EG05000 - Medlab GmbH
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1. OX Jot Tok Jel tel A C61C48 m P A Ica ao C42 D Wmo ooo ofofo All Dimensions in mm mechanical drawing top view of the module 1 1 Overview The EG05000 is a five lead ECG module The module can work with a five lead cable to show 7 channels with a four lead cable showing 6 channels and with a three lead cable to show one channel of ECG An advanced pulse detection algorithm is integrated The board includes a full type CF patient isolation and is powered by a single 5 VDC supply consuming less than 250 mW All input leads are fully defibrillation protected It is possible to measure the respiration rate of the patient using the impedance change between the electrodes For this the optional respiration board has to be attached to the module When using a five lead cable the module can output the following channels synchronously Ill aVR aVL aVF C When using a four lead cable the module can output the following channels synchronously Ill a2. 2 mV and 700 mV pulse amplitudes the EG05000 correctly displays heart rate as zero bpm Asystole b For single ventricular only pacemaker pulses with normally paced QRS T with 0 1 and 2 0 ms pulse widths and 2 mV and 700 mV pulse amplitudes the EG05000 correctly displays heart rate of the QRS T rhythm 60 bpm for the specified test waveform c For single ventricular only pacemaker pulses with ineffectively paced QRS pattern with 0 1 and 2 0 ms pulse widths and 2 mV and 700 mV pulse amplitudes the EG05000 correctly displays heart rate of the underlying QRS T rhythm 30 bpm for the specified waveform d For atrial ventricular pacemaker pulses alone with 0 1 and 2 0 ms pulse widths and 2 mV and 700 mV pulse amplitudes the EG05000 correctly displays heart rate of zero bpm Asystole e For atrial ventricular pacemaker pulses with normally paced QRS T with 0 1 and 2 0 ms pulse widths and 2 mV and 700 mV pulse amplitudes the EG05000 correctly displays heart rate of the QRS T rhythm 60 bpm for the specified test waveform f For atrial ventricular pacemaker pulses with ineffectively paced QRS pattern with 0 1 and 2 0 ms pulse widths and 2 mV and 700 mV pulse amplitudes the EG05000 correctly displays heart rate of the underlying QRS T rhythm 30 bpm for the specified test waveform With over and undershoot a For single ventricular only pacemaker pulses alone with 0 1 and 2 0 ms pulse widths and 2 mV an
3. I Il Ill aVR aVL aVF C1 Respiration Example 1 the host requests l aVF and C1 to be transmitted Wave 1 will be l Wave 2 will be aVF and Wave 3 will be C1 the block being 5 bytes long Example 2 the host requests C1 and respiration waveform to be transmitted Wave 1 will be C1 Wave 2 will be respiration waveform the block being 4 bytes long A value block contains three bytes Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0 Bit 1 Bit 0 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0 Chksum Chksum Chksum Chksum Chksum Chksum Chksum Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Value Value Value Value Value Value Value 13 Version 1 09 Bit 0 Value Medlab GmbH EG05000 User Manual 3 bytes are transmitted in this block Type 00 gt not used Type 10 gt respiration value Type 01 gt pulse value Type 11 gt not used but reserved for future extensions The checksum is the sum of all bytes in the block with byte 2 the chksum itself ignored for the sum It includes the sync character byte 1 Since only 7 bits are used the result is anded with 0x7F The values are limited to a number of 0xF7 so no mix up with sync bytes can occur A Status block contains six bytes Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0 Byte 1 Sync 0 Byte 2 Bit 6 Bit5 Bit 4 Bit3 Bit2 Bit1 BitO Chksum Chksum Chksum Chksum Chksum Chksum Chksum Chks
4. 0 5 mV to 5 mV for durations of the QRS wave ranging from 40 ms to 120 ms up to a signal rate of 350 BPM Response to irregular rhythm Section 6 8 2 bb 4 A1 Ventricular bigeminy the EG05000 counts both large and small QRS complexes to display a rate of 80 bpm A2 Slow alternating ventricular bigeminy the EG05000 counts both large and small QRS complexes to display a rate of 60 bpm A3 Rapid alternating ventricular bigeminy the EG05000 counts all QRS complexes to display a rate of 120 bpm A4 Bi directional systoles the EG05000 counts all QRS complexes to display a rate of 90 bpm Heart rate meter response time Section 6 8 2 bb 5 a Change from 80 to 120 BPM 4 sec b Change from 80 to 40 BPM 7 sec Time to alarm for tachycardia Section 6 8 2 bb 6 Waveform B1 Amplitude Time to alarm 0 5 mV 1 sec 1mV 1 sec 2 mV 1 sec Waveform B2 Amplitude time to alarm 1mV 1 sec 2 mV 1 sec 4 mV 1 sec Version 1 09 8 Medlab GmbH EG05000 User Manual Pacemaker pulse display capability See IEC 601 2 27 clause 50 102 12 The EG05000 is capable of displaying the ECG signal in the presence of pacemaker pulses with amplitudes of 2 mV to 700 mV and durations of 0 5 ms to 2 0 ms An indication for the pacemaker pulse is provided Pacemaker pulse rejection See IEC 601 2 27 clause 50 102 13 Without over and undershoot rectangular pulse a For single ventricular only pacemaker pulses alone with 0 1 and 2 0 ms pulse widths and
5. VF and C ECG cable connection 7 Version 1 09 Medlab GmbH EG05000 User Manual Technical description for TRF IEC 60601 2 27 When preparing a test report form TRF for proof of compliance of the users medical product to IEC60601 2 27 2005 the following remarks technical data will be helpful or needed Input Impedance gt 10MOhm Common mode rejection ratio gt 90 dB at 50 Hz or 60 Hz Input Dynamic Range 5 mV AC 300 mV DC Defibrillator Discharge Recovery lt 10 sec per IEC 601 2 27 lt 10 sec per AAMI EC 13 1992 Leads off sensing current Applied currents less than 150 nA The following information references particular sections of IEC and EN 60601 2 27 Respiration optional Section 6 8 2 bb 1 Applied currents less than 80 uA 90kHz square Tall T wave rejection Section 6 8 2 bb 2 T wave of 1 2 mV amplitude will not affect heart rate determination Heart rate averaging Section 6 8 2 bb 3 The pulse rate is averaged over the last 12 detected pulses QRS Detection various sections If the EG05000 is set to adult mode the heart rate meter will not respond to ECG signals having a QRS amplitude of 0 15mV or less or R waves of a duration of 10 ms or less with an amplitude of 1 mV The detection range of QRS amplitudes is 0 5 mV to 5 mV for durations of the QRS complex ranging from 50 ms to 120 ms up to a signal rate of 300 BPM If the EG05000 is set to neonate mode the detection range of QRS amplitudes is
6. VR aVL aVF When using a three lead cable the module can output the following channels or II or Ill Version 1 09 4 Medlab GmbH EG05000 User Manual Module Connectors Mounting Holes Connector Respiration Board ofolfolfolo D z C35 063 245 Z 4 4 54 ap C12 sed IC10 cag u RS C23 Patient Cable Connector 900000000000 Host amp Power Connector n Patient Isolation Connector Respiration Board Description of connectors and areas of the module 1 1 Physical Units of Data Scaling of ECGs is done in the units cm mV for the Y axis and in mm sec for the X axis Respiration rate is transmitted in rpm respirations per minute Pulse rate is transmitted in bpm beats per minute Transmission speed for the wave is indicated in Hz sec 1 ECG amplitudes are typically indicated in cem mV Since this is directly depending on the resolution of the screen th
7. agnostic mode selectable by command 0 67 Hz monitoring or 0 05 Hz diagnostic 40 Hz monitoring or 70 Hz diagnostic 30 247 bpm 1 1 Digit 12 beat average 5 99 rpm 3 1 Digit 8 samples average option Pacemaker detector 2mV to 700mV 0 5 2ms pulse width can also be turned off Asynchronous serial output with CMOS levels 0 5 V Separate pulse trigger output CMOS levels 0 5 V Both outputs fully isolated from patient Bidirectional packet oriented serial protocol Mechanically compatible to Medlab EG01010 three channel OEM board and the EG12000 twelve channel ECG board Medlab GmbH EG05000 User Manual Connectors Header for host connection JP1 Ground Ground Txd RS232 level 5Volt Txd TTL level Rxd RS232 level 5Volt Rxd TTL level Notconnected Notconnected Notconnected 10 Notconnected 11 Pulse Trigger output 12 Pulse Trigger output 13 Shutdown 14 Shutdown VCC level on these pins powers down module 15 VCCinput 16 VCCinput OONDARWNDY Header for patient cable connection SV1 1 C IN Chest 2 SHIELD Isolated Ground 3 LL IN Left Leg 4 RA IN Right Arm 5 LA IN Left Arm 6 SHIELD Connected to pin 2 TA RL IN Right leg Three Lead Patient Cable Four Lead Patient Cable Five Lead Patient Cable lor Il or Ill I and II and Ill I and II and Ill and aVL and aVR and aVF and aVL and aVR and a
8. ation Normal operation pacemaker detected Initializing Searching for electrodes Simulated output Selftest error Not used but reserved oelftest error 10 errors are fatal The module will never go into measuring state Status message 8 will be transmitted as long as simulated data is transmitted Version 1 09 Medlab GmbH EG05000 User Manual Commands from Host to Module All commands have a one or two byte structure They are also sent to the module with 115200 baud The commands are sent in ASCII format Basic Bandwidth of ECG amplifier Diagnostic or Monitoring mode F Parameter 0 or 1 0 bandwidth of the amplifier DC 80 Hz Diagnosticmode bear in mind mains filter setting 1 bandwidth of the amplifier 0 67 40 Hz Monitoringmode resetvalue Transmission frequency ofthe waveform packet Parameter 0 1 2 or 7 0x53 0x31 for example for S1 0 send waveform packets 50 times per second 1 send waveform packets 100 times per second reset value 2 send waveform packets 150 times per second send waveform packets 300 times per second Amplification of the waveforms A Parameter 0 17 2 or 3 0x41 0x31 for example for A1 0 Amplification stage 1 lowest amplification should be scaled to 0 5 cm mV 1 Amplification stage 2 2 Amplification stage 3 3 Amplification stage 4 highest amplification should be scaled to 4 c
9. d 700 mV pulse amplitudes the EG05000 correctly displays heart rate of zero bpm Asystole b For single ventricular only pacemaker pulses with normally paced QRS T with 0 1 and 2 0 ms pulse widths and 2 mV and 700 mV pulse amplitudes the EG05000 correctly displays heart rate of the QRS T rhythm 60 bpm for the specified waveform c For single ventricular only pacemaker pulses with ineffectively paced QRS pattern with 0 1 and 2 0 ms pulse widths and 2 mV and 700 mV pulse amplitudes the EG05000 correctly displays heart rate of the underlying QRS T rhythm 30 bpm for the specified waveform d For atrial ventricular pacemaker pulses alone with 0 1 and 2 0 ms pulse widths and 2 mV and 700 mV pulse amplitudes the EG05000 correctly displays heart rate of zero bpm Asystole e For atrial ventricular pacemaker pulses with normally paced QRS T with 0 1 and 2 0 ms pulse widths and 2 mV and 700 mV pulse amplitudes the EG05000 correctly displays heart rate of the QRS T rhythm 60 bpm for the specified test waveform f For atrial ventricular pacemaker pulses with ineffectively paced QRS pattern with 0 1 and 2 0 ms pulse widths and 2 mV and 700 mV pulse amplitudes the EG05000 correctly displays heart rate of the underlying QRS T rhythm 30 bpm for the specified test waveform 9 Version 1 09 Medlab GmbH EG05000 User Manual Serial Transmission The host connection to the board is a serial asynchronous communicat
10. d into one byte together with the checksum The checksum for the wave packet is therefore only 4 bits long because the remaining four bits are needed for the wave counter The status and the value blocks use 7 bit checksums There is still enough security because each byte has its own parity bit Transmitted blocks 1 There are three types of regular data packets waveform blocks value blocks and status blocks Beginning of a packet is indicated by the marker OxF8 wave OxF9 and OxFA values and OxFC status Every other transmitted byte has a value of less than OxF8 This allows for easy synchronisation 2 Waveform blocks are transmitted 50 100 150 or 300 times per second as defined by the last Speed command Initial value is 100 sec 3 Status blocks are transmitted once per second 4 Value blocks are transmitted at each detected pulse OxFA marker can be used for a pulse beep and at each detected respiration OxF9 marker 5 The data protocol is self synchronizing e g one cannot loose synchronisation when some bytes are lost during transmission Only one package is lost in that case 6 There is one special package after receiving the command I identify the board sends a string that contains the board s name hardware version info H0 and software version info S01 This string is in ASCII format and is zero terminated The identification block starts with marker OxFD to ea
11. e user is working on the transmitted samples are not scaled but fall into the range of 0 OxF7 8 Bit samples OxF8 to OxFF reserved for commands It is within the responsibility of the user to scale the transmitted samples in a way that the waves displayed on his screen fit to the usual scales used in medicine 0 5 1 2 and 4 cm mV The amplification of the module in the different amplification stages is Stage 1 Stage 2 Stage 3 Stage 4 1mV 32 1mV 64 1mV 128 1mV 256 Standard values for the trace speed are 12 5 mm sec 25 mm sec and 50 mm sec 5 Version 1 09 Medlab GmbH Technical Data Mechanical size Maximum height With respiration option Attachment Weight Operating voltage Power consumption Input Isolation Leakage Amplification Data transmission Filtering Amplifier frequency range Operating modes Lower edge frequency Upper edge frequency QRS detection Respiration detection Pacemaker Output Protocol Connector Version 1 09 EG05000 User Manual 88 mm x 53 mm see page 4 for board drawing 4 layer PCB thickness 1 6 mm 12mm 25mm four M2 5 screws in the corners of the PCB 32g 5 Volt 10 50 mA 250 mW while measuring Defibrillation protected 4000 Volts RMS Better than class CF requirements lt 10 UA Four stages user selectable Four data output rates user selectable 50 Hz 60 Hz or no notch filter 0 05 to 70 Hz Monitoring and di
12. ector for example to make the host system aware of which cable style currently is connected to the EG05000 and to ignore lead off messages that do not exist for the respective cabling system The simplest solution is to have the end user select which cable is connected in a menu entry in the host s user interface Channels that are requested by the host but cannot be measured because of no electrode contact or the respective lead missing in the cable are transmitted as 0x80 neutral line Transmission is done in blocks The basic interface parameters are 115200 baud 1 start bit 8 data bits an even parity bit and one stop bit The first block transmitted will be a status block 11 Version 1 09 Medlab GmbH EG05000 User Manual The default settings after power up are 100 wave blocks per second I II III activated 1cm mV amplification monitoring bandwidth 50 Hz filter active The host can adjust this to his needs by sending commands to the module To keep the traffic on the serial line as low as possible the following protocol has been implemented The reasons for choosing this protocol where as following The wave blocks are to be transmitted quite often up to 300 times per second and sometimes they contain only one channel of information For this single channel one needs at least a block header a counter a checksum and the wave sample value itself To reduce overhead the number of wave samples in package have been packe
13. en parity bit in each transmitted byte 2 a checksum for each block Even parity in this case means that the sum of all bits in one byte including the parity bit is 0 The module can receive commands over its serial interface For example the user can select transmission speed of the wave block set the amplification of the ECG amplifiers and select which channels should be transmitted by the board The transmitted channels that are available with a five lead cable are 1 1 Einthoven Lead Il Einthoven Lead Ill Einthoven Lead aVR Goldberger Lead aVL Goldberger Lead aVF Goldberger Lead C1 one Wilson lead that should be placed on the chest of the patient Respiration curve oe To reduce overhead for the waveform transmission the wave block uses another checksum algorithm as the status and value blocks do The EG05000 works with a three lead a four lead or a five lead cable Only parts of the maximum number of channels can be measured if not all five electrodes are connected see page 7 The board contains a lead off detection that gives information about each single non connected electrode It is not possible for the module to automatically detect which cable is connected since the situation is the same whether for example a three lead cable or a five lead cable with two non attached leads is used It is recommended for the user to use a connection system with coded cables shorted unused pins in the conn
14. installation just copy it to a directory of your choice and run it The software allows selection of transmitted channels sample rate and amplification as well as selecting filters It graphically displays the selected channels Regulatory Considerations The device that has been described in this document is not a final medical product This means that it cannot be used as a standalone unit to use it on patients Therefore the EG05000 has not been and also cannot be CE marked The customer has to undertake the procedure of CE marking with the final product that contains the module However several products on the market have successfully passed this certification The module complies with the following standards as far as applicable EN60601 1 2006 EN60601 1 2 2007 EN60601 1 4 1997 EN60601 2 27 2006 IEC60601 2 27 201 1 ANSI AAMI EC13 2002 ANSI AAMI EC57 1998 During testing and certification of a product also the user manual of the final product needs to be certified The user manual has to contain certain technical data and warnings to the end users We can support customers by supplying material for the manual that has been used during the certification process of Medlab s devices Version 1 09 18 Medlab GmbH EG05000 User Manual History Rev 0 9 InitialRevision Rev 0 91 Adjusted Layout Corrected typographical errors Moved physical units to begin of document Changed table of contents Rev 0 92 Corrected C
15. ion interface operating at 115200 baud 8 data bits an even parity bit and one stop bit Both CMOS and RS232 5 Volt level voltage levels are available The protocol is block oriented Each block also includes a checksum in the transmitted data The RS232 voltage levels are helpful during evaluation of the board which can be done using an ordinary PC and a special software The connection in the customer s final system will typically be done through OV 5V levels which saves electronic components on the host side of the data stream Connector JP1 is compatible with the interface connector on Medlab s EG01010 three channel ECG OEM board Therefore test cables that had been built for this board can also be used for the EG05000 board The EG05000 sends data and receives commands Commands are one byte characters some of them have an additional parameter others just toggle an internal switch in the EG05000 module The neutral line of the ECG is located at 128 0x80 since the module transmits unsigned data For details please see the protocol description on the following pages Version 1 09 10 Medlab GmbH EG05000 User Manual Serial Transmission Protocol The board transmits up to 8 graphical waveforms synchronously a pulse value a respiration value if the optional respiration board is fitted to the base ECG board and several status bytes Transmission is done in blocks The integrity of the blocks is secured by 1 an ev
16. m mV Each amplification stage has double the sensitivity of the previous stage Channel selection 1 8 wave channels can be selected C Parameter 1 byte Each bit in the parameter byte set to 1 stands for a transmitted wave a 0 means that wave is not transmitted 10000000 respiration 01000000 C1 00100000 aVF 00010000 aVL 00001000 aVR 00000100 Ill 00000010 00000001 I Example to receive I aVR and respiration send 0x43 character C 0x89 Filtering of the waveforms for 50 and 60 Hz line frequency gt Parameter 0 1 or 2 0x35 0x30 for example for 50 0 50Hz and 60Hz Filter off 1 50Hz Filter on 2 60 Hz Filter on Version 1 09 16 Medlab GmbH EG05000 User Manual Filtering of the waveforms for EMG interference 15 30Hz E Parameter 0 or 1 0x45 0x30 for example for E0 0 EMG Filter off reset value 1 EMG Filter on Set board to adult mode or neonate pediatric mode N Parameter 0 or 1 Ox4E 0x30 for example for NO 0 board is in adult mode reset value 1 board is in pediatric neonate mode Calibraton mode 1mV rectangle transmitted for 250 samples K output 250 samples of 1mV rectangular waves then go back to normal mode Update electrode configuration Recognizes newly connected electrodes q0 Newly connected electrodes are recognized after this command has been sent to the module Als
17. med Five Lead ECG OEM boar EGOSOO Technical Manual O R3 e R 061048 Ar g Ale cs RZO RTS 9 I08 R11 OOO0O0O0O00QORMT IN NG Copyright Medlab 2013 Version 1 09 Medlab GmbH EG05000 User Manual Medlab GmbH support medlab eu www medlab eu Version 1 09 Medlab GmbH EG05000 User Manual Table of Content Mechanical Dimensions 4 Overview 4 Module Connectors 5 Physical Units of Data 5 Specifications 6 Connector Assignment 7 Compliance with IEC60601 2 27 8 Serial Transmission 10 Software Protocol Description Introduction 11 Packet Description 13 Commands 16 PC Test Program 17 Regulatory Considerations 18 Revisions of this document 19 3 Version 1 09 Medlab GmbH EG05000 User Manual Mechanical Dimensions
18. o any other command except K and I starts a new search for connected electrodes Simulated data outputs useful for testing or exhibitions M Parameter 0 or 1 0 use real input for data transmission reset value 1 use simulated output waves and values Pacemaker detection on or off P Parameter 0 or 1 0 donot detect pacemaker pulses 1 detect pacemaker pulses reset value Set delay of the pulse trigger signal active high 33ms duration I Parameter 0 1 2 or 9 0 Delay of the pulse trigger signal 15ms reset value 1 Delay of the pulse trigger signal 50ms 2 Delay of the pulse trigger signal 100ms 9 The signal triggers in the middle between R waves Identification of the module yl Identify A zero terminated ASCII string is transmitted showing module information The identification block start with marker OxFD the third edition of 60601 2 27 requires different detection ranges for adults and neonates See page 8 QRS detection for details The EG05000 complies with all requirements of the new and the old standard The board powers up in adult mode the firmware is therefore compatible to the older versions that did not have a neonatal mode 17 Version 1 09 Medlab GmbH EG05000 User Manual Test Program A Microsoft Windows program Monitor exe is available upon request The program does not need any
19. onnector JP1 Layout Added two status messages Corrected packet markers OxFa OxF9 Added description of cable selection electrode detection page 11 Added technical data required for testing against IEC60601 2 27 Rev 1 00 Added brief description of the test program Rev 1 01 Removed reference to EG01010 and protocol switching on power up Exchanged the word packet with block Corrected grammatical errors Added outputs to technical data page Rev 1 02 Corrected JP1 description Added Marker description for Identify block Corrected description of EKGStat byte in status block Rev 1 03 Added JP1 pulse trigger and shutdown pin clarification Packet markers OxFA and OxF9 are exchanged again Changed company address Rev 1 04 Added command description Fx Px Tx Rev 1 05 Corrected typographical errors Rev 1 06 Changed manufacturer address Rev 1 07 Changed pulse range and averaging to 12 beats Rev 1 08 Added neonatal mode because of 10ms R wave suppression requirements Rev 1 09 Added explanation for checksum generation corrected mentioned size of status block 19 Version 1 09 Medlab medizinische Diagnoseger te GmbH Helmholtzstrasse 1 76297 Stutensee Karlsruhe Germany Tel 49 0 7244 741100 oemsales medlab gmbh de www medlab gmbh de
20. se decoding Example for answer to identify command lt 0xFD gt EG05000H0S01 lt 0x00 gt On the next page the structure of the blocks are described Version 1 09 12 Medlab GmbH EG05000 User Manual A waveform block contains between three and 10 bytes Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0 Byte 2 Bit 3 Bit 2 Bit 1 Bit 0 Bit3 Bit2 Bit1 Bito Ctr Chk Ctr Ctr Cir Ctr Chksum Chksum Chksum Chksum Byte 3 Bit 7 Bit 6 Bit 5 Bit 4 Bit3 Bit2 Bit1 BitO Wave 1 Wave 1 Wave 1 Wave 1 Wave 1 Wave 1 Wave 1 Wave 1 Wave 1 Byte 4 Bit 7 Bit 6 Bit 5 Bit 4 Bit3 Bit2 Bit1 BitO Wave 2 Wave 2 Wave 2 Wave 2 Wave 2 Wave 2 Wave 2 Wave 2 Wave 2 Byte 5 Bit 7 Bit 6 Bit 5 Bit 4 Bit3 Bit2 Bit1 BitO Wave 3 Wave 3 Wave 3 Wave 3 Wave 3 Wave 3 Wave 3 Wave 3 Wave 3 Byte 6 Bit 7 Bit 6 Bit 5 Bit 4 Bit3 Bit2 Bit1 BitO Wave 4 Wave 4 Wave 4 Wave 4 Wave 4 Wave 4 Wave 4 Wave 4 Wave 4 2 Ctr bytes are transmitted in this block Ctr is the number of wave samples in the block The checksum is the sum of all bytes in the block with byte 2 the chksum itself ignored for the sum It includes the sync character byte 1 Since only 4 bits can be used the result is anded with 0x0F The wave samples are limited to a number of OxF7 so no mix up with sync bytes can occur The channels are not mapped to a byte position in the block since the user can freely enable disable the channels independently of each other The transmission sequence is always
21. um Byte 3 Electrode Respwav LL Byte 4 Channels Byte 5 Bit 1 Bit 0 EMG Bit 1 Bit 0 Bit 1 Bit 0 EKGStat Filter 2 Filter 2 Filter1 Amp Amp Speed Speed Byte 6 Bit 0 Status SO 5 bytes are transmitted in this block X means the bit is unused and undefined The checksum is the sum of all bytes in the block with byte 2 the chksum itself ignored for the sum It includes the sync character byte 1 Since only 7 bits are used the result is anded with Ox7F Electrodes Byte 3 a 1 in the respective bit position 0 4 means this electrode is connected Respwav 1 respiratory waveform sample is transmitted 0 respiratory waveform sample is not transmitted Channels Byte 4 a 1 in the respective bit position 0 6 means this wave is transmitted EKG Status Byte 5 Speed 00 50 wave blocks per second 01 100 wave blocks per second 10 150 wave blocks per second 11 300 wave blocks per second Amp 00 Amplification stage 1 lowest 01 Amplification stage 2 10 Amplification stage 3 11 Amplification stage 4 highest Version 1 09 14 Medlab GmbH Status Byte 6 Filter1 Filter2 S0 3 S0 3 S0 3 S0 3 S0 3 S0 3 Rest 0000 0001 0100 0101 1000 1010 EG05000 User Manual 0 EMG filter off 1 EMG filter on 00 50 60 Hz filter off 01 50 Hz filter on 10 60 Hz filter on Adultmode Neonatal mode Normal oper
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