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2 port

The PS/2 port is a 6-pin mini-DIN connector used for connecting keyboards and mice to a PC compatible computer system. Its name comes from the IBM Personal System/2 series of personal computers, with which it was introduced in 1987. The PS/2 mouse connector generally replaced the older DE-9 RS-232 "serial mouse" connector, while the PS/2 keyboard connector replaced the larger 5-pin/180° DIN connector used in the IBM PC/AT design. The PS/2 keyboard port is electrically and logically identical to the IBM AT keyboard port, differing only in the type of electrical connector used. The PS/2 platform introduced a second port with the same design as the keyboard port for use to connect a mouse; thus the PS/2-style keyboard and mouse interfaces are electrically similar and employ the same communication protocol. However, unlike the otherwise similar Apple Desktop Bus connector used by Apple, a given system's keyboard and mouse port may not be interchangeable since the two devices use different sets of commands and the device drivers generally are hard-coded to communicate with each device at the address of the port that is conventionally assigned to that device. (That is, keyboard drivers are written to use the first port, and mouse drivers are written to use the second port.)

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  1. B

    Best 2 port 22mm zone valves normally closed

    So heres the story, my own boiler was replaced a year ago. All 4 zone valves were replaced at my suggestion..... for reliability reasons (they were 20 years old) - Now the motor has conked out on one of the new ones in 15 months. So before some random stuff gets put in - I want a 20 year life...
  2. A

    Price to change a Honeywell 2 port actuator

    Hi Had a request from a customer to change the actuator on their 2 port valve. Apparently already been diagnosed, they get HW if they keep it in the manual position, I said I prefer to change the whole thing but will obvioulsy take longer, they said just change the actuator. - Fine by me, i'm...
  3. D

    2 port valves stuck open

    Hi, can anyone advice me what to do with 2 stuck open port valves. The handles/switches are really loose. Put WD40 on them, tapped them but can't get them to work. Is this the type that can be taken off and changed or is it a drain situation? Any help would great, thanks.
  4. M

    2 port valve failure

    I have an S Plan heating system at home with upstairs and downstairs split as 2 zones. The downstairs heating stopped working recently, but all was still ok with the hot water and the upstairs heating. It appears that the 2 port valve on the downstairs zone has failed, as when the system calls...
    • manocheese
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    • 2 port 2 port valve downstairs failure heating insulation manual valve
    • Replies: 4
    • Forum: Plumbing Jobs | The Job-board
  5. C

    sealed system 2 port issue

    My heating system is a sealed system with gas fired greenstar i24 serving a hot water cylinder and rads via a 2no. 2 port valve arrangement. The greenstar was fitted 3yrs+ ago and ever since I have had a bang noise when the heating is switched off (either via stat or by the timer) the previous...
    • csk423
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    • 2 port boiler bypass central heating system issue sealed sealed system system valve water
    • Replies: 5
    • Forum: Plumbing Jobs | The Job-board
  6. A

    2 Port valve + 3 Port mid position valve on same setup

    Hey everyone, Had some work done to convert our hot water system to pressurised one. Well the chap installed a new 2 port valve and kept the original 3 port mid position valve in. To me that is a pointless thing to do as to me as surely its two valves in series to one another? The...
    • allesclar
    • Thread
    • 2 port 2 port valve 3 port mid position normal position setup unvented valve
    • Replies: 34
    • Forum: Plumbing Jobs | The Job-board
  7. A

    drayton 2 port valves

    Hi all, Aware may be going over old ground again but it's a system with 2 2 port valves - one for HW and other for heating - ( oil fired regular boiler) . Customer complaining boiler fires up when not required. Assume it is a fault with one of the valves - also if boiler on for hot water...
  8. townfanjon

    honeywell 2 port

    replaced a honeywell 2 - port actuator today, the valve/blackball bit moved very easily so I didn't change the valve body. strangely I only replaced the actuator off the original valve around 2 years ago. The custard had the system put in approx. 6 years ago, so in 6 years we are now on actuator...
  9. J

    Y Plan system extended with additional pump and 2 port valve for UFH

    I had a standard Y plan system which has now been added to to provide UFH to an extension. The additions are a T off the hot feed into a 2 port valve into a 22mm thermostatic valve and then into a grundfos pump. This then pumps round the UFH with the return flowing into the 22mm thermostatic...
  10. B

    Fixing the wiring for a 2x 2 port heating system with Boss controls

    Hello there, Another plumbing conundrum for you to set your minds to. My mates have just bought a house and the lovely sellers have left the heating/hot water in a pretty naff state. The system is a 2x 2 port system. The boiler is an old Potterson Netaheat mk2. The programmer is a Boss therm...
  11. carrpaul

    switchmaster 2 port

    hi there dose any one know the wires colours for changing switchmaster 2 port to honeywell v4043h switchmaster colours i am not sure on are yellow red white
  12. M

    can you get reverse circulation on a 2 2 port heating system in a bungalow?

    I was installing a heating system where I was running the hot water circuit as the last T. He asked me why I was doing it and then said that that was only applicable if it is thermo syhoning and on a 3 port valve. I told him it had nothing to do with thermo syphonng but the pump pushing it. Does...
  13. B

    Tandem 2 port valves?

    Hi chaps. Any idea why the installer would do this? Both NC. Cheers
  14. B

    No power to 2 port valve

    Hi guys, still trying to get my head around the wiring on s plan and y plan systems got called to a job yesterday, its an unvented cylinder and don't have my ticket for unvented so need to know if they need to get someone in that has there unvented ticket anywsy prob is, the whole system is...
  15. M

    Satchwell 5 2 port power on power off valve

    Need to replace on of these and as they are no longer available is their a wiring combination to make a modern 2 port valve work on this system? Any advice most welcome
  16. B

    Stuck 2 port valve versus boiler high limit stat....

    At a job replacing a cylinder and he mentions the boiler kept running even though the programmer wasnt calling. Apparently some history of the CH 2PV sticking on. I found it under some floorboards....nice. So even with the actuator closed, the switch is ON and therefore running the boiler (there...
    • Bunker
    • Thread
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    • Replies: 10
    • Forum: Plumbing Jobs | The Job-board
  17. N

    EPH 2 port valves

    Morning guys, fitted two of the above yesterday without fuss until I refitted the actuators, then noticed that one of the manual override switch doesn't fully return to auto position when released from manual, works perfectly fine when not fitted to the valve body. Swapped them around and tried...
  18. N

    EPH V222D 2 port valve vertical installation

    Evening guys hope your well ... Does anyone know if there is an issue installing the above on vertical pipework? Instructions only mention horizontal installation which has thrown me a bit, would not have thought there would be an issue but thought I'd check with you guys. cheers
  19. D

    2 port

    is the connection made when you use manual lever on valve,or does it energise and take it about 10mm to micro switch,i've took the top of this one and when i use lever it's about 10mm short from micro switch,when iv'e used 2 port in the past the manual lever opens valve,but is it energised that...
  20. B

    28mm 2 port valve / heat pack

    anyone seen these on special anywhere ?
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