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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. R

    2 port zone valve question...

    Hello, quick question! I was asked to look at a problem with a hot water system today, however when I got there I found it to be an indirect cylinder that was doing the hot water and a worcester combi doing the heating. I had a quick look round, checked the immersion for power and then noticed...
    • Ryster
    • Thread
    • 2 port forum plumbing question valve zone zone valve
    • Replies: 11
    • Forum: Plumbing Zone
  2. B

    Position of 2 port motorised valve

    Customer has a Baxi Solo runing heating only (hot water is taken care of by a multipoint). The system has no room stat but wants me to add one. As there is no cylinder, is it ok to fit the 2 port motorised valve before the pump? I dont want to change the pump position as there is not enough room.
  3. S

    honeywell 2 port valves heads

    honeywell 2 port motorised valves replacement heads available about 30 of them ! I removed them my self on the contract work I was doing for the council and they are all working ! £15.00 +£3.00 pp
  4. R

    2 port valve

    Hi Friends Bro in law got a probem, heating on in morning, go to work and come home to a sauna after rads on all day. He reckons the 2 port valve faulty (not a bad guess I say). Easy to fix/replace/renew? How easy to fit? I'll do it for him but never done one. Any comments please? Cheers...
  5. J

    Wiring a 2 port motorised valve?

    Hi I've been working in a pub where the heating systems in the pub area and living area where independent of eachother. I have now linked the systems so one boiler does the whole heating system. The size of the boiler etc was fine to take the extra rads. The boiler is fully programmed and...
    • jonfog
    • Thread
    • 2 port boiler central heating system motorised motorised valve system valve wiring
    • Replies: 2
    • Forum: Plumbing Jobs | The Job-board
  6. H

    Will a electrically operated Solenoid do the job of a 2 port Zone Valve?

    I am in the process of connecting my hydronic heating system to my hot water service as a backup means of heating water for baths etc. I have a stainless steel plate heat exchanger installed inside the hot water cylinder which is connected to a pump to circulate water through it. The other...
    • Hobartian
    • Thread
    • 2 port forum job plumbing solenoid valve zone zone valve
    • Replies: 10
    • Forum: Plumbing Zone
  7. F

    Danfoss shoe or paddle 2 port valve

    Question has probably been asked before, but what are the operational differences between shoes or paddles in a (Danfoss)2 port valve. Does one type have an edge over the other. The only difference apart from flow direction, that I can see is in the Danfoss blurb in that the paddle type has a...
  8. D

    2 port zone valve - 2 port motorised valve

    whats the differance, apart from price..?
    • desrob
    • Thread
    • 2 port forum motorised motorised valve plumbing valve zone zone valve
    • Replies: 10
    • Forum: Plumbing Zone
  9. E

    Does one plumb in a 2 port zone valve so that it can be removed easily in future?

    I've got a 2 port Sunvic 5203 5 wire zone valve with a very stiff spindle which has been installed 20+ years. I plan to drain the system down & cut it out and replace it with a Honeywell V4043H1056 zone valve. From reading the forum it seems that the Honeywell valve is the one to go for. What's...
    • Evo99
    • Thread
    • 2 port compression coupling forum future joint movement plumb plumbing removed valve zone zone valve
    • Replies: 10
    • Forum: Plumbing Zone
  10. S

    3 wire 2 port valve problems.

    Ive been to a range unvented cylinder tonight and the hot water is getting too hot, 70 deg C and its the two port valve at fault which is a 3 wire Range 2PV. My question is, can i replace it with the lovely 5 wire honeywell 2PV i have at home and just wire the live neutral and earth same as the...
  11. P

    2 port and 3 port mid on same system

    come accross a system (unvented) that has a 2 port to control hot water and a 3 port on the heating side why this configuration of a 3 port? if zoneing off 2 heating zones then 2x 2port valves on heating would be better to use. just dont understand why that set up.
  12. D

    2 Port & 3 Port valve /How do I wire??

    Hi guys I’m new to all of this, any help will be appreciated. I was called out to a job at work today, The system was a pressurised system. The tank was a "ergo" (cheaper version of a Megaflow) tried calling the company, they seem to be nonexistent now. The boiler in the property is a “Baxi...
  13. M

    myson mpe222 2 port valve

    just finished a job there, zoning a fellas heating and hotwater into 3 zones, the 2 28mm valves for the heating are working ok but the 22m valve for the hot water valve is not working. there is no red light on the acutator for the hot water valve, but when i push the valve lever over...
    • mark_mc
    • Thread
    • 2 port 2 port valve 28mm boiler cable central heating system cylinder dhw electricians head hot water hotwater job myson plumber power switch test valve valves water zones
    • Replies: 7
    • Forum: Plumbing Jobs | The Job-board
  14. D

    Honeywell 3 way valve

    I have a honeywell 3 way valve on my heating system that screams like a wild banshee when the heating comes on. The longer you leave it on, the louder the scream. Having removed the casing of the head, I can see a little wear/ damage to one of the cogs. How would I remove the valve, with out...
    • downdraft
    • Thread
    • 2 port 2 port valve brass damage drain fitting flow flush head heating honeywell inside pipe pressure price remove rubber stainless system valve valves water work
    • Replies: 7
    • Forum: Plumbing Jobs | The Job-board
  15. B

    horstmann 2 port motorised valves

    I have 2 valves of this type fitted in my CH system and both motors have failed. One was fitted in the airing cupboard in free air and the other in a small enclosure with no ambient air circulation. One failed after about 18 months and the other in less than a year. Looking at other posts on...
    • blestowe
    • Thread
    • 2 port cheap circulation free honeywell hot hot water installation motorised motorised valve motorised valves pipes sink system tee valve valves water
    • Replies: 4
    • Forum: Plumbing Jobs | The Job-board
  16. T

    Zoning

    Is everyone up to speed on the new zoning regs for heating
  17. Z

    2 Port Zone Valve question

    Hi all, I have been to look at a job today where a 2 port zone valve has packe up but it does work manually. Am i able to only to change just part of this zone vale without taking the body from the pipes? Also the main cable that comes from the valve is onlt about 20cm long and goes into a...
    • Zammo1001
    • Thread
    • 2 port boiler cable central heating system costs drain forum free head job manual metal motorised valves pipes plug plumbing power pump question system tee valve valves water work zone zone valve
    • Replies: 20
    • Forum: Plumbing Zone
  18. I

    Faulty 2 port valve

    In another thread doitmyself gave me helpful advice on how to check the wiring on my faulty Tower 2 port valve. All feeds seem fine but the valve doesn't fully close and it doesn't always switch the pump and boiler on. Doitmyself suggested taking the actuator off and checking that the valve...
    • I am bonkers
    • Thread
    • 2 port 2 port valve boiler cleaning faulty industry local plumber plumber pump switch valve water work
    • Replies: 6
    • Forum: Plumbing Jobs | The Job-board
  19. J

    2 port valve

    Morning all, I have a standard CH/HW system with 2 x 2 port valves for HW & CH. Now, the valve for the HW seems to be stuck in the open position, as when the programmer has everything switched off, the pump continues to run and occasionally the boiler will fire up, again, when everything...
    • Jason.S
    • Thread
    • 2 port 2 port valve boiler head inside power price problem pump safe safety switch system test valve valves
    • Replies: 3
    • Forum: Plumbing Jobs | The Job-board
  20. H

    HW 2 port not opening when calling for heat

    i have a 2 port honeywell valve that does not open or fire boiler when programmer is calling and stat is. the valve moves manually and ive changed the head of the valve could it be a programmer fault?
    • henrymerrington
    • Thread
    • 2 port boiler cable calling cylinder head heat honeywell opening power remove supply test valve
    • Replies: 4
    • Forum: Plumbing Jobs | The Job-board
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