure
“fff”
Diastolic pressure
“ggg”
Mean arterial pressure
Command:
“uNB”
Read cuff pressure channel
Response:
“uNBabbb”
“a”
Determination-in-progress indicator
“0” - Determination in progress
“1” - Determination not in progress
“bbb”
Current pressure
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Command:
“uNCa”
Start a determination
“a”
Type of determination
“0” - Non-stat
“1” - Stat mode
Response:
“uNC+”
Determination started OK
“uNC-”
The determination was not started or network remote
control disabled
Command:
“uND”
Cancel a determination
Response:
“uND+”
Determination cancelled OK
“uND-”
Determination not in progress or network remote
control disabled
Command:
“uNE”
Read NIBP alarm limits
Response:
“uNEaaabbbcccdddeeefff”
“aaa”
Systolic low limit
“bbb”
Systolic high limit
“ccc”
Diastolic low limit
“ddd”
Diastolic high limit
“eee”
Mean low limit
“fff”
Mean high limit
NOTES
The “time since last determination” field in the “uNA”
command only counts up to 5,400 seconds (90 minutes). If
this field contains a value greater than 5,399, then the
determination is too old and the exact age is unknown. In
this case, the values in the systolic, diastolic and MAP,
adult/neonate and determination type fields are undefined.
All fields of the “uNA” command except the status field
become valid after a good NIBP determination has
completed. During a determination, the status field shows
that the determination is in progress and all other fields show
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the results of the last good determination (if one existed and
isn't too old).
If an in-progress determination completes abnormally, all the
fields of the “uNA” command except the status field retain
their old values. In this case, the status field shows the
reason the determination terminated abnormally.
If an NIBP determination is cancelled, the status goes back
to “Done OK.” However, the “time since last determination” is
not reset. To properly detect the completion of a good
determination, the host computer should see the status go
from “Busy” to “Done OK” and the “time since last
determination” go backwards. Note that the host computer
may actually miss a time of exactly 0. The host computer
should therefore simply look for time to go backwards.
The “uNCa” and “uND” commands can be disabled by the
user from the DINAMAP™ Compact Monitor front panel.
This control is in the SERVICE menu. The path to this
screen is:
Main Menu/More/Service/System/Comms
If network control is disabled, these commands respond
with a NACK.
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