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Precision Flow Plus Nurse Call and EMR
Installation Instructions
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Precision Flow Plus Nurse Call and EMR Installation Instructions Revision B
Document Number: 3100970 Page 2 of 12
Table of Contents
Nurse Call Installation Instructions ....................................................................................................3
1 Introduction ...........................................................................................................................3
2 Scope .......................................................................................................................................3
3 Hardware Interface Description ........................................................................................3
3.1 Nurse Call Interface ................................................................................................................................ 3
4 Wiring Guide: Connecting the Nurse Call Cable ...........................................................3
4.1 Figure 1: Nurse Call & EMR Cable Schematic ................................................................................ 4
4.2 Figure 1A: 3.5mm Stereo Audio Jack Male Pinout ....................................................................... 4
4.3 Figure 2: System Schematic ................................................................................................................. 5
5 Installation Instructions ......................................................................................................5
6 Alarms .....................................................................................................................................5
6.1 Table 1: Alarms that signal Nurse Call ............................................................................................. 6
7 Installation Verification Procedure ..................................................................................7
EMR Installation Instructions ............................................................................................................8
8 Introduction ...........................................................................................................................8
9 Scope .......................................................................................................................................8
10 Hardware Interface Description ........................................................................................8
10.1 Hardware ................................................................................................................................................... 8
10.2 Serial Port Configuration / Parameters .......................................................................................... 9
11 Communication Interface Description .............................................................................9
11.1 Introduction .............................................................................................................................................. 9
11.2 EMR Data Acquisition General Description ................................................................................... 9
11.3 Null Byte in message ........................................................................................................................... 10
11.4 EMR Data Format Specifics ............................................................................................................... 10
12 Installation Instructions ....................................................................................................11
13 Installation Verification Procedure ................................................................................12
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Nurse Call Installation Instructions
1 Introduction
This document describes the Nurse Call communication interface of the Precision Flow Plus
device. This document is intended for use by hospital IT, biomedical engineering or other experts
who wish to connect the Precision Flow Plus into a Nurse Call system.
2 Scope
This document applies to the current design and embedded firmware version of the Precision
Flow Plus unit. The current software version is 3.12.0. This document does not cover any
earlier versions of Precision Flow Plus embedded firmware and will require a review and
update for future versions of the firmware.
3 Hardware Interface Description
3.1 Nurse Call Interface
The Nurse Call / EMR Communication Cable (Part No. 3100897) contains a 3 pin 3.5 mm Stereo
Audio Jack (See P2 in Figure 1) for indicating an alarm condition on a hospital nurse call system
and a DB9 female Data Jack for interfacing Electronic Medical Record capable technologies.
An adapter or re-termination of the cable’s 1/8 in. (3.5 mm) stereo audio jack connection will be
necessary and shall be supplied by the user to connect the Nurse Call Interface Adapter to the
hospital’s nurse call system.
4 Wiring Guide: Connecting the Nurse Call Cable
The cable’s 3.5mm stereo jack supports “Normally Open” and/or “Normally Closed” Nurse Call
system connections.The signals on the 3 connector contacts are (see P2 in Figure 1 and Figure
1A):
• Normally Closed (pin 18 of HDMI connector) Ring or Right Channel of 3.5mm audio Jack
(See Figure 1A)
• Normally Open (pin 14 of HDI connector) Tip or Left channel of 3.5mm audio Jack (See
Figure 1A)
• Common (pin 16 of HDMI connector) Sleeve or common channel of 3.5mm audio Jack (See
Figure 1A)
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4.1 Figure 1: Nurse Call & EMR Cable Schematic
4.2 Figure 1A: 3.5mm Stereo Audio Jack Male Pinout
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4.3 Figure 2: System Schematic
5 Installation Instructions
Remove the silicone plug in the oxygen sensor cover on the back of the Precision Flow Plus
and plug in the HDMI connector of 3100897 into the HDMI port of the Precision Flow Plus.
Connect the other end of the properly terminated cable to the hospital Nurse Call system. Refer
to figures 1, 1A and 2 for circuit diagram and schematic reference.
6 Alarms
Precision Flow Plus Alarms that signal the Nurse call station are defined in Table 1. Also,
embedded software shall detect a control system fault if any of the Precision Flow Plus sensor
count values are out of range for more the 5 seconds. These control system faults shall illuminate
the General Fault Alarm, sound the medium priority alarm and will display a numeric fault code
(50 through 83) in the temperature display on the LED display. These control system faults shall
also trigger the nurse call station.
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6.1 Table 1: Alarms that signal Nurse Call
Alarm icon
Audio Signal
Indicates
General fault (flashing)
Medium Priority
Cannot be muted
Malfunction of sensor or control system
General fault (flashing)
% O2 displays dashes (- -)
Medium Priority
Cannot be muted
O2 sensor fault
Blocked tube (flashing)
Medium Priority Mutes
only during brief reset
period
High back pressure
Water out (flashing)
Medium Priority
No water in disposable water path. Gas flow continues without heating or
water circulation.
Disposable water path
(flashing)
Medium Priority
Disposable water path faulty or not detected. Unit will not run.
Battery (flashing)
Medium Priority
The unit is running in BATTERY mode. Gas flow and blending continue without
heat or water circulation.
Cartridge fault
Medium Priority
Cartridge and/ or DPC not detected. Unit will not run
Cartridge Fault
Low Priority
Gas bubbles in water circulation. Unit continues to operate.
Gas supply (flashing) Gas
supply (continuous and flow
rate numeric display flashes)
Medium Priority
Gas supply pressure outside 4-85 psi (28-586 KPa) range. Unit will not
operate.
Gas supply (flashing) Gas
supply (continuous and flow
rate numeric display flashes)
Medium Priority
Selected flow cannot be provided from current gas supply.
Temperature display shows
dashes (- -) flashing, &
General Fault icon
Medium Priority
Can- not be muted
Temperature out of range.
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7 Installation Verification Procedure
Verify that the complete system is functioning by creating a test alarm and checking that the
correct result has been received.
1. Connect and turn on the Precision Flow Plus. Refer to Section 7 of the Precision Flow Plus
Instruction for Use (3100954)
2. Force an alarm occurrence, by placing your thumb over the distal end of the delivery tube to
simulate a blocked tube condition.
3. Confirm that you receive the result you expect in the system according to the hospital standard
for that alarm, such as a warning light is turned on or an audio signal is received.
4. Release your thumb from over the distal end of the delivery tube to clear the blocked tube
condition and confirm that the nurse call alarm condition clears.
After the test has been successfully concluded, the Nurse Call is ready for use.
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EMR Installation Instructions
8 Introduction
This document describes the serial communication interface of the Precision Flow Plus device
for use with EMR Systems. This document is intended for use by computer programmers and
other experts who wish to implement an EMR system with the Precision Flow® Plus.
Data transfer uses a physical RS-232 connection and a communication protocol described in this
document.
9 Scope
This document applies to the current design and embedded firmware version of the Precision
Flow Plus unit. This document does not apply to firmware versions prior to 3.12.0. This
document only applies to EMR implementations.
10 Hardware Interface Description
10.1 Hardware
The Precision Flow Plus has an HDMI style connector on the back of the unit. The Vapotherm
Nurse Call / EMR Communication Cable (Part No. 3100897) has an HDMI connector on one
end and a DB9 Female RS-232 connector on the other end. This cable can be used to connect
the PF Plus to standard RS-232 port on a EMR system. The pin out of this cable is shown in
Figure 1
Figure 1: Nurse Call / EMR Communication Cable
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10.2 Serial Port Configuration / Parameters
The serial communication configuration is:
• 38,400 baud rate
• 8 data bits per word
• 1 Stop bit
• No parity
• No hardware flow control
All data transmitted and received are in ASCII format.
11 Communication Interface Description
11.1 Introduction
The communication protocol is a command/response system. The EMR system will send a
request for data and the Precision Flow Plus will respond.
In addition, the Precision Flow Plus will transmit certain messages without a request from the
EMR system (asynchronous messages). These messages can be ignored by the EMR system and
are typically sent when certain events or conditions change on the Precision Flow. For
example, when air supply gas is connected to the Precision Flow the embedded firmware will
send a status message, an example is shown below:
User flow rate changed from 0.5 to 5.0
OpMode=Single_Gas:Air
11.2 EMR Data Acquisition General Description
EMR systems may acquire the current therapy delivery status and parameters by sending a single
carriage return character (<CR>, ASCII code 13 dec, 0x0D hex) to the Precision Flow. This is
a status request.
The Precision Flow will respond with an ASCII text formatted message (status message) that
will include the follow items of information:
• Temperature (User Selection and Current Temperature)
• Flow Rate (User Selection and Effective Flow Rate)
• FiO2 (User Selection and measured concentration)
• Operating Mode
All messages sent from the PF Plus unit are terminated with a carriage return character and a line
feed character (<CR><LF>) sequence.
The Precision Flow Plus will respond to each status request with current data. The EMR can
send status requests as frequently as required to meet data acquisition requirements. However,
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the EMR system should not send a new request before the Precision Flow Plus has responded to
a previous request. In other words, the EMR system cannot send 5 carriage return characters in
rapid sequence and expect the Precision Flow Plus to output 5 status messages; send one
carriage return, get one response, repeat.
11.3 Null Byte in message
The Precision Flow Plus will occasionally insert a ‘null’ (ASCII code 0) byte in a message.
The software in the EMR system must remove this byte from the received message to accurately
parse the message. Note: The null byte is an extra character, removing this byte will yield a
complete message line from the Precision Flow Plus .
11.4 EMR Data Format Specifics
When the EMR sends a <CR> byte the Precision Flow Plus will respond with two lines of data
(each terminated with <CR><LF> characters). Example output is shown below:
Temp=33(22) Flow=5.0(5.0) O2%=021(18.2) Mode=Standby OpMode=Single_Gas:Air
water=out Faults: 0x00000000 = None.
Each of the three user selectable parameters are shown with corresponding current data. The
user setting is the number that follows the ‘=’ character, and the current data is the number in the
parentheses. Current data values are detailed below:
Temperature: Current water temperature as measured in the water return path.
Flow Rate: The number in the parentheses is the effective flow rate. The effective flow rate is
determined from the FiO2 setting and the current gas supply pressures. The effective
flow rate will be lower than the user selected flow rate if there is not sufficient gas supply
pressure to reach the user desired flow rate.
O2%: The current O2 concentration as measured by the O2 sensor. Note: The O2 sensor requires
periodic calibration that is initiated automatically by the Precision Flow Plus system. In
addition, when the Precision Flow Plus is not in run mode, there will not be a
continuous gas flow at the O2 sensor, therefore this value will not always match expected
values. The Precision Flow Plus system is designed to handle O2 sensor re-calibration
and sensor accuracy when appropriate based on operating conditions. In terms of EMR
data acquisition and therapy delivered to the patient, the user setting value should always
be used and indicates the FiO2 percentage delivered.
In addition to the user selectable parameters the status message includes the current operating
mode, supply mode status, DPC water status, and current fault conditions.
Mode: This is current operating mode of the Precision Flow Plus ; possible values are:
“Standby”: The Precision Flow
Plus is not delivering therapy.
“Run”: The Precision Flow
Plus is currently delivering therapy.
“Run(warm)”: The Precision Flow Plus is delivering therapy, but the water
temperature has not yet reached the user selection.
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“Battery”: The Precision Flow
Plus is flowing and metering gas, but the AC power has
been lost and the Precision Flow Plus has turned off the heater to conserve energy.
“Fault”: The Precision Flow
Plus has detected a fault condition and is not delivering
therapy.
OpMode: This indicates the gas supply status. Possible values are:
“No_Gas”: Neither the O
2
or Air supplies are connected.
“Single_Gas:O2”: Only the O
2
supply is connected.
“Single_Gas:Air”: Only the Air supply is connected.
“Dual_Gas”: Both O2 and Air supplies are connected.
Water: Indicates presence of water in the DPC water path.
Faults: If there are no faults detected, this value will be zero formatted as a hexadecimal
number. It is beyond the scope of this document to describe the faults and it is not necessary for
EMR implementation. The EMR system should always use the mode information described
above to determine when therapy is being delivered to the patient.
Example data parsing:
Temp=33(22) Flow=5.0(5.0) O2%=021(18.2) Mode=Standby OpMode=Single_Gas:Air
water=out Faults: 0x00000000 = None.
The user selected temperature is 33 degrees and the temperature as measured by the sensor at the
water return path is 22 degrees.
The user selected flow rate is 5.0 LPM and there is sufficient supply pressure to reach 5.0 LPM
at the current FiO2 setting.
The user selected FiO2 percentage is 21%. The O2 sensor is currently reading 18.2%, however
since the Precision Flow Plus is not currently flowing gas, this reading is likely not accurate.
The Precision Flow Plus is in standby mode and is not flowing gas or delivering therapy.
Only the Air supply is connected.
The water sensor is not detecting water in the DPC (note: the DPC may not be inserted).
There are no fault conditions detected.
12 Installation Instructions
Remove the silicone plug in the oxygen sensor cover on the back of the Precision Flow Plus
and plug in the HDMI connector of 3100897 into the HDMI port of the Precision Flow Plus.
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Connect the other end of the properly terminated cable to the hospital EMR System. Refer to
figures 1 for circuit diagram and schematic reference.
13 Installation Verification Procedure
Verify that the complete system is functioning by placing the Precision Flow Plus in run mode
and checking that the correct status has been received.
1. Connect and turn on the Precision Flow Plus. Refer to Section 7 of the Precision Flow
Plus Instruction for Use (3100954).
2. Initiate connection between the Precision Flow Plus and the hospital EMR system.
3. Initiate a response at the EMR system from the Precision Flow Plus and confirm the
received data is correctly represented at the EMR system.
After the test has been successfully concluded, the Precision Flow Plus EMR System is ready
for use.
Vapotherm Inc.
100 Domain Drive
Exeter, NH 03833
USA
Phone: 603-658-0011
Fax: 603-658-0181
For further information contact:
Vapotherm Inc.
100 Domain Drive
Exeter, NH 03833
USA
Phone: 603-658-0011
Fax: 603-658-0181
www.vapotherm.com
May be patented
www.vtherm.com/patents
Technical Support Line
Domestic: 855-557-8276
International: 603-658-5121
TS@Vtherm.com
RMS–UK Ltd.
28 Trinity Road
Nailsea, North Somerset BS48 4NU
United Kingdom
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