EG12000 - Medlab GmbH
Contents
1. O JP C23029 C1105 13 Et TP7 DATE J AL C19 C26 25 C FO r a Es a 5 MULL Opn TPS a E Y a Oz cg TTT JP3 R43 Cc1al 7 R13 i D R17 C22 Sn N OOO olo K Bele alo oll R12 R11 BOOOO000000 F FR Mechanical drawing top view of the module DXF data available upon request Overview The EG12000 is a twelve channel ECG module The module can work with a ten lead cable to show 12 channels with a five lead cable showing 7 channels with a four lead cable showing 6 channels and with a three lead cable to show one channel of ECG The board includes a fulltype CF patient isolation and is powered by a single 5 V DC supply consuming less than 250 mW The limb leads see page 5 for definition are defibrillation protected For the remaining Wilson leads the defibrillation protection has to be integrated into the ECG cable It is possible to measure the respi2. EL Q me Or OO c23020 C1108 TP7 b Poe ee C19 C26 S25 C TPL a H D Patient Limb Lead Connector defib proofed 5 z TPB ST CSC TANT cia S22 Host amp Power kig Connector c22 SJ K rral 7 C44 2 R12 R1 5I3 JP2 1 2000000000 O non Connector Respiration Board Cable Shield Jumper R20 EI 0C0C00000C0 Description of connectors and areas of the module Physical Units of Transmitted Data Scaling of ECGs is done in the unit cm mV for the Y axis and in mm sec for the X axis This is a holdover from the times when ECGs had been recorded on paper strips Respiration rate is transmitted in respirations per minute rpm Pulse rate is transmitted in beats per minute bpm Transmission speed for the wave is indicated in Hz sec 1 ECG amplitudes are normally indicated in cm mV Since this is directly depending on the resolution of the screen the user is working on the transmitted samples are not scaled but fall i
3. Medlab GmbH EG12000User Manual Amp 00 Amplification stage 1 lowest 01 Amplification stage2 10 Amplification stage3 11 Amplification stage 4 highest Filter1 0 EMG filter off 1 EMG filter on Filter2 00 50 60 Hz filter off 01 50 Hz filter on 10 60 Hz filter on Status Byte 6 N 0 Adult mode 1 Neonatalmode K1 State of the digital input K1 K2 State of the digital input K2 S0 3 0000 Normaloperation S0 3 0001 Normal operation pacemakerdetected S0 3 0100 Initalizing S0 3 0101 Searching for electrodes S0 3 1000 Simulated output S0 3 1010 Selftest error Rest Notused but reserved Selftest error 10 errors are fatal The module will never go into measuring state Status message willbetransmittedas long as simulated dataistransmitted Chest status blocks contain four bytes Bit 0 Byte 2 Bit 6 Bit5 Bit 4 Bit3 Bit2 Bit1 BitO Chksum Chksum Chksum Chksum Chksum Chksum Chksum Chksum Byte 3 Electrode C4 C2 Byte 4 Channels C2 Electrode Byte 3 1 in the respective bit position 0 4 means this electrode is connected Channels Byte 4 1 in the respective bit position 0 4 means this waveform is transmitted 19 Version 1 05 EG12000User Manual MedlabGmbH Commands 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 E
4. 1 5 wave channels can be selected D Parameter 1 byte Each bit in the parameter byte setto 1 stands fora transmitted wave a 0 means that the wave will not be transmitted 00010000 C6 00001000 C5 00000100 C4 00000010 C3 00000001 C2 Version1 05 20 Medlab GmbH EG12000User Manual Filtering of the waveforms for 50 and 60 Hz line frequency 5 Parameter 0 1 or 2 0x35 0x30 for example for 50 0 50 Hz and 60 Hz Filter off 1 50 Hz Filter on 2 60 Hz Filter on Filtering of the waveforms for EMG interference 15 30 Hz E Parameter O 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 isin 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 Also 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 usereal input for data transmission
5. 06 2013 23 Version 1 05 Medlab medizinische Diagnoseger te GmbH Helmholtzstrasse 1 76297 Stutensee Karlsruhe Germany Tel 49 0 7244 741100 support medlab eu www medlab eu
6. usage of a high baud rate is necessary because in case all channels are selected a large amount of data is transmitted per second The default settings after power up are 100 wave blocks per second I Il Ill activated 1cm mV amplification monitoring bandwidth 0 66 Hz lower edge frequency 50 Hz filter active The host can adjust this to his needs by sending commands to the module To keep traffic on the serial line as low as possible the following protocol has been implemented The reasons for choosing this protocol were as following Version1 05 14 Medlab GmbH EG12000User Manual Especially the wave blocks are to be transmitted quite often up to 300 times per second and contain only one channel of real information sometimes Forthis single channel one needs at least a block header a counter a checksum and the wave sample To reduce overhead the number of waves has been packed into one byte together with the checksum Thus the checksum for the wave packet can only be 4 bits long because four bits are needed for the wave counter The status and the value blocks use 7 bitchecksums This is still a secure transmission because each byte also has its own parity bit Transmitted blocks 1 There are five types of regular data packets limb waveform blocks chest waveform blocks value blocks status blocks and chest status blocks Beginning of a packet is indicated by the marker OxF8 limb waves OxF9 and OxFA values
7. CG amplifier Diagnostic or Monitoring mode F Parameter 0 or 1 0 bandwidth ofthe amplifier DC 80Hz Diagnosticmode mains filter setting 1 bandwidth of the amplifier 0 67 40 Hz Monitoring mode reset value Transmission frequency of the waveform packet S Parameter 0 1 2 or 7 0x53 0x31 for example for S 1 send waveform packets 50 times per second send waveform packets 100 times per second reset value 0 1 2 send waveform packets 150 times per second Z send waveform packets 300 times per second Amplification of the waveforms A Parameter 0 1 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 cm mV Each amplification stage has double the sensitivity of the previous stage see page 7 Channel selection limb leads and respiration curve 1 8 wave channels can be selected C Parameter 1 byte Each bit in the parameter byte setto 1 stands fora transmitted wave a 0 means that the wave will not be transmitted 10000000 respiration 01000000 C1 00100000 aVF 00010000 aVL 00001000 aVR 00000100 Ill 00000010 I 00000001 Example to receive I aVR and respiration send 0x43 character C 0x89 Channel selection chest leads
8. ECG cable shield connected to Iso Ground 1 2 shorted ECG cable shield connected to Shield Driver 2 3 shorted For full EGO5000 compatibility set the jumper to iso ground JP3 Digital Aux Inputs can be used for cable type coding no defibrillation protect 1 K1 Bit Digital input K1 internal pull up 2 K2 Bit Digital input K2 internal pull up 9 Version 1 05 EG12000User Manual MedlabGmbH Three Lead Patient Cable Four Lead Patient Cable Right Leg Shield Right Leg Left Arm a Right Arm Right Arm Left Arm l Right Arm Left Arm LeftLeg Left Leg X Left Leg RI x I Il Il l or Il or Ill I and Il and III and aVL and aVR and aVF c6 Five Lead Patient Cable Ten Lead Patient Cable c5 c4 c3 c2 R Right Leg Right Leg R Left Arm 2 Left Arm 2 4 Right Arm N t R2 Right Arm R2 N g me A S Left Leg eft Leg f C o Chest D5 amp J Chest C1 O I and II and III I and II and III and aVL and aVR and aVF and C a lg and aVR and aVF and ECG cable connection Blue leads not protected against defibrillation use cablewith integratedprotectionon these leads Magenta shows the internal connector coding for auto detection ofthis type of cable ECG Cable Coding In many applications the end user shall b
9. OxFC status OxFE chest waves and OxFF chest status Every other transmitted byte has a value of less than OxF8 Therefore synchronisation is easy 2 Waveform blocks are transmitted 50 100 150 or 300 times per second as defined by the last Speed command Initial value is 100 Hz 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 lose the synchronisation if 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 ease decoding Example for an answer to identify command lt 0xF D gt EG12000H0S0 1 lt 0x00 gt On the next page the structure of the blocks is described 15 Version 1 05 EG12000User Manual MedlabGmbH Limb waveform blocks contain between 3 and 10 bytes Byte 2 Bit 3 Bit 2 Bit 1 Bit O Bit3 Bit2 Bit1 BitO Ctr Chk Ctr Ctr Ctr 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 Wa
10. S pattem with 0 1 and 2 0 ms pulse widths and 2 mV and 700 mV pulse amplitudes the EG1 2000 correctly displays the heart rate of the underlying QRS T rhythm 30 bpm d For atrial ventricular pacemaker pulses alone with 0 1 and 2 0 ms pulse widths and 2 mV and 700 mV amplitude the EG 12000 correctly displays a 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 EG12000 correctly displays the heart rate of the QRS T rhythm 60 bpm f For atrial ventricular pacemaker pulses with ineffectively paced QRS pattem with 0 1 and 2 0 ms pulse widths and 2 mV and 700 mV pulse amplitudes the EG0 5000 correctly displays the heart rate of the underlying QRS T rhythm 30 bpm With over and undershoot a For single ventricular only pacemaker pulses alone with 0 1 and 2 0 ms pulse widths and 2 mV and 700 mV pulse amplitudes the EG12000 correctly displays a 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 EG1 2000 correctly displays the heart rate of the QRS T rhythm 60 bpm c For single ventricular only pacemaker pulses with ineffectively paced QRS pattem with 0 1 and 2 0 ms pulse widths and 2 mV and 700 mV pulse amplitudes the EG1 2000 correctly displays the hear
11. annels Regulatory Considerations The device that has been described in this document is not a final medical product That means that it cannot be used as a standalone unit to use it on patients Therefore the EG12000 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 2011 ANSI AAMI EC 13 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 Please also see pages 11 and 12 for data that might be needed to fill in a test report form TRF Version1 05 22 Medlab GmbH EG12000User Manual Revisions Rev 1 0 Initial Revision 30 05 2011 Rev 1 01 Minor graphical changes 06 06 2011 Rev 1 02 JP2 Pin 1 position changed 09 06 2011 Rev 1 03 Shield driver descriptionadded 21 06 2011 Rev 1 04 Changed manufacturer address 11 05 2012 Corrected typos 09 11 2012 Rev 1 05 Added neonatal mode 05
12. be placed to right and left shoulder and right and left hip instead without changing the ECG trace shape Chest Leads The six cable leads that are attached to the chest of the patient 1 11 I Theclassical Einthoven ECG chanrels aVR aVL aVF Theaugmented Goldberger channels C1 C2 C3 C4 C5 C6 The Wilson channels measured over the chest leads Sometimes also referred to as V1 V6 Due to the definition of the chest leads itis not possible to measure these channels without also having the limb leads attached to the patient Three lead ECG cable A cable that is attached to the patient using three electrodes One channel can be measured either Einthoven Il or Ill depending on electrode placement Four lead ECG cable A cable that is attached to the patient s limbs using four electrodes Six channels can be measured but four of them contain redundant information These channels are Il Ill and the Goldberger channels Five lead ECG cable A cable that is attached to the patient using five electrodes Seven channels can be measured but four of them contain redundant information The additional channel when comparing with the four lead cable is typically placed into one of the Wilson electrode positions It is possible to record I Il Ill aVR aVL aVF and one channel 5 Version 1 05 EG12000User Manual MedlabGmbH Ten lead ECG cable By using a ten lead cable sometimes also referred to as a 12
13. c Range 5 mV AC 300 mV DC Defibrillator Discharge Recovery lt 10 sec per IEC 601 2 27 lt 10 secperAAMI EC13 1992 Leads off sensing current Applied currentsless than 150 nA The following information references particular sections of IEC EN 6060 1 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 EG12000 is set to adult mode the heart rate meter will notrespond 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 EG12000 is setto neonate mode the detection range of QRS amplitude is 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 EG12000 counts both large and small QRS complexes to display a rate of 80 bpm A2 Slow alternating ventricular bigeminy the EG12000 counts both large andsmallQRS complexes to display a rate of 60 bpm A3 Rapid altemating ventricular b
14. cables that had been built for this board can be used also for the EG12000 board The EG12000 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 module The neutral line ofthe ECG always lies around 128 as the module transmits unsigned data The protocol is a superset of the EG05000 protocol compared to this there are two additional blocks the chest lead wave block and the chest lead status block A few commands exist that are not present in the EG05000 For details please see the protocol description on the following pages 13 Version 1 05 EG12000User Manual MedlabGmbH Serial Protocol The board transmits up to 12 13 with respiration curve 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 even 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 ofthe ECG amplifiers and select which channels should be transmitted by the board To reduce overhead for the wa
15. e option Asynchronous serial output with CMOS levels 0 5 V Hardware pulse trigger output CMOS levels 0 5 V Both outputs fully isolated from patient Standard bidirectional serial protocol 115200 Baud Connectors compatible to Medlab EG05000 five channel ECG OEM board Limb leads and C1 lead defibrillation protected Chest leads C2 C6 not defibrillation protected ECG cable shielded with isolated ground or with shield driver jumper selectable Version1 05 Medlab GmbH EG12000User Manual Connectors Header for host connection JP6 Ground Ground Txd RS232 level 5Volt Txd TTL level Rxd RS232 level 5Volt Rxd TTL level Not connected Not connected Not connected 10 Notconnected 11 Pulse Trigger output 12 Pulse Trigger output 13 Shutdown 14 Shutdown VCC level on this pin powers down module 15 VCC input 16 VCC input OON O O1 ND gt Header for patient cable connection JP1 Chest leads not defibrillation protected 1 C6 IN C6 input 2 C5 IN C5 input 3 C4 IN C4 input 4 C3 IN C3 input 5 C2 IN C2 input JP2 Limb leads amp C1 defibrillation protected 1 C1 IN C1 input 2 ISOGND Isolated ground 3 LL IN Left leg input 4 RA IN Right Arm input 5 LA IN Left arm input 6 SHIELD ECG cable shield Isolated ground or driven shield 7 RL IN Right leg input The shielding of the ECG cable can be connected tothe isolated ground or to a shield driver by setting J1 accordingly
16. e able to connect either a three four five or ten channel cable to the same connector of the final medical device In order not to show false lead off messages the host needs to know which cable is currently connected There are two possibilities The user can connect two of the unused Cx pins in the three four or five lead cable to isolated ground in the respective ECG connector and the board will recognize this coding as eplained inthe above drawing No extra pins inthe connector are needed for this type of coding Alternatively the system can use two spare digital inputs K1 and K2 to code the connected cable In the connector of the ECG cable there can be bridges that are connecting K1 and K2 to isolated ground or leave them open The two bits K1 and K2 are transmitted unchanged in the protocol ofthe module The user is free to assign the different coding to the respective cable The connector needs two extra pins By using one or the other method four cables can be coded and therefore three four five and ten lead cables can be distinguished from each other Version1 05 10 Medlab GmbH EG12000User Manual Technical Description for TRF IEC 60601 2 27 When preparing a test report form TRF for proof of compliance of a medical product to IEC6060 1 2 27 2005 the following remarks technical data will be helpful or needed Inputimpedance gt 10 MOhm Common mode rejection ratio gt 90 dB at 50 Hz or 60 Hz Input Dynami
17. igeminy the EG12000 counts all QRS complexes to display a rate of 120 bpm A4 Bi directional systoles the EG12000 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 11 Version 1 05 EG12000User Manual MedlabGmbH Time to alarm for tachycardia Section 6 8 2 bb 6 WaveformB1 Amplitude Time to alarm 0 5mV 1 sec 1mV 1 sec 2mV 1sec WaveformB2 Amplitude time to alarm 1mV 1sec 2mV 1 sec 4mV 1 sec Pace maker pulse display capability See IEC 601 2 27 clause 50 102 12 The EG12000 is capable of displaying the ECG signal in the presence of pacemakerpulses 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 Pace maker 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 2 mV and 700 mV amplitudes the EG12000 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 EG1 2000 correctly displays the heart rate of the QRS T rhythm 60 bpm for the specified test waveform c For single ventricular only pacemaker pulses with ineffectively paced QR
18. lead cable although 12 channels is meant one can measure the 6 channels that a fourlead cable delivers plus the Wilson channels C1 C6 Four electrodes are placed on the limbs of the patient six electrodes on the chest Electrodes Best results are obtained if the ECG is connected to the patient using disposable self sticking pre geled electrodes Many different brands are available on the market If the aluminium bag they are in has been opened these electrodes tend to dry out and become unusable within two to three weeks Colour Coding The clamps of the ECG cable that are attached to the electrodes are colour coded to ease connection for medical personnel There are two definitions for these colours AHA colours used in the USA and Canada and IEC colours used in all other countries ponam fra rn Tune karten ja fee fe o Host The system where the ECG board is connected to containing a microcontroller or an embedded PC receiving data from the ECG board and sending commands to the board Protocol Format of the data blocks that are sent from the EG 12000 to the host Commands One or two byte blocks that transfer commands of the host to the EG12000 Version1 05 6 Medlab GmbH EG12000User Manual Module Connectors Patient Chest Lead Connector Respiration Board Connector 2 Bit Digital Aux Fe not defib proofed Input Connector N JP ei mO00000C BICC OO JP3 ICT
19. med Twelve Lead ECG OEM board EG12000 Technical Manual TOO mojorojo a _ SES 8 so o L AL AL AL AL a E ea E a o 0 IK SE 2 OK i 3 o J oO o 00 o ll all OOOOOOOONOO Goo Copyright Medlab 2013 Version 1 05 EG12000User Manual MedlabGmbH Version1 05 2 Medlab GmbH EG12000User Manual Table of Content Mechanical Dimensions 4 Overview 4 Definition of Terms 5 Module Connectors 7 Physical Units of Transmitted Data 7 Technical Data 8 Connectors 9 ECG Cable Coding 10 Compliance with IEC60601 2 27 11 Serial Transmission 14 Software Protocol Description 14 Introduction 14 PacketDescription 16 Commands 20 PC Test Program 21 Regulatory Considerations 22 Revisions of this document 23 3 Version 1 05 EG12000User Manual MedlabGmbH Mechanical Dimensions 33 1 18 5 JP1 mOOOGCOCO MOOOC S Ors TES Rza
20. nto the range of 0 0xF7 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 onto 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 1mV 32 1mV 64 1mV 128 1mV 256 Typical values for the trace speed are 12 5 mm sec 25 mm sec and 50 mm sec Version 1 05 EG12000User Manual Technical Data Mechanical data Maximum height With respiration option Attachment Weight Operating voltage Powerconsumption Input Isolation Leakage current Amplification Datatransmission Filtering Amplifier frequency range Pulse detection Respiration detection Output Protocol Connector Defib Protection Shielding MedlabGmbH 88 mm x 53 mm see page 4 for board drawing DXF data available upon request 4 layer PCB thickness 1 6 mm 12 mm 25 mm four M2 5 screws in the corners ofthe PCB 32g 5 Volt 5 50 mA 250 mW while measuring Defibrillation protected 4000 Volts RMS Better than type CF requirements 10 pA Four levels user selectable Four frequencies user selectable 50 Hz or 60 Hz notch filter included 0 05 to 70 Hz Adjustable lower edge frequency 0 05 or 0 66 Hz 30 250 bpm 1 1 Digit 12 beat average 5 99 rpm 3 1 Digit 8 samples averag
21. ration rate of the patient using the impedance change between the limb electrodes Forthis the optional respiration board has to be attached to the module When using a ten lead cable the module can output the following channels synchronously I Il III aVR aVL aVF C1 C2 C3 C4 C5 C6 When using a five lead cable the module can output the following channels synchronously Il Ill aVR aVL aVF Cx x depending on electrode placement When using a four lead cable the module can output the following channels synchronously I II Ill aVR aVL aVF When using a three lead cable the module can output the following channels or II or Ill depending on electrode placement Version1 05 4 Medlab GmbH EG12000User Manual Definition of Terms Leads The number of wires attached to the patient to his arms legs and chest Normally the term lead is also often used for channels which is not fully correct It is for example possible to measure 12 channels with 10 leads but only one channel can be measured with three leads attached Channels The different ECG curves that can be measured and displayed Since the definition of some ofthe dlassical ECG channels is redundant when compared to others more channels than leads can exist Limb Leads The four cable leads that are attached to electrodes which are positioned on the patient s right arm left arm right leg and left leg To improve signal quality they can
22. resetvalue 1 use simulated output waves and values Pacemaker detection on or off P Parameter 0 or 1 0 do notdetect pacemaker pulses 1 detect pacemaker pulses reset value Set delay of the pulse trigger signal active high 33 ms duration T Parameter 0 1 2 or 9 0 Delay of the pulse trigger signal 15 ms reset value 1 Delay of the pulse trigger signal 50 ms 2 Delay of the pulse trigger signal 100 ms 9 The signal triggers in the middle between R waves Identification of the module l Identify Azero teminated ASCII string is transmitted showing module information The identification block start with marker OxFD the third edition of 6060 1 2 27 requires different detection ranges for adults and neonates See page 11 QRS detection for details The EG12000 complies with all requirements ofthe new and the old standard The board powers up in adult mode the firmware is therefore compatible to the older versions that did nothave a neonatal mode 21 Version 1 05 EG12000User Manual MedlabGmbH Test Program A Microsoft Windows program Monitor exe is available upon request The program does not need any installation just copy it to a directory of your choice and run it The software allows the selection of transmitted channels sample rate and amplification as well as selecting filters It graphically displays the selected ch
23. t 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 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 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 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 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 including the sync character modulo 16 The wave samples are limited to anumber of OxF7 so no mix up with sync bytes can occur The channels are not mapped one to one to the byte position in the block since the user can freely enable disable all channels independently The transmission sequence is always C2 C3 C4 C5 C6 Example 1 the host requests C3 C4 and C5 to be transmitted Wave 1 will be C3 Wave 2 will be C4 and Wave 3 will be C5 the block being 5 bytes long Value blocks contain three bytes Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0 Byte 2 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0 Chksum Chksum Chksum Chksum Chksum Chksum Chksum Chksum Byte 3 Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit O Value Value Value Value Value Value Value Value Value 17 Version 1 05 EG12000User Manual MedlabGmbH 3 bytes are transmitted in
24. t rate of the underlying QRS T rhythm 30 bpm d For atrial ventricular pacemaker pulses alone with 0 1 and 2 0 ms pulse widths and 2 mV and 700 mV amplitudes the EG12000 correctly displays the heart rate ofzero 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 EG12000 correctly displays the heart rate of the QRS T rhythm 60 bpm f For atrial ventricular pacemaker pulses with ineffectively paced QRS pattem with 0 1 and 2 0 ms pulse widths and 2 mV and 700 mV pulse amplitudes the EG0 5000 correctly displays the heart rate of the underlying QRS T rhythm 30 bpm Version1 05 12 Medlab GmbH EG12000User Manual Serial Transmission The normal connection to the board is done via serial asynchronous communication 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 has a checksum within the transmitted data The RS232 voltage levels are helpful during evaluation ofthe board which can be done using an ordinary PC and a special software The connection in the customer s final system could be done through OV 5V levels which saves parts on the customer s side of the data stream Connector JP6 is compatible with the interface connector on Medlab s EG05000 five channel ECG OEM board Therefore test
25. this block Type 00 gt not used Type 10 gt respiration value Type 01 gt pulse value Type 11 gt not used butreserved for future extensions The checksum is the sum of all bytes in the block including the sync character modulo 128 The values are limited toa number of OxF7 so no mix up with syncbytes can occur Status blocks contain five bytes Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0 Byte 1 Sync 4 4 4 4 1 0 Byte 2 Bit 6 Bit5 Bit 4 Bit3 Bit2 Bit1 BitO Chksum Chksum Chksum Chksun Chksum Chksum Chksum Chksum Byte 3 Electrode Respwav x Chest RA LA LL Byte 4 Channels C1 aVF aVL aVR Byte 5 Bit 1 Bit 0 EMG Bit 1 Bit 0 EKGStat Filter 2 Filter 2 Filter1 Amp Speed Byte 6 Bit 3 Bit 2 Bit 1 Bit O Status 0 N K2 K1 S3 S2 S1 So 5 bytes are transmitted in this block X means the bit is unused and undefined The checksum is the sum ofall bytes in the block including the sync character modulo 128 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 Version1 05 18
26. ve 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 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 nu mber of wave samples in the block The checksum is the sum of all bytes in the block including the sync character modulo 16 The wave samples are limited to a number of OxF7 so no mix up with sync bytes can occur The channels are not mapped one to one tothe byte position in the block since the user can freely enable disable the channels independently The transmission sequence is always I Il Ill aVR aVL aVF C1 Respiration Example 1 the host requests l a VF and C1 tobetransmitted Wave 1 will be l Wave 2 will be aVF and Wave 3 willbe C1 the block being 5 bytes long Example 2 the hostrequests C1 and respiration waveform to be transmitted Wave 1will be C1 Wave 2 will be respiration waveform the block being 4 bytes long Version1 05 16 Medlab GmbH EG12000User Manual Chest waveform blocks contain between 3 and 7 bytes Bit7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0 Bit 3 Bit 2 Bit 1 Bit 0 Bit3 Bit2 Bit1 BitO Ctr Ctr Ctr Ctr Chksum Chksum Chksum Chksum Bi
27. veform transmission the wave block uses another checksum algorithm as the status and value blocks do The EG12000 works with a three lead a four lead a five lead or a ten lead cable Only parts of the maximum number of channels can be measured if not all the electrodes are connected see page 10 The board contains a lead off detection that gives information about each single non connected electrode It is not possible for the module to detect automatically 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 electrodes is used It is recommended for the user to use a connection system with coded cables shorted unused pins in the connector for example to make the host system aware of which cable currently is connected to the EG12000 and to ignore lead off messages that do not exist for the respective cabling system Inputs K1 and K2 can be used for this purpose A simpler but less comfortable solution is to have the end user select which cable is connected in amenu in the host 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 neutralline Transmission is done in blocks The basic interface parameters are 115200 baud 1 start bit 8 data bits even parity bit and one stop bit The first block transmitted will be a status block The
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