Control Module in Addressable Fire Alarm System | Integration | CRF300,ULMCOM,MI-DCMO | English Sub

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  • Опубликовано: 21 авг 2024

Комментарии • 341

  • @kareemabdul6760
    @kareemabdul6760 3 года назад +5

    Highly Appreciated work,
    Regarding: As seen in Video it been place above ceiling; do we need to recommend civil for access panel?
    Do modules required more maintenance?
    Another doubt..
    If the fire occur in ground floor and signal sense at Main panel, do it give intergration to all access to be open including above floors
    Or the area surrounding ground floor..

    • @Ansari29
      @Ansari29  3 года назад +1

      We have install cm mm above false ceiling & output cable give to access panel through cable tray. Basically we install near to integrate panel.
      2. No need for maintenance of CM MM, only when it's get faulty or signal not getting properly.
      3. You can connect single cable to multiple panel by looping. So that all doors get open in single fire knock.

    • @kareemabdul6760
      @kareemabdul6760 3 года назад +1

      @@Ansari29 thanks for the beautiful information
      Hope for more similar details in future.

    • @Ansari29
      @Ansari29  3 года назад

      Thanks for your comment 🙂

    • @rehanzahid7591
      @rehanzahid7591 3 года назад +1

      Pls make a video on voltage drop calculation method for NAC circuit in fire alarm system

    • @salvorandy4796
      @salvorandy4796 Год назад

      What happen if relay module not blinking?how to troubleshoot

  • @sanusantra7036
    @sanusantra7036 3 года назад +1

    Sir bohot bohot faida hua is video se.thank you

    • @Ansari29
      @Ansari29  3 года назад

      Pls mery video ko apki company k group m share kijiye

  • @ahmed-sharkawy
    @ahmed-sharkawy Год назад +1

    Thank you very much, from Egypt💯

  • @sunilmadane4973
    @sunilmadane4973 2 года назад +1

    I'm watching your video passout interview thanks sir ❤️

    • @Ansari29
      @Ansari29  2 года назад +1

      Great, pls share my videos in your company group.

  • @muhammadahmad9760
    @muhammadahmad9760 3 года назад +2

    Man ive just start watching you videos and they are very informative even for thw commoner or who are on supervisory or managerial posts.
    Your way of explanation is very appriciatable please keep up the good work.
    If possible do suggest some books or vidoe material for more and better undersatnding towards fixed fire installtion.
    Once again thanks for the effort you are making to aware people un same indistry.

    • @Ansari29
      @Ansari29  3 года назад

      Thanks Ahmed for your motivational comment.

    • @Ansari29
      @Ansari29  3 года назад

      Actually in our industry there is no any book available, you can just refer NFPA guidelines but to getting idea of the different different panel you have to work on this then only you will get the knowledge. That's why I am making such kind of video.
      Request you to please share my videos in your company group

  • @mithilrao3835
    @mithilrao3835 Год назад +1

    Sir, ye sab to sahi hai, sab kuch method known and understood hai, but different make k module k connection bhi to batao

    • @Ansari29
      @Ansari29  Год назад

      Which make module...??

  • @mdzabi3867
    @mdzabi3867 6 месяцев назад +1

    Excellent explanation Bhai..

    • @Ansari29
      @Ansari29  5 месяцев назад

      Thank you so much 😀

  • @mohammedsajeedahmed5047
    @mohammedsajeedahmed5047 8 месяцев назад +1

    Thanks for this video

    • @Ansari29
      @Ansari29  7 месяцев назад

      Most welcome

  • @shahidshaikh-ph4vk
    @shahidshaikh-ph4vk Год назад

    Lajawaab ❤️

  • @rays8091
    @rays8091 Год назад +1

    Nice info... With sub title 👍👍👍

    • @Ansari29
      @Ansari29  Год назад

      Thanks, pls share my video in your company group

  • @tanveerhaider9257
    @tanveerhaider9257 8 месяцев назад +1

    zabardast

  • @abdulzoha5972
    @abdulzoha5972 3 года назад +1

    Great ansari ji

    • @Ansari29
      @Ansari29  3 года назад

      Thanks for your comment 😊

  • @safetyandsecurityknowledge2307
    @safetyandsecurityknowledge2307 2 года назад +1

    Very helpful information sir ji

    • @Ansari29
      @Ansari29  2 года назад

      Thanks, pls share my videos in your company group

  • @hrehman105
    @hrehman105 7 месяцев назад +1

    Good 👍

    • @Ansari29
      @Ansari29  7 месяцев назад

      Thank you! Cheers!

  • @junaidsiddiqui2748
    @junaidsiddiqui2748 2 года назад +1

    Assalamu alaikum Bhai good example Bhai mai douse fire company me Mai ne aap ke baare me pata Kiya

    • @Ansari29
      @Ansari29  2 года назад

      Thanks for your comment 😊
      Pls share my videos in your company group

  • @TanweerAhmed
    @TanweerAhmed 3 года назад +2

    Good and informative video👍

    • @Ansari29
      @Ansari29  3 года назад +1

      Thanks for your comment sir🙂

  • @technicalgholam9506
    @technicalgholam9506 2 года назад +1

    Very good explanation

    • @Ansari29
      @Ansari29  2 года назад

      Thanks, pls share my videos in your company group

  • @jaykishorkumar7820
    @jaykishorkumar7820 2 месяца назад +1

    Thanq sir

    • @Ansari29
      @Ansari29  Месяц назад

      Most welcome, pls share my videos in your company groups

  • @geet5798
    @geet5798 3 года назад +1

    Thank you
    It was very helpful 🙂

    • @Ansari29
      @Ansari29  3 года назад

      Thanks for your comment 😊

  • @CloudNine224
    @CloudNine224 3 года назад +1

    Nice video. Keep doing

    • @Ansari29
      @Ansari29  3 года назад

      Thanks for your comment 😊

  • @prajapatipragnesh3504
    @prajapatipragnesh3504 2 года назад +1

    honeywell relay module me 2 relay output hote he. usme 24 volt dc nahi dena padta aur control module me 24V dc external power dena padta he.

    • @Ansari29
      @Ansari29  2 года назад

      24 V DC for external hooter

  • @WMirza79
    @WMirza79 2 года назад +1

    Very informative
    Can you please make a video for testing fire alarm system,
    And a detailed video for troubleshooting fire alarm system (such as open ground, missing device, trouble etc.)
    Thank you for your support

    • @Ansari29
      @Ansari29  2 года назад +1

      I have upload same video. Pls check in my videos list.

  • @vaibhavhcst
    @vaibhavhcst Год назад +1

    👌 keep it up

  • @sanusantra7036
    @sanusantra7036 3 года назад

    Aise video banate rahiye

    • @Ansari29
      @Ansari29  3 года назад

      Thanks for your comment 😊

  • @tabrejamdari4747
    @tabrejamdari4747 6 месяцев назад

    Good ansari sir ji

    • @Ansari29
      @Ansari29  6 месяцев назад

      Thanks you

  • @tanveerhaider9257
    @tanveerhaider9257 9 дней назад

    Ansari bhai please 1 video IFU ki input/output pe bna den kis system ko input deni h kis ko output.

  • @salimansari4102
    @salimansari4102 3 года назад +1

    Nice explanation sir ji👍

    • @Ansari29
      @Ansari29  3 года назад

      Thanks for your comment 🙂

  • @zubairalam1669
    @zubairalam1669 3 года назад +1

    Nice

    • @Ansari29
      @Ansari29  3 года назад

      Thanks for your comment 😊
      Pls share my videos in your company group

  • @zubairalam1669
    @zubairalam1669 2 года назад +1

    Thanks sr

  • @MerajKhan-pk9hq
    @MerajKhan-pk9hq 3 года назад +1

    Bhut achcha video hai

  • @basrawwibasra1745
    @basrawwibasra1745 Год назад

    Jazak allah khair Bro..❤

  • @arifgani5326
    @arifgani5326 3 года назад +2

    Please make more videos related to it thanks brother

    • @Ansari29
      @Ansari29  3 года назад

      Thanks for your comment 😊

  • @mak4920
    @mak4920 3 года назад

    Nice explanation ....very usefull for me.

    • @Ansari29
      @Ansari29  3 года назад

      Thanks for your comment 😊
      Pls share my videos in your company group

  • @gufran_raza2365
    @gufran_raza2365 3 года назад +1

    Excellent sir ,,👍👍👍

    • @Ansari29
      @Ansari29  3 года назад

      Thanks Gufran

    • @Ansari29
      @Ansari29  3 года назад

      Pls share my videos in your company group

  • @AyanKhan-iv7kw
    @AyanKhan-iv7kw 3 года назад +1

    Outstanding sir G ❤️

    • @Ansari29
      @Ansari29  3 года назад

      Thanks for your comment 😊

    • @Ansari29
      @Ansari29  3 года назад

      Pls share my videos in your company group

  • @mohamedkamil4224
    @mohamedkamil4224 3 года назад +1

    Hello brother,nice video your way of explanation is really nice and its very easy to understand and gain knowledge about firealarm system
    We want videos about device connections calculation of slc ciecuit per loop

    • @Ansari29
      @Ansari29  3 года назад

      Thanks for your comment 🙂

    • @Ansari29
      @Ansari29  3 года назад

      Ok i will try to make video on said topic

  • @mirazkhan5044
    @mirazkhan5044 2 года назад +1

    sir iam from bangladesh.I like your videos. please make a videos how to intregrate exhaust fan with fire detection systems

    • @Ansari29
      @Ansari29  2 года назад

      Use CM to integrate it....
      Thanks for your comment
      Pls share my videos in your company group.

  • @rohanmalhotra5480
    @rohanmalhotra5480 3 года назад +2

    Awesome Video sir...can u explain how Adressable Fire Alarm Panel's zone integrate with Building Management system ?

    • @Ansari29
      @Ansari29  3 года назад

      Thanks for your comment 😊
      My next video on said topic, please subscribe & press bell icon you will get the notification

  • @lijochathelijacob7766
    @lijochathelijacob7766 2 года назад +1

    Very informative, even for a novice. Any one new can understand. But the speed at which u speak is difficult to catchup with

    • @Ansari29
      @Ansari29  2 года назад

      Thanks for your comment 😊
      Pls share my videos in your company group

  • @arifgani5326
    @arifgani5326 2 месяца назад +1

    Thanks you boss

  • @noorofficial1
    @noorofficial1 2 года назад +1

    Explanation one video addressable fire alarm pannel with detector and control module, manual call point adressing

    • @Ansari29
      @Ansari29  2 года назад +1

      Pls check my playlist

  • @tanveerhaider9257
    @tanveerhaider9257 9 дней назад

    Ansari bhai hm roller shutter, lift, access control,msfd, Exhaust fan, mcc, DDC, CBs, kitchen ventilation etc system k liay IFU use kar rahy hein

  • @imrankhan-vq1th
    @imrankhan-vq1th 2 года назад +1

    Control module i used in AHU system to trip HVAC

    • @Ansari29
      @Ansari29  2 года назад

      Great,
      Thanks for sharing your experience
      Pls share my videos in your company group

  • @mohammaddawood4016
    @mohammaddawood4016 Год назад

    good

  • @rockysubu8384
    @rockysubu8384 Год назад

    Nicely explained

  • @sarellakumarbabu6357
    @sarellakumarbabu6357 2 года назад +1

    Please distinguish between control module and relay module.

    • @Ansari29
      @Ansari29  2 года назад

      Hi, Already ek video banaya hai, pls check my video playlist

  • @neerajmehta1248
    @neerajmehta1248 3 года назад +1

    Cantrol Modual Ahu or exost or Bgm system k liye use kiya h mene

  • @safderalam570
    @safderalam570 3 года назад +1

    Osm sir ji

    • @Ansari29
      @Ansari29  3 года назад

      Thanks for your comment 🙂

  • @sunderkumar9731
    @sunderkumar9731 2 года назад +1

    Pls make a video on beam detector

    • @Ansari29
      @Ansari29  2 года назад

      Yes, Sure.
      Pls share my videos in your company group

  • @prajapatipragnesh3504
    @prajapatipragnesh3504 2 года назад +1

    honeywell notifier FRM -1 me connection kaise kare. aur hvac system tripping kaise kare?

    • @Ansari29
      @Ansari29  2 года назад

      I will make separate video for it

  • @shiningstar5698
    @shiningstar5698 Год назад

    Make a video on Transmitter and receiver which normally gets used in Warehouses for fire alarm system.

  • @surendersingh7202
    @surendersingh7202 3 года назад +1

    Osm sir but precticaly fire pressurisation fan and jet fan any other equipment and module ke saath video banaye

    • @Ansari29
      @Ansari29  3 года назад

      Thanks for your comment 😊

    • @Ansari29
      @Ansari29  3 года назад

      Ok i will try to make video on said topic 👍

  • @chaudharyshekhartyagi1929
    @chaudharyshekhartyagi1929 2 года назад +1

    Fire alarm panel and AHU integration video bnaayein.

  • @jineshm2521
    @jineshm2521 2 года назад +1

    Please make vedeo 24*7 relay connection detail

    • @Ansari29
      @Ansari29  2 года назад

      What is 24*7...? I didn't get it ..

  • @user-jw2ly2sz1v
    @user-jw2ly2sz1v 3 года назад +1

    Gd

    • @Ansari29
      @Ansari29  3 года назад

      Thanks for your comment 😊

  • @RubelChowdhury-pk7hi
    @RubelChowdhury-pk7hi 13 часов назад

    Please about input and output module make bangla

  • @malikmohsinzamankhan3573
    @malikmohsinzamankhan3573 2 года назад +1

    Can u make a video on addressable to conventional panel and conventional to addressable panel interface...

    • @Ansari29
      @Ansari29  2 года назад

      Which brand panel..?

  • @pooja1757
    @pooja1757 2 года назад +1

    Sir, control monitor of fire fighting system ka bhi btayiye

  • @shafiullahakhtar3353
    @shafiullahakhtar3353 4 месяца назад +1

    Sir FCM& FRM dono ka ek hi kaam hai kya ?
    Sir FCM se hum hooter ko connect kar saktey hai kya?

    • @Ansari29
      @Ansari29  4 месяца назад

      24V supply k through operator hota h

  • @goudprashant7155
    @goudprashant7155 3 года назад +1

    Sir , plz make videos on commissioning and loop testing

    • @Ansari29
      @Ansari29  3 года назад

      Yes Sure prashant

  • @praveenjose3968
    @praveenjose3968 5 месяцев назад

    Pls upload sliding door door connected with fire alarm system

  • @srk.1
    @srk.1 Год назад +1

    Assalamualaikum Shahbaz bhai, Ye air curtain ke magnetic sensor se integrate karsakte? In case of fire alarm Air curtain Off rehna chaiye door open hone ke bad bhi.

  • @hashib.official
    @hashib.official 3 года назад +1

    Sir kabhi ESSER by Honeywell devices par koi video banaye with module

    • @Ansari29
      @Ansari29  3 года назад

      Ok Hasib I will try to make video on said topic

    • @Ansari29
      @Ansari29  3 года назад

      Pls share my videos in your company group

  • @ritwijb
    @ritwijb 2 года назад

    Hello, very nicely explained videos however I need a help from you.How do i connect a pump/fan starter to the fire alarm through a relay module.I am confused cause the pump starter operates on 240 V and our final panel will give a 24V trigger for the relay condition to change, can you guide me on how to connect the starter to the panel ,thanks do much

  • @IzharKhan-mg5ve
    @IzharKhan-mg5ve Год назад +1

    Diesel pump pressure switch with solenoid volve control wiring please

    • @Ansari29
      @Ansari29  Год назад

      Ok, I will check & get back to you

  • @bhaijann2237
    @bhaijann2237 2 года назад +1

    Assalamu walaikum Bhai

  • @sportswouldcup
    @sportswouldcup 2 года назад +1

    Sir drowning se xplane kar ke btaiye Honeywell Morley panel pe

    • @Ansari29
      @Ansari29  2 года назад

      Sure, I wish try

  • @aalimmuhammad3534
    @aalimmuhammad3534 2 года назад

    FCU control box,FCU fire control box,msfd control box , control module wiring diagram

  • @manauwarhussain2721
    @manauwarhussain2721 22 дня назад

    Sir mai Central battary system ko interface kiya hon Siemens panel se XLS 30 panel Interface kar chuka ho our 30baki hai

  • @mdahsanullah5335
    @mdahsanullah5335 3 года назад +1

    Sir fire panel ko reset kaise karte hai live vedio banaiye

    • @Ansari29
      @Ansari29  3 года назад

      Trouble kon sa hai....?

    • @Ansari29
      @Ansari29  3 года назад

      Agar koi trouble hoga toh pehly aapko usko reset karna hoga usky baad hi fire Panel reset hoga

  • @user-xu5ic7ex4v
    @user-xu5ic7ex4v 7 дней назад

    Assalamualaikum Bhai
    Please explain disable, enable,fire history,status, fault total options explain in gent panel

  • @manojkumar-im1mw
    @manojkumar-im1mw 2 года назад +1

    Kitchen hot plate fire panel se pahle ke roop Kaise connect short circuit hone

    • @Ansari29
      @Ansari29  2 года назад

      Nhi samja aapka doubt, thoda clear kijiye...

  • @user-xu5ic7ex4v
    @user-xu5ic7ex4v 7 дней назад

    Assalamualaikum bhai.please explain about gent panel operation

  • @pradhumnsingh7005
    @pradhumnsingh7005 3 года назад

    Inlan fan , exhaust fan

    • @Ansari29
      @Ansari29  3 года назад

      Yes, You can integrate with Fan

  • @dilipkumarkannaujia983
    @dilipkumarkannaujia983 3 года назад +1

    Fire pump ke water flow switch se bhi hota hai

    • @Ansari29
      @Ansari29  3 года назад

      Thanks for sharing info 👍

  • @avramanavakkalagadda4631
    @avramanavakkalagadda4631 Год назад

    control modules power supply given as a same hooter power cable used it is ok

  • @starelectricalworkssalman257
    @starelectricalworkssalman257 Год назад

    I am using beam detector via connect to fire alarm panel

  • @sarfrazkhan1986
    @sarfrazkhan1986 3 года назад +1

    Fire damper kya h iska connection kaise hota h... Vedeo bnaiye

    • @Ansari29
      @Ansari29  3 года назад

      Fire damper critical room m install karty h if in case fire hojati h toh oxygen level ko decrease karny k liye fire damper use kart h.. usko CM k sath connect karty h..

    • @Ansari29
      @Ansari29  3 года назад

      Ok i will try to make video on it

  • @prajapatipragnesh3504
    @prajapatipragnesh3504 2 месяца назад +1

    Notifier FCM1 Control Module bina 24 volt ke chalana he or uska external powers supply ka fault ata he to usko normal kaise kare?

    • @Ansari29
      @Ansari29  Месяц назад

      Aapka doubt ka video upload hony wala hai pls subscribe & press the bell icon for notifications

  • @dil_se_trader
    @dil_se_trader 3 года назад

    👌👌👌

  • @sachinballal
    @sachinballal Год назад +1

    Sir non addressble panel me fire control module use kar sakte hai kya ?

    • @Ansari29
      @Ansari29  Год назад

      As per my experience no

  • @ismailmoyna6496
    @ismailmoyna6496 Год назад +1

    कृपया मेरे लिए फायर कंट्रोल सिम्प्लेक्स 4100es पैनल की फिटिंग का वीडियो बनाएं, कंट्रोल पैनल, विभिन्न उपकरणों और से लूप कैसे निकालें मॉड्यूल जुड़ा हुआ है एक शब्द में A से Z के स्थान पर va

  • @ashiqgafoor5942
    @ashiqgafoor5942 Год назад +1

    Can you please tell me .. what is the difference between Relay module and control module?? Is there any difference

    • @Ansari29
      @Ansari29  Год назад

      Control Module vs Relay Module | Important Video For Fire Alarm Engineer 🔥🔥🔥
      ruclips.net/video/SoGD6UjasQU/видео.html

  • @Muhammadrashid-en6jk
    @Muhammadrashid-en6jk 2 года назад +1

    DEAR SIR KINDLY EXPLANE ABOUT RELAY MODULE . WE NEED CONVENTIONAL PANEL FIRE SIGNAL TO OUR NOTIFIER ADDREASABLE PANEL BY MODULE . WHITCH MODULE WE USE KINDLY EXPLAINE. ALSO CONFIRM ABOUT THIS MODULE. IS THAT OK OR NOT. Notifier FRM-1 Fire Alarm Intelligent Addressable Relay Module

    • @Ansari29
      @Ansari29  2 года назад

      Connect Fire Relay to MM of Notifier panel, Give me some time, I will make one video for you.

    • @Ansari29
      @Ansari29  2 года назад

      Pls share my videos in your company group

  • @suparvideo5793
    @suparvideo5793 28 дней назад +1

    Ansari sar mujhe yah batana bataiye ki aap st3 panel ka model jaise ki ek programming Kiya hua Hai vah short ho jata hai ya kharab ho jata hai uski jagah mein main dusra vahi sem model lagaunga to kya uske liye programming chahie ya nahi

    • @Ansari29
      @Ansari29  26 дней назад

      Est m aapko detector ko add karna hota hai usky serial number k sath....

  • @mohammadazhar7575
    @mohammadazhar7575 3 года назад +2

    Hi mr Ansari will u able to make a video on sprinkler and hydrant system

  • @kaleemi583
    @kaleemi583 8 месяцев назад +1

    Sir smoke detector with souder stand alone me like power supply Kaiser de . With fire Alarm Panel ke

    • @Ansari29
      @Ansari29  8 месяцев назад

      It will automatically activate once get trigger

  • @MrJitu144
    @MrJitu144 3 года назад +1

    👍

    • @Ansari29
      @Ansari29  3 года назад

      Thanks for your comment 🙂

    • @vikasmendhe6077
      @vikasmendhe6077 2 года назад

      Are sir notifire hunnywell ka ditecter ..MM..CR..FIM..waiting circuit daigram bataiye ga

  • @sampathkumar3097
    @sampathkumar3097 2 года назад +1

    Sir please show the programing for fire addressing,,,,,,,,

    • @Ansari29
      @Ansari29  2 года назад

      Sure, I will try

  • @adeelkhan7992
    @adeelkhan7992 24 дня назад

    Power supply se hooter kaise chlayege crm k sath ye batao

  • @LsUnboxing24
    @LsUnboxing24 Год назад +1

    SIR WHAT CAN WE DO IF SIEMENS CERBERUS PRO PANEL INDICATES XNET FAILURE

  • @kashifyar1522
    @kashifyar1522 Год назад +1

    Hello dear sir
    Mere pas do conventional fire alarm penal lagy hyn inim or horen lih dono penal ko centralized krna hy kese hogy plz help

  • @shaheen2033
    @shaheen2033 2 года назад +1

    Can we control 2 nos of A.H.U from 1 contol module ? if not then why ?

    • @Ansari29
      @Ansari29  2 года назад

      I think it works, but may by malfunctioning. I haven't tried yet....you can check & let us know..

  • @mrigankapal828
    @mrigankapal828 3 года назад

    I LOVE YOUR CHANNEL SIR, ITS VERY INFORMATIVE, IS THERE GOOD OPPORTUNITY TO GET JOB AFTER DOING BMS COURSE?

    • @Ansari29
      @Ansari29  3 года назад

      Thanks for your comment.
      Yes BMS system have huge demand in market.

  • @shyamanaresh4715
    @shyamanaresh4715 3 года назад +1

    Sir ji smort monitoring system ke liye zone vise fault and fire signal ka module field me kaise install karega

    • @Ansari29
      @Ansari29  3 года назад

      Mainy istype k system p kaam nhi kiya h but agar kuch knowledge milygi toh video banaoga

  • @natnaeltadesse7360
    @natnaeltadesse7360 3 года назад +1

    I have 2 question
    1. how to connect CM to Gas control panel?
    2. how many devices can supported in a single CM?

    • @Ansari29
      @Ansari29  3 года назад

      1. In GRP panel there is a relay port by using you can control your access control panel
      2. As per standard rule you have to connect only 1 device per CM

    • @natnaeltadesse7360
      @natnaeltadesse7360 3 года назад

      @@Ansari29 Ok, thanks.
      how about VESDA? Can I connect through the GRP input port?

  • @HMSabbir79
    @HMSabbir79 2 года назад

    bhaiya sounder ke liye alag waring chaiye chahie Udhar?

  • @satheeshchandran23
    @satheeshchandran23 11 месяцев назад

    Fault siganl can give through modules or not

  • @deepuctp
    @deepuctp 3 года назад +1

    Sir can you explain simplex fire alarm panel 4100ES wiring.

    • @Ansari29
      @Ansari29  3 года назад

      Ok
      Share me your email id I will send you SLC wiring diagram.

  • @atoz2238
    @atoz2238 3 года назад +1

    Output modular relay ke bare me batao

    • @Ansari29
      @Ansari29  3 года назад

      Output module is same as CM, input module is MM